diff --git a/.agents/skills/quarterly-ladder-analysis/references/bots.txt b/.agents/skills/quarterly-ladder-analysis/references/bots.txt
index 8c9f084..e72b8f9 100644
--- a/.agents/skills/quarterly-ladder-analysis/references/bots.txt
+++ b/.agents/skills/quarterly-ladder-analysis/references/bots.txt
@@ -35,6 +35,7 @@ buildbot
 agentfu
 kenzie-agent
 reidbaker-agent
+renzo-olivares-agent
 google-admin
 google-admin-automation-1
 google-admin-automation-2
diff --git a/.agents/skills/quarterly-ladder-analysis/references/known_maintainers.txt b/.agents/skills/quarterly-ladder-analysis/references/known_maintainers.txt
new file mode 100644
index 0000000..ab06217
--- /dev/null
+++ b/.agents/skills/quarterly-ladder-analysis/references/known_maintainers.txt
@@ -0,0 +1,8 @@
+# These are known maintainers, listed here by exception due to a sync issue with internal tooling and GitHub.
+CarlosMendonca
+LouiseHsu
+abdallahshaban557
+andywolff
+gaaclarke
+gmackall
+jesswrd
diff --git a/.github/workflows/validate.yml b/.github/workflows/validate.yml
index e01b250..6716ecf 100644
--- a/.github/workflows/validate.yml
+++ b/.github/workflows/validate.yml
@@ -39,6 +39,12 @@ jobs:
       - name: Analyze Dart code
         run: dart analyze --fatal-infos
 
+      - name: Validate contributors.yaml
+        run: dart run tool/validate_roster.dart
+
+      - name: Verify ROSTER.md and EMERITUS.md are in sync
+        run: dart run tool/generate_roster.dart --check
+
       - name: Run unit test suite
         run: dart test
 
diff --git a/EMERITUS.md b/EMERITUS.md
new file mode 100644
index 0000000..6d1e161
--- /dev/null
+++ b/EMERITUS.md
@@ -0,0 +1,65 @@
+# Dasher Emeritus
+
+> [!IMPORTANT]
+> **Pending Q4 Audit:** No contributor roles or organization memberships have been changed yet. The Emeritus transitions listed below are pending the Q4 audit, which will be subject to a 30-day community review period before being finalized.
+
+This directory honors **Dasher Emeritus** alumni—former Flutter Reviewers, Committers, and Maintainers who previously held roles on the contributor ladder and have stepped back from active contribution (< 10 contributions over the preceding 12 months).
+
+To maintain repository security, Dasher Emeriti do not remain members of the `flutter` GitHub organization. Instead, their contributions are recognized here, and they retain access to Flutter contributor channels on Discord (including `#hidden-chat`) and the announcement-only `flutter-contributors` Google Group (for project announcements and calendar invites to our recurring Flutter Contributor Roundtable and the Dash Forum, where contributors can present and get feedback on their [RFCs](https://github.com/flutter/rfc); the registration form is pinned in `#hidden-chat` on Discord) so they can stay in touch and more easily ramp back up onto the project if and when they choose to return.
+
+Returning Emeriti who resume contributing are automatically identified during quarterly reviews (where they can reply directly on the public tracking issue). For off-cycle reinstatement, because creating new issues and pull requests in `flutter/contributors` is restricted to organization members (`collaborators`), returning Emeriti can reach out in `#hidden-chat` on Discord (or to an active organization member) to have an active org member sponsor and open a [Dasher Emeritus Reinstatement request](.github/ISSUE_TEMPLATE/2_emeritus_reinstatement.yml) on their behalf (where they can also share an updated Discord username if needed). See [docs/LADDER.md](docs/LADDER.md) for details.
+
+> [!NOTE]
+> This file is automatically generated from `data/contributors.yaml`.
+> To update, edit `data/contributors.yaml` and run `dart run tool/generate_roster.dart`.
+
+## Honored Alumni
+
+[@0xZOne](https://github.com/0xZOne) • [@324mao](https://github.com/324mao) • [@a14n](https://github.com/a14n) • [@aaron-sf](https://github.com/aaron-sf)
+[@adarshprabhu](https://github.com/adarshprabhu) • [@adicahyono](https://github.com/adicahyono) • [@akrwb](https://github.com/akrwb) • [@albertodev01](https://github.com/albertodev01)
+[@alestiago](https://github.com/alestiago) • [@AlexV525](https://github.com/AlexV525) • [@allisonryan0002](https://github.com/allisonryan0002) • [@almasryalyoum](https://github.com/almasryalyoum)
+[@alxp1982](https://github.com/alxp1982) • [@AnnaPS](https://github.com/AnnaPS) • [@antonellof](https://github.com/antonellof) • [@ANTONINEUTRON](https://github.com/ANTONINEUTRON)
+[@AntonyKiragu](https://github.com/AntonyKiragu) • [@atrope](https://github.com/atrope) • [@AustinGTI](https://github.com/AustinGTI) • [@AyushBherwani1998](https://github.com/AyushBherwani1998)
+[@azchohfi](https://github.com/azchohfi) • [@bartekpacia](https://github.com/bartekpacia) • [@BerkSpar](https://github.com/BerkSpar) • [@bernaferrari](https://github.com/bernaferrari)
+[@brianegan](https://github.com/brianegan) • [@bruno-garcia](https://github.com/bruno-garcia) • [@bselwe](https://github.com/bselwe) • [@btobin](https://github.com/btobin)
+[@budikhafiKLY](https://github.com/budikhafiKLY) • [@burakkasikci](https://github.com/burakkasikci) • [@CareF](https://github.com/CareF) • [@chenglu](https://github.com/chenglu)
+[@chinmoy12c](https://github.com/chinmoy12c) • [@chriscraws](https://github.com/chriscraws) • [@cityxsuperapp](https://github.com/cityxsuperapp) • [@CoffeeDevUK](https://github.com/CoffeeDevUK)
+[@ColdPaleLight](https://github.com/ColdPaleLight) • [@collinjackson](https://github.com/collinjackson) • [@dam-ease](https://github.com/dam-ease) • [@danagbemava-nc](https://github.com/danagbemava-nc)
+[@darshankawar](https://github.com/darshankawar) • [@dclark-disney](https://github.com/dclark-disney) • [@diarmaidlindsay](https://github.com/diarmaidlindsay) • [@diegogawenda](https://github.com/diegogawenda)
+[@diegoveloper](https://github.com/diegoveloper) • [@djol](https://github.com/djol) • [@dominikIncibit](https://github.com/dominikIncibit) • [@eda-nagao](https://github.com/eda-nagao)
+[@eggfly](https://github.com/eggfly) • [@egoe](https://github.com/egoe) • [@Ehesp](https://github.com/Ehesp) • [@emma-roudabush-disney](https://github.com/emma-roudabush-disney)
+[@emrebuyukozkan](https://github.com/emrebuyukozkan) • [@ened](https://github.com/ened) • [@enzoftware](https://github.com/enzoftware) • [@erickzanardo](https://github.com/erickzanardo)
+[@eseidel](https://github.com/eseidel) • [@exaby73](https://github.com/exaby73) • [@farshad1489](https://github.com/farshad1489) • [@felangel](https://github.com/felangel)
+[@FirentisTFW](https://github.com/FirentisTFW) • [@FlutterIssues](https://github.com/FlutterIssues) • [@FXschwartz](https://github.com/FXschwartz) • [@gastonliz](https://github.com/gastonliz)
+[@gianfrancopapa](https://github.com/gianfrancopapa) • [@gnprice](https://github.com/gnprice) • [@guoguo338](https://github.com/guoguo338) • [@hamdikahloun](https://github.com/hamdikahloun)
+[@harri35](https://github.com/harri35) • [@hbatagelo](https://github.com/hbatagelo) • [@helinanever](https://github.com/helinanever) • [@hgraceb](https://github.com/hgraceb)
+[@HidenoriMatsubayashi](https://github.com/HidenoriMatsubayashi) • [@hillelcoren](https://github.com/hillelcoren) • [@Hiroaki-Kanai](https://github.com/Hiroaki-Kanai) • [@horiaciu](https://github.com/horiaciu)
+[@IanSimpson](https://github.com/IanSimpson) • [@ihorkozar](https://github.com/ihorkozar) • [@irmasantoso](https://github.com/irmasantoso) • [@itsjen](https://github.com/itsjen)
+[@ja-dfir](https://github.com/ja-dfir) • [@Jan-Stepien](https://github.com/Jan-Stepien) • [@jcollins-disney](https://github.com/jcollins-disney) • [@JErazo7](https://github.com/JErazo7)
+[@jeroen-meijer](https://github.com/jeroen-meijer) • [@Jhon-Aires](https://github.com/Jhon-Aires) • [@jingshao-code](https://github.com/jingshao-code) • [@jnschulze](https://github.com/jnschulze)
+[@jomblocoder](https://github.com/jomblocoder) • [@jorgecoca](https://github.com/jorgecoca) • [@jpnurmi](https://github.com/jpnurmi) • [@JsouLiang](https://github.com/JsouLiang)
+[@Justian-SopraSteria](https://github.com/Justian-SopraSteria) • [@kaiceyd](https://github.com/kaiceyd) • [@kenvandine](https://github.com/kenvandine) • [@kevinburns426](https://github.com/kevinburns426)
+[@kinla004](https://github.com/kinla004) • [@Kirpal](https://github.com/Kirpal) • [@kmillikin](https://github.com/kmillikin) • [@kokoro-team](https://github.com/kokoro-team)
+[@kondoakio](https://github.com/kondoakio) • [@KristinBi](https://github.com/KristinBi) • [@kwg4](https://github.com/kwg4) • [@laramartin](https://github.com/laramartin)
+[@leoafarias](https://github.com/leoafarias) • [@linxuebin1990](https://github.com/linxuebin1990) • [@LinXunFeng](https://github.com/LinXunFeng) • [@lucavenir](https://github.com/lucavenir)
+[@luckysmg](https://github.com/luckysmg) • [@MacarenaSantos](https://github.com/MacarenaSantos) • [@magicianA](https://github.com/magicianA) • [@maheshj01](https://github.com/maheshj01)
+[@martinduva](https://github.com/martinduva) • [@MaruQuarky](https://github.com/MaruQuarky) • [@marwfair](https://github.com/marwfair) • [@matiasleyba](https://github.com/matiasleyba)
+[@matsuda-shota](https://github.com/matsuda-shota) • [@matthew-carroll](https://github.com/matthew-carroll) • [@matthewshahi](https://github.com/matthewshahi) • [@mattmartelnz](https://github.com/mattmartelnz)
+[@MauriPastorini](https://github.com/MauriPastorini) • [@maxp89](https://github.com/maxp89) • [@mchudy](https://github.com/mchudy) • [@Menshoz](https://github.com/Menshoz)
+[@mhadaily](https://github.com/mhadaily) • [@milezabaleta](https://github.com/milezabaleta) • [@miquelbeltran](https://github.com/miquelbeltran) • [@moffatman](https://github.com/moffatman)
+[@MrUnfunny](https://github.com/MrUnfunny) • [@msangalli](https://github.com/msangalli) • [@mvanbeusekom](https://github.com/mvanbeusekom) • [@nikosportolos](https://github.com/nikosportolos)
+[@nirunirosha401-personal](https://github.com/nirunirosha401-personal) • [@noboru-i](https://github.com/noboru-i) • [@nt4f04uNd](https://github.com/nt4f04uNd) • [@okursoftware](https://github.com/okursoftware)
+[@omartinma](https://github.com/omartinma) • [@omatt](https://github.com/omatt) • [@pedromassango](https://github.com/pedromassango) • [@pingbird](https://github.com/pingbird)
+[@PoojaB26](https://github.com/PoojaB26) • [@QMAshfaqAli](https://github.com/QMAshfaqAli) • [@rahulan](https://github.com/rahulan) • [@rajayogan](https://github.com/rajayogan)
+[@renefloor](https://github.com/renefloor) • [@Rexios80](https://github.com/Rexios80) • [@rzambroni](https://github.com/rzambroni) • [@Salakar](https://github.com/Salakar)
+[@scarletteliza](https://github.com/scarletteliza) • [@scutlight](https://github.com/scutlight) • [@SenseiMinimal](https://github.com/SenseiMinimal) • [@shirbayat](https://github.com/shirbayat)
+[@simpson-peter](https://github.com/simpson-peter) • [@slightfoot](https://github.com/slightfoot) • [@SofiaRey](https://github.com/SofiaRey) • [@spideythewebhead](https://github.com/spideythewebhead)
+[@spjass](https://github.com/spjass) • [@spratt-disney](https://github.com/spratt-disney) • [@ssmitienko](https://github.com/ssmitienko) • [@sushanthmshetty](https://github.com/sushanthmshetty)
+[@swavkulinski](https://github.com/swavkulinski) • [@Swiftaxe](https://github.com/Swiftaxe) • [@tanercc](https://github.com/tanercc) • [@tcannon-disney](https://github.com/tcannon-disney)
+[@tfabacher-dp](https://github.com/tfabacher-dp) • [@tgucio](https://github.com/tgucio) • [@thekorn](https://github.com/thekorn) • [@TimoPieti](https://github.com/TimoPieti)
+[@tomgilder](https://github.com/tomgilder) • [@tpiaggio](https://github.com/tpiaggio) • [@trevorplant](https://github.com/trevorplant) • [@tsurumotokdi](https://github.com/tsurumotokdi)
+[@udayon](https://github.com/udayon) • [@vaind](https://github.com/vaind) • [@valentinallavayol](https://github.com/valentinallavayol) • [@Vanethos](https://github.com/Vanethos)
+[@vickyduran](https://github.com/vickyduran) • [@wakita181009](https://github.com/wakita181009) • [@wangying3426](https://github.com/wangying3426) • [@werainkhatri](https://github.com/werainkhatri)
+[@whesse](https://github.com/whesse) • [@workerbee22](https://github.com/workerbee22) • [@wprater](https://github.com/wprater) • [@xm0128](https://github.com/xm0128)
+[@xu-baolin](https://github.com/xu-baolin) • [@YeungKC](https://github.com/YeungKC) • [@yiiim](https://github.com/yiiim) • [@ymgn-dev](https://github.com/ymgn-dev)
+[@zhongwuzw](https://github.com/zhongwuzw) • [@Zudah228](https://github.com/Zudah228)
diff --git a/ROSTER.md b/ROSTER.md
new file mode 100644
index 0000000..d3624c6
--- /dev/null
+++ b/ROSTER.md
@@ -0,0 +1,110 @@
+# Contributor Roster
+
+> [!IMPORTANT]
+> **Pending Q4 Audit:** No contributor roles or permissions have been changed yet. The placements listed below are initial baseline assignments pending the Q4 audit, which will be subject to a 30-day community review period before being finalized.
+
+This directory lists active Flutter Contributor Ladder members.
+Honorary alumni who have stepped back from active contribution and exited the GitHub organization are listed in [EMERITUS.md](EMERITUS.md).
+Governance details and tier qualifications are specified in [docs/LADDER.md](docs/LADDER.md).
+
+> [!NOTE]
+> This file is automatically generated from `data/contributors.yaml`.
+> To update, edit `data/contributors.yaml` and run `dart run tool/generate_roster.dart`.
+
+## Maintainers (`@flutter/maintainers`)
+
+Maintainers hold GitHub Write permissions and organization moderation privileges, and belong to `@flutter/maintainers` (a child team of `@flutter/flutter-hackers`).
+
+[@aam](https://github.com/aam) • [@abdallahshaban557](https://github.com/abdallahshaban557) • [@alexmarkov](https://github.com/alexmarkov) • [@amcasari](https://github.com/amcasari)
+[@ananci](https://github.com/ananci) • [@anderdobo](https://github.com/anderdobo) • [@andrewkolos](https://github.com/andrewkolos) • [@andywolff](https://github.com/andywolff)
+[@another-rex](https://github.com/another-rex) • [@apwilson](https://github.com/apwilson) • [@arbreng](https://github.com/arbreng) • [@athomas](https://github.com/athomas)
+[@b-luk](https://github.com/b-luk) • [@bdero](https://github.com/bdero) • [@biggs0125](https://github.com/biggs0125) • [@bkonyi](https://github.com/bkonyi)
+[@bparrishMines](https://github.com/bparrishMines) • [@brianquinlan](https://github.com/brianquinlan) • [@bwilkerson](https://github.com/bwilkerson) • [@camsim99](https://github.com/camsim99)
+[@CarlosMendonca](https://github.com/CarlosMendonca) • [@caroqliu](https://github.com/caroqliu) • [@catharp](https://github.com/catharp) • [@cbracken](https://github.com/cbracken)
+[@chandarrengoog](https://github.com/chandarrengoog) • [@chaselatta](https://github.com/chaselatta) • [@chingjun](https://github.com/chingjun) • [@chloestefantsova](https://github.com/chloestefantsova)
+[@chrisraygill](https://github.com/chrisraygill) • [@ChristianEdwardPadilla](https://github.com/ChristianEdwardPadilla) • [@chunhtai](https://github.com/chunhtai) • [@cj-radcliff](https://github.com/cj-radcliff)
+[@cligh](https://github.com/cligh) • [@conooi](https://github.com/conooi) • [@cpsloal](https://github.com/cpsloal) • [@craiglabenz](https://github.com/craiglabenz)
+[@danielleon-cmd](https://github.com/danielleon-cmd) • [@DanTup](https://github.com/DanTup) • [@danxorzum](https://github.com/danxorzum) • [@davidmorgan](https://github.com/davidmorgan)
+[@DBowen33](https://github.com/DBowen33) • [@dcharkes](https://github.com/dcharkes) • [@di](https://github.com/di) • [@Dipakkumarjena](https://github.com/Dipakkumarjena)
+[@ditman](https://github.com/ditman) • [@dkbharti-glitch](https://github.com/dkbharti-glitch) • [@dkwingsmt](https://github.com/dkwingsmt) • [@domesticmouse](https://github.com/domesticmouse)
+[@dsmcl](https://github.com/dsmcl) • [@dustingreen](https://github.com/dustingreen) • [@eieio](https://github.com/eieio) • [@elliette](https://github.com/elliette)
+[@emckean](https://github.com/emckean) • [@ericwindmill](https://github.com/ericwindmill) • [@essjay05](https://github.com/essjay05) • [@ethanalee-work](https://github.com/ethanalee-work)
+[@everyplace](https://github.com/everyplace) • [@eyebrowsoffire](https://github.com/eyebrowsoffire) • [@flar](https://github.com/flar) • [@flutter-zl](https://github.com/flutter-zl)
+[@gaaclarke](https://github.com/gaaclarke) • [@GemmaJAy](https://github.com/GemmaJAy) • [@gitrey](https://github.com/gitrey) • [@gmackall](https://github.com/gmackall)
+[@goderbauer](https://github.com/goderbauer) • [@grouma](https://github.com/grouma) • [@gspencergoog](https://github.com/gspencergoog) • [@guidezpl](https://github.com/guidezpl)
+[@h9jiang](https://github.com/h9jiang) • [@hannah-hyj](https://github.com/hannah-hyj) • [@harryterkelsen](https://github.com/harryterkelsen) • [@helin24](https://github.com/helin24)
+[@hellohuanlin](https://github.com/hellohuanlin) • [@Hixie](https://github.com/Hixie) • [@ievdokdm](https://github.com/ievdokdm) • [@iinozemtsev](https://github.com/iinozemtsev)
+[@InMatrix](https://github.com/InMatrix) • [@itsjustkevin](https://github.com/itsjustkevin) • [@jacob314](https://github.com/jacob314) • [@jacobsimionato](https://github.com/jacobsimionato)
+[@jaeheon](https://github.com/jaeheon) • [@jakemac53](https://github.com/jakemac53) • [@jalseth](https://github.com/jalseth) • [@jensjoha](https://github.com/jensjoha)
+[@jesskuras](https://github.com/jesskuras) • [@jesswrd](https://github.com/jesswrd) • [@jiahaog](https://github.com/jiahaog) • [@jmagman](https://github.com/jmagman)
+[@joefspiro](https://github.com/joefspiro) • [@johnmccutchan](https://github.com/johnmccutchan) • [@johnniwinther](https://github.com/johnniwinther) • [@johnpryan](https://github.com/johnpryan)
+[@johnsonmh](https://github.com/johnsonmh) • [@jokerttu](https://github.com/jokerttu) • [@jonasfj](https://github.com/jonasfj) • [@jonathanmetzman](https://github.com/jonathanmetzman)
+[@josemontespg](https://github.com/josemontespg) • [@joshualitt](https://github.com/joshualitt) • [@jq129398](https://github.com/jq129398) • [@jrwang](https://github.com/jrwang)
+[@jtmcdole](https://github.com/jtmcdole) • [@juan-mora-google](https://github.com/juan-mora-google) • [@justinmc](https://github.com/justinmc) • [@jwill](https://github.com/jwill)
+[@jwren](https://github.com/jwren) • [@jyameo](https://github.com/jyameo) • [@kallentu](https://github.com/kallentu) • [@keertip](https://github.com/keertip)
+[@kentnguyen99](https://github.com/kentnguyen99) • [@kenzieschmoll](https://github.com/kenzieschmoll) • [@kevmoo](https://github.com/kevmoo) • [@kevya-google](https://github.com/kevya-google)
+[@khanhnwin](https://github.com/khanhnwin) • [@kkboateng](https://github.com/kkboateng) • [@knopp](https://github.com/knopp) • [@lamek](https://github.com/lamek)
+[@leafpetersen](https://github.com/leafpetersen) • [@liamappelbe](https://github.com/liamappelbe) • [@loic-sharma](https://github.com/loic-sharma) • [@LongCatIsLooong](https://github.com/LongCatIsLooong)
+[@LouiseHsu](https://github.com/LouiseHsu) • [@mariamhas](https://github.com/mariamhas) • [@Markzipan](https://github.com/Markzipan) • [@MaryaBelanger](https://github.com/MaryaBelanger)
+[@maryx](https://github.com/maryx) • [@mattkae](https://github.com/mattkae) • [@mbcorona](https://github.com/mbcorona) • [@mboetger](https://github.com/mboetger)
+[@mbrase](https://github.com/mbrase) • [@mdebbar](https://github.com/mdebbar) • [@michaelkedar](https://github.com/michaelkedar) • [@mikaelkomu](https://github.com/mikaelkomu)
+[@mit-mit](https://github.com/mit-mit) • [@mkustermann](https://github.com/mkustermann) • [@mmohankrishna-lab](https://github.com/mmohankrishna-lab) • [@mosuem](https://github.com/mosuem)
+[@mraleph](https://github.com/mraleph) • [@munificent](https://github.com/munificent) • [@muralikrishmt](https://github.com/muralikrishmt) • [@MuthuGCodes](https://github.com/MuthuGCodes)
+[@nan-yu](https://github.com/nan-yu) • [@natebosch](https://github.com/natebosch) • [@nickyringland](https://github.com/nickyringland) • [@nshahan](https://github.com/nshahan)
+[@nuritzi](https://github.com/nuritzi) • [@okorohelijah](https://github.com/okorohelijah) • [@oliverchang](https://github.com/oliverchang) • [@omerlevran46](https://github.com/omerlevran46)
+[@parlough](https://github.com/parlough) • [@paul-geoghegan](https://github.com/paul-geoghegan) • [@peixinli](https://github.com/peixinli) • [@pennzht](https://github.com/pennzht)
+[@Piinks](https://github.com/Piinks) • [@pjkammer](https://github.com/pjkammer) • [@polina-c](https://github.com/polina-c) • [@pq](https://github.com/pq)
+[@precision](https://github.com/precision) • [@preethi0228-git](https://github.com/preethi0228-git) • [@puneetkukreja98](https://github.com/puneetkukreja98) • [@QuncCccccc](https://github.com/QuncCccccc)
+[@ranbeuer](https://github.com/ranbeuer) • [@redbrogdon](https://github.com/redbrogdon) • [@reidbaker](https://github.com/reidbaker) • [@renaudd](https://github.com/renaudd)
+[@renyou](https://github.com/renyou) • [@Renzo-Olivares](https://github.com/Renzo-Olivares) • [@rmacnak-google](https://github.com/rmacnak-google) • [@robert-ancell](https://github.com/robert-ancell)
+[@rodydavis](https://github.com/rodydavis) • [@ronit-cloudsufi](https://github.com/ronit-cloudsufi) • [@rspier](https://github.com/rspier) • [@Rusino](https://github.com/Rusino)
+[@samuli-codemate](https://github.com/samuli-codemate) • [@saurabh-mirajkar](https://github.com/saurabh-mirajkar) • [@Saviq](https://github.com/Saviq) • [@scheglov](https://github.com/scheglov)
+[@schultek](https://github.com/schultek) • [@sethladd](https://github.com/sethladd) • [@sfshaza2](https://github.com/sfshaza2) • [@shanecglass](https://github.com/shanecglass)
+[@sigmundch](https://github.com/sigmundch) • [@sigurdm](https://github.com/sigurdm) • [@snikiche](https://github.com/snikiche) • [@sokoloff06](https://github.com/sokoloff06)
+[@srawlins](https://github.com/srawlins) • [@srujzs](https://github.com/srujzs) • [@sstrickl](https://github.com/sstrickl) • [@stef-luo](https://github.com/stef-luo)
+[@stereotype441](https://github.com/stereotype441) • [@stevemessick](https://github.com/stevemessick) • [@studgeek](https://github.com/studgeek) • [@suertreus](https://github.com/suertreus)
+[@suryaKommana2662](https://github.com/suryaKommana2662) • [@szakarias](https://github.com/szakarias) • [@tarobins](https://github.com/tarobins) • [@tarrinneal](https://github.com/tarrinneal)
+[@tasnim-khan](https://github.com/tasnim-khan) • [@thagomizer](https://github.com/thagomizer) • [@thkim1011](https://github.com/thkim1011) • [@timothyhoang-google](https://github.com/timothyhoang-google)
+[@twerske](https://github.com/twerske) • [@utopicnarwhal](https://github.com/utopicnarwhal) • [@uysalere](https://github.com/uysalere) • [@vashworth](https://github.com/vashworth)
+[@victogomez-cs](https://github.com/victogomez-cs) • [@victorsanni](https://github.com/victorsanni) • [@vivahome2](https://github.com/vivahome2) • [@vsmenon](https://github.com/vsmenon)
+[@walley892](https://github.com/walley892) • [@xster](https://github.com/xster) • [@yjbanov](https://github.com/yjbanov) • [@zanderso](https://github.com/zanderso)
+[@zhenqiu1101](https://github.com/zhenqiu1101) • [@zijiehe-google-com](https://github.com/zijiehe-google-com) • [@zoeyfan](https://github.com/zoeyfan)
+
+## Committers (`@flutter/committers`)
+
+Committers hold GitHub Write permissions (merge rights) and provide authoritative code reviews.
+
+| Contributor | GitHub profile | 12m merged PRs | 12m total activity |
+| :--- | :--- | :--- | :--- |
+| @AbdeMohlbi | [github.com/AbdeMohlbi](https://github.com/AbdeMohlbi) | 138 | 236 |
+| @huycozy | [github.com/huycozy](https://github.com/huycozy) | 11 | 33 |
+| @JavadAsadi | [github.com/JavadAsadi](https://github.com/JavadAsadi) | 42 | 48 |
+| @ksokolovskyi | [github.com/ksokolovskyi](https://github.com/ksokolovskyi) | 21 | 34 |
+| @Mairramer | [github.com/Mairramer](https://github.com/Mairramer) | 28 | 43 |
+| @navaronbracke | [github.com/navaronbracke](https://github.com/navaronbracke) | 43 | 334 |
+| @rkishan516 | [github.com/rkishan516](https://github.com/rkishan516) | 50 | 76 |
+| @ValentinVignal | [github.com/ValentinVignal](https://github.com/ValentinVignal) | 30 | 45 |
+
+## Reviewers (`@flutter/reviewers`)
+
+Reviewers hold GitHub Triage permissions, triage issues, and conduct first-pass code reviews.
+
+| Contributor | GitHub profile | 12m merged PRs | 12m total activity |
+| :--- | :--- | :--- | :--- |
+| @bleroux | [github.com/bleroux](https://github.com/bleroux) | 15 | 23 |
+| @csells | [github.com/csells](https://github.com/csells) | 11 | 21 |
+| @davidhicks980 | [github.com/davidhicks980](https://github.com/davidhicks980) | 12 | 24 |
+| @filiph | [github.com/filiph](https://github.com/filiph) | 0 | 10 |
+| @Hari-07 | [github.com/Hari-07](https://github.com/Hari-07) | 9 | 30 |
+| @htrolle-epam | [github.com/htrolle-epam](https://github.com/htrolle-epam) | 15 | 15 |
+| @jwinarske | [github.com/jwinarske](https://github.com/jwinarske) | 4 | 23 |
+| @piedcipher | [github.com/piedcipher](https://github.com/piedcipher) | 6 | 15 |
+| @RobertOdrowaz | [github.com/RobertOdrowaz](https://github.com/RobertOdrowaz) | 7 | 12 |
+| @stuartmorgan | [github.com/stuartmorgan](https://github.com/stuartmorgan) | 4 | 13 |
+| @tirth-patel-nc | [github.com/tirth-patel-nc](https://github.com/tirth-patel-nc) | 0 | 10 |
+| @wolfenrain | [github.com/wolfenrain](https://github.com/wolfenrain) | 0 | 16 |
+| @zemanux | [github.com/zemanux](https://github.com/zemanux) | 6 | 24 |
+
+## Dasher Emeritus
+
+Former ladder members who have stepped back from active contribution do not remain in the GitHub organization and are honored in [EMERITUS.md](EMERITUS.md).
diff --git a/data/contributors.yaml b/data/contributors.yaml
new file mode 100644
index 0000000..a8fc989
--- /dev/null
+++ b/data/contributors.yaml
@@ -0,0 +1,902 @@
+# Flutter Contributor Ladder Roster
+# Source of truth for Flutter contributor roles and permissions.
+# Last updated: 2026-10-27
+
+maintainers:
+  # Maintainers on the Flutter team (@flutter/googlers and @flutter/partners)
+  # Granted Write access + Org Moderation
+  googlers:
+    - username: aam
+      role: maintainer
+    - username: abdallahshaban557
+      role: maintainer
+    - username: alexmarkov
+      role: maintainer
+    - username: amcasari
+      role: maintainer
+    - username: ananci
+      role: maintainer
+    - username: anderdobo
+      role: maintainer
+    - username: andrewkolos
+      role: maintainer
+    - username: andywolff
+      role: maintainer
+    - username: another-rex
+      role: maintainer
+    - username: apwilson
+      role: maintainer
+    - username: arbreng
+      role: maintainer
+    - username: athomas
+      role: maintainer
+    - username: b-luk
+      role: maintainer
+    - username: biggs0125
+      role: maintainer
+    - username: bkonyi
+      role: maintainer
+    - username: bparrishMines
+      role: maintainer
+    - username: brianquinlan
+      role: maintainer
+    - username: bwilkerson
+      role: maintainer
+    - username: camsim99
+      role: maintainer
+    - username: CarlosMendonca
+      role: maintainer
+    - username: caroqliu
+      role: maintainer
+    - username: catharp
+      role: maintainer
+    - username: cbracken
+      role: maintainer
+    - username: chandarrengoog
+      role: maintainer
+    - username: chaselatta
+      role: maintainer
+    - username: chingjun
+      role: maintainer
+    - username: chloestefantsova
+      role: maintainer
+    - username: chrisraygill
+      role: maintainer
+    - username: ChristianEdwardPadilla
+      role: maintainer
+    - username: chunhtai
+      role: maintainer
+    - username: cj-radcliff
+      role: maintainer
+    - username: cligh
+      role: maintainer
+    - username: conooi
+      role: maintainer
+    - username: cpsloal
+      role: maintainer
+    - username: craiglabenz
+      role: maintainer
+    - username: davidmorgan
+      role: maintainer
+    - username: DBowen33
+      role: maintainer
+    - username: dcharkes
+      role: maintainer
+    - username: di
+      role: maintainer
+    - username: ditman
+      role: maintainer
+    - username: dkwingsmt
+      role: maintainer
+    - username: domesticmouse
+      role: maintainer
+    - username: dsmcl
+      role: maintainer
+    - username: dustingreen
+      role: maintainer
+    - username: eieio
+      role: maintainer
+    - username: elliette
+      role: maintainer
+    - username: emckean
+      role: maintainer
+    - username: ericwindmill
+      role: maintainer
+    - username: essjay05
+      role: maintainer
+    - username: ethanalee-work
+      role: maintainer
+    - username: everyplace
+      role: maintainer
+    - username: eyebrowsoffire
+      role: maintainer
+    - username: flar
+      role: maintainer
+    - username: flutter-zl
+      role: maintainer
+    - username: gaaclarke
+      role: maintainer
+    - username: GemmaJAy
+      role: maintainer
+    - username: gitrey
+      role: maintainer
+    - username: gmackall
+      role: maintainer
+    - username: goderbauer
+      role: maintainer
+    - username: grouma
+      role: maintainer
+    - username: gspencergoog
+      role: maintainer
+    - username: guidezpl
+      role: maintainer
+    - username: h9jiang
+      role: maintainer
+    - username: hannah-hyj
+      role: maintainer
+    - username: harryterkelsen
+      role: maintainer
+    - username: helin24
+      role: maintainer
+    - username: hellohuanlin
+      role: maintainer
+    - username: ievdokdm
+      role: maintainer
+    - username: iinozemtsev
+      role: maintainer
+    - username: InMatrix
+      role: maintainer
+    - username: itsjustkevin
+      role: maintainer
+    - username: jacob314
+      role: maintainer
+    - username: jacobsimionato
+      role: maintainer
+    - username: jaeheon
+      role: maintainer
+    - username: jakemac53
+      role: maintainer
+    - username: jalseth
+      role: maintainer
+    - username: jensjoha
+      role: maintainer
+    - username: jesskuras
+      role: maintainer
+    - username: jesswrd
+      role: maintainer
+    - username: jiahaog
+      role: maintainer
+    - username: jmagman
+      role: maintainer
+    - username: joefspiro
+      role: maintainer
+    - username: johnmccutchan
+      role: maintainer
+    - username: johnniwinther
+      role: maintainer
+    - username: johnpryan
+      role: maintainer
+    - username: johnsonmh
+      role: maintainer
+    - username: jonasfj
+      role: maintainer
+    - username: jonathanmetzman
+      role: maintainer
+    - username: josemontespg
+      role: maintainer
+    - username: joshualitt
+      role: maintainer
+    - username: jq129398
+      role: maintainer
+    - username: jrwang
+      role: maintainer
+    - username: jtmcdole
+      role: maintainer
+    - username: justinmc
+      role: maintainer
+    - username: jwill
+      role: maintainer
+    - username: jwren
+      role: maintainer
+    - username: jyameo
+      role: maintainer
+    - username: kallentu
+      role: maintainer
+    - username: keertip
+      role: maintainer
+    - username: kentnguyen99
+      role: maintainer
+    - username: kenzieschmoll
+      role: maintainer
+    - username: kevmoo
+      role: maintainer
+    - username: kevya-google
+      role: maintainer
+    - username: khanhnwin
+      role: maintainer
+    - username: kkboateng
+      role: maintainer
+    - username: lamek
+      role: maintainer
+    - username: leafpetersen
+      role: maintainer
+    - username: liamappelbe
+      role: maintainer
+    - username: loic-sharma
+      role: maintainer
+    - username: LongCatIsLooong
+      role: maintainer
+    - username: LouiseHsu
+      role: maintainer
+    - username: mariamhas
+      role: maintainer
+    - username: Markzipan
+      role: maintainer
+    - username: MaryaBelanger
+      role: maintainer
+    - username: maryx
+      role: maintainer
+    - username: mboetger
+      role: maintainer
+    - username: mbrase
+      role: maintainer
+    - username: mdebbar
+      role: maintainer
+    - username: michaelkedar
+      role: maintainer
+    - username: mit-mit
+      role: maintainer
+    - username: mkustermann
+      role: maintainer
+    - username: mosuem
+      role: maintainer
+    - username: mraleph
+      role: maintainer
+    - username: munificent
+      role: maintainer
+    - username: MuthuGCodes
+      role: maintainer
+    - username: nan-yu
+      role: maintainer
+    - username: natebosch
+      role: maintainer
+    - username: nickyringland
+      role: maintainer
+    - username: nshahan
+      role: maintainer
+    - username: nuritzi
+      role: maintainer
+    - username: okorohelijah
+      role: maintainer
+    - username: oliverchang
+      role: maintainer
+    - username: omerlevran46
+      role: maintainer
+    - username: peixinli
+      role: maintainer
+    - username: pennzht
+      role: maintainer
+    - username: Piinks
+      role: maintainer
+    - username: pjkammer
+      role: maintainer
+    - username: polina-c
+      role: maintainer
+    - username: pq
+      role: maintainer
+    - username: precision
+      role: maintainer
+    - username: QuncCccccc
+      role: maintainer
+    - username: redbrogdon
+      role: maintainer
+    - username: reidbaker
+      role: maintainer
+    - username: renaudd
+      role: maintainer
+    - username: renyou
+      role: maintainer
+    - username: Renzo-Olivares
+      role: maintainer
+    - username: rmacnak-google
+      role: maintainer
+    - username: rodydavis
+      role: maintainer
+    - username: rspier
+      role: maintainer
+    - username: Rusino
+      role: maintainer
+    - username: scheglov
+      role: maintainer
+    - username: sethladd
+      role: maintainer
+    - username: sfshaza2
+      role: maintainer
+    - username: shanecglass
+      role: maintainer
+    - username: sigmundch
+      role: maintainer
+    - username: sigurdm
+      role: maintainer
+    - username: snikiche
+      role: maintainer
+    - username: sokoloff06
+      role: maintainer
+    - username: srawlins
+      role: maintainer
+    - username: srujzs
+      role: maintainer
+    - username: sstrickl
+      role: maintainer
+    - username: stef-luo
+      role: maintainer
+    - username: stereotype441
+      role: maintainer
+    - username: stevemessick
+      role: maintainer
+    - username: studgeek
+      role: maintainer
+    - username: suertreus
+      role: maintainer
+    - username: szakarias
+      role: maintainer
+    - username: tarobins
+      role: maintainer
+    - username: tarrinneal
+      role: maintainer
+    - username: tasnim-khan
+      role: maintainer
+    - username: thagomizer
+      role: maintainer
+    - username: thkim1011
+      role: maintainer
+    - username: timothyhoang-google
+      role: maintainer
+    - username: twerske
+      role: maintainer
+    - username: uysalere
+      role: maintainer
+    - username: vashworth
+      role: maintainer
+    - username: victorsanni
+      role: maintainer
+    - username: vivahome2
+      role: maintainer
+    - username: vsmenon
+      role: maintainer
+    - username: walley892
+      role: maintainer
+    - username: xster
+      role: maintainer
+    - username: yjbanov
+      role: maintainer
+    - username: zanderso
+      role: maintainer
+    - username: zhenqiu1101
+      role: maintainer
+    - username: zijiehe-google-com
+      role: maintainer
+    - username: zoeyfan
+      role: maintainer
+  partners:
+    - username: bdero
+      team: "@flutter/flutter_gpu"
+      role: maintainer
+    - username: danielleon-cmd
+      team: "@flutter/cloudsufi"
+      role: maintainer
+    - username: DanTup
+      team: "@flutter/partners"
+      role: maintainer
+    - username: danxorzum
+      team: "@flutter/virtusa"
+      role: maintainer
+    - username: Dipakkumarjena
+      team: "@flutter/techm"
+      role: maintainer
+    - username: dkbharti-glitch
+      team: "@flutter/techm"
+      role: maintainer
+    - username: Hixie
+      team: "@flutter/partners"
+      role: maintainer
+    - username: jokerttu
+      team: "@flutter/codemate"
+      role: maintainer
+    - username: juan-mora-google
+      team: "@flutter/virtusa"
+      role: maintainer
+    - username: knopp
+      team: "@flutter/canonical"
+      role: maintainer
+    - username: mattkae
+      team: "@flutter/canonical"
+      role: maintainer
+    - username: mbcorona
+      team: "@flutter/tcs"
+      role: maintainer
+    - username: mikaelkomu
+      team: "@flutter/codemate"
+      role: maintainer
+    - username: mmohankrishna-lab
+      team: "@flutter/techm"
+      role: maintainer
+    - username: muralikrishmt
+      team: "@flutter/techm"
+      role: maintainer
+    - username: parlough
+      team: "@flutter/partners"
+      role: maintainer
+    - username: paul-geoghegan
+      team: "@flutter/canonical"
+      role: maintainer
+    - username: preethi0228-git
+      team: "@flutter/tcs"
+      role: maintainer
+    - username: puneetkukreja98
+      team: "@flutter/tcs"
+      role: maintainer
+    - username: ranbeuer
+      team: "@flutter/virtusa"
+      role: maintainer
+    - username: robert-ancell
+      team: "@flutter/canonical"
+      role: maintainer
+    - username: ronit-cloudsufi
+      team: "@flutter/cloudsufi"
+      role: maintainer
+    - username: samuli-codemate
+      team: "@flutter/codemate"
+      role: maintainer
+    - username: saurabh-mirajkar
+      team: "@flutter/tcs"
+      role: maintainer
+    - username: Saviq
+      team: "@flutter/canonical"
+      role: maintainer
+    - username: schultek
+      team: "@flutter/partners"
+      role: maintainer
+    - username: suryaKommana2662
+      team: "@flutter/tcs"
+      role: maintainer
+    - username: utopicnarwhal
+      team: "@flutter/codemate"
+      role: maintainer
+    - username: victogomez-cs
+      team: "@flutter/cloudsufi"
+      role: maintainer
+
+committers:
+  # Members of @flutter/committers (Child of @flutter/flutter-hackers)
+  # Granted GitHub Write role / merge access
+  - username: AbdeMohlbi
+    role: committer
+  - username: huycozy
+    role: committer
+  - username: JavadAsadi
+    role: committer
+  - username: ksokolovskyi
+    role: committer
+  - username: Mairramer
+    role: committer
+  - username: navaronbracke
+    role: committer
+  - username: rkishan516
+    role: committer
+  - username: ValentinVignal
+    role: committer
+
+reviewers:
+  # Members of @flutter/reviewers (Child of @flutter/flutter-hackers)
+  # Granted GitHub Triage role
+  - username: bleroux
+    role: reviewer
+  - username: csells
+    role: reviewer
+  - username: davidhicks980
+    role: reviewer
+  - username: filiph
+    role: reviewer
+  - username: Hari-07
+    role: reviewer
+  - username: htrolle-epam
+    grace_until: "2027-10-14"
+    role: reviewer
+  - username: jwinarske
+    role: reviewer
+  - username: piedcipher
+    role: reviewer
+  - username: RobertOdrowaz
+    role: reviewer
+  - username: stuartmorgan
+    role: reviewer
+  - username: tirth-patel-nc
+    role: reviewer
+  - username: wolfenrain
+    role: reviewer
+  - username: zemanux
+    role: reviewer
+
+dash_emeritus:
+  # Honored alumni (External, non-org members on GitHub)
+  - username: 0xZOne
+    role: emeritus
+  - username: 324mao
+    role: emeritus
+  - username: a14n
+    role: emeritus
+  - username: aaron-sf
+    role: emeritus
+  - username: adarshprabhu
+    role: emeritus
+  - username: adicahyono
+    role: emeritus
+  - username: akrwb
+    role: emeritus
+  - username: albertodev01
+    role: emeritus
+  - username: alestiago
+    role: emeritus
+  - username: AlexV525
+    role: emeritus
+  - username: allisonryan0002
+    role: emeritus
+  - username: almasryalyoum
+    role: emeritus
+  - username: alxp1982
+    role: emeritus
+  - username: AnnaPS
+    role: emeritus
+  - username: antonellof
+    role: emeritus
+  - username: ANTONINEUTRON
+    role: emeritus
+  - username: AntonyKiragu
+    role: emeritus
+  - username: atrope
+    role: emeritus
+  - username: AustinGTI
+    role: emeritus
+  - username: AyushBherwani1998
+    role: emeritus
+  - username: azchohfi
+    role: emeritus
+  - username: bartekpacia
+    role: emeritus
+  - username: BerkSpar
+    role: emeritus
+  - username: bernaferrari
+    role: emeritus
+  - username: brianegan
+    role: emeritus
+  - username: bruno-garcia
+    role: emeritus
+  - username: bselwe
+    role: emeritus
+  - username: btobin
+    role: emeritus
+  - username: budikhafiKLY
+    role: emeritus
+  - username: burakkasikci
+    role: emeritus
+  - username: CareF
+    role: emeritus
+  - username: chenglu
+    role: emeritus
+  - username: chinmoy12c
+    role: emeritus
+  - username: chriscraws
+    role: emeritus
+  - username: cityxsuperapp
+    role: emeritus
+  - username: CoffeeDevUK
+    role: emeritus
+  - username: ColdPaleLight
+    role: emeritus
+  - username: collinjackson
+    role: emeritus
+  - username: dam-ease
+    role: emeritus
+  - username: danagbemava-nc
+    role: emeritus
+  - username: darshankawar
+    role: emeritus
+  - username: dclark-disney
+    role: emeritus
+  - username: diarmaidlindsay
+    role: emeritus
+  - username: diegogawenda
+    role: emeritus
+  - username: diegoveloper
+    role: emeritus
+  - username: djol
+    role: emeritus
+  - username: dominikIncibit
+    role: emeritus
+  - username: eda-nagao
+    role: emeritus
+  - username: eggfly
+    role: emeritus
+  - username: egoe
+    role: emeritus
+  - username: Ehesp
+    role: emeritus
+  - username: emma-roudabush-disney
+    role: emeritus
+  - username: emrebuyukozkan
+    role: emeritus
+  - username: ened
+    role: emeritus
+  - username: enzoftware
+    role: emeritus
+  - username: erickzanardo
+    role: emeritus
+  - username: eseidel
+    role: emeritus
+  - username: exaby73
+    role: emeritus
+  - username: farshad1489
+    role: emeritus
+  - username: felangel
+    role: emeritus
+  - username: FirentisTFW
+    role: emeritus
+  - username: FlutterIssues
+    role: emeritus
+  - username: FXschwartz
+    role: emeritus
+  - username: gastonliz
+    role: emeritus
+  - username: gianfrancopapa
+    role: emeritus
+  - username: gnprice
+    role: emeritus
+  - username: guoguo338
+    role: emeritus
+  - username: hamdikahloun
+    role: emeritus
+  - username: harri35
+    role: emeritus
+  - username: hbatagelo
+    role: emeritus
+  - username: helinanever
+    role: emeritus
+  - username: hgraceb
+    role: emeritus
+  - username: HidenoriMatsubayashi
+    role: emeritus
+  - username: hillelcoren
+    role: emeritus
+  - username: Hiroaki-Kanai
+    role: emeritus
+  - username: horiaciu
+    role: emeritus
+  - username: IanSimpson
+    role: emeritus
+  - username: ihorkozar
+    role: emeritus
+  - username: irmasantoso
+    role: emeritus
+  - username: itsjen
+    role: emeritus
+  - username: ja-dfir
+    role: emeritus
+  - username: Jan-Stepien
+    role: emeritus
+  - username: jcollins-disney
+    role: emeritus
+  - username: JErazo7
+    role: emeritus
+  - username: jeroen-meijer
+    role: emeritus
+  - username: Jhon-Aires
+    role: emeritus
+  - username: jingshao-code
+    role: emeritus
+  - username: jnschulze
+    role: emeritus
+  - username: jomblocoder
+    role: emeritus
+  - username: jorgecoca
+    role: emeritus
+  - username: jpnurmi
+    role: emeritus
+  - username: JsouLiang
+    role: emeritus
+  - username: Justian-SopraSteria
+    role: emeritus
+  - username: kaiceyd
+    role: emeritus
+  - username: kenvandine
+    role: emeritus
+  - username: kevinburns426
+    role: emeritus
+  - username: kinla004
+    role: emeritus
+  - username: Kirpal
+    role: emeritus
+  - username: kmillikin
+    role: emeritus
+  - username: kokoro-team
+    role: emeritus
+  - username: kondoakio
+    role: emeritus
+  - username: KristinBi
+    role: emeritus
+  - username: kwg4
+    role: emeritus
+  - username: laramartin
+    role: emeritus
+  - username: leoafarias
+    role: emeritus
+  - username: linxuebin1990
+    role: emeritus
+  - username: LinXunFeng
+    role: emeritus
+  - username: lucavenir
+    role: emeritus
+  - username: luckysmg
+    role: emeritus
+  - username: MacarenaSantos
+    role: emeritus
+  - username: magicianA
+    role: emeritus
+  - username: maheshj01
+    role: emeritus
+  - username: martinduva
+    role: emeritus
+  - username: MaruQuarky
+    role: emeritus
+  - username: marwfair
+    role: emeritus
+  - username: matiasleyba
+    role: emeritus
+  - username: matsuda-shota
+    role: emeritus
+  - username: matthew-carroll
+    role: emeritus
+  - username: matthewshahi
+    role: emeritus
+  - username: mattmartelnz
+    role: emeritus
+  - username: MauriPastorini
+    role: emeritus
+  - username: maxp89
+    role: emeritus
+  - username: mchudy
+    role: emeritus
+  - username: Menshoz
+    role: emeritus
+  - username: mhadaily
+    role: emeritus
+  - username: milezabaleta
+    role: emeritus
+  - username: miquelbeltran
+    role: emeritus
+  - username: moffatman
+    role: emeritus
+  - username: MrUnfunny
+    role: emeritus
+  - username: msangalli
+    role: emeritus
+  - username: mvanbeusekom
+    role: emeritus
+  - username: nikosportolos
+    role: emeritus
+  - username: nirunirosha401-personal
+    role: emeritus
+  - username: noboru-i
+    role: emeritus
+  - username: nt4f04uNd
+    role: emeritus
+  - username: okursoftware
+    role: emeritus
+  - username: omartinma
+    role: emeritus
+  - username: omatt
+    role: emeritus
+  - username: pedromassango
+    role: emeritus
+  - username: pingbird
+    role: emeritus
+  - username: PoojaB26
+    role: emeritus
+  - username: QMAshfaqAli
+    role: emeritus
+  - username: rahulan
+    role: emeritus
+  - username: rajayogan
+    role: emeritus
+  - username: renefloor
+    role: emeritus
+  - username: Rexios80
+    role: emeritus
+  - username: rzambroni
+    role: emeritus
+  - username: Salakar
+    role: emeritus
+  - username: scarletteliza
+    role: emeritus
+  - username: scutlight
+    role: emeritus
+  - username: SenseiMinimal
+    role: emeritus
+  - username: shirbayat
+    role: emeritus
+  - username: simpson-peter
+    role: emeritus
+  - username: slightfoot
+    role: emeritus
+  - username: SofiaRey
+    role: emeritus
+  - username: spideythewebhead
+    role: emeritus
+  - username: spjass
+    role: emeritus
+  - username: spratt-disney
+    role: emeritus
+  - username: ssmitienko
+    role: emeritus
+  - username: sushanthmshetty
+    role: emeritus
+  - username: swavkulinski
+    role: emeritus
+  - username: Swiftaxe
+    role: emeritus
+  - username: tanercc
+    role: emeritus
+  - username: tcannon-disney
+    role: emeritus
+  - username: tfabacher-dp
+    role: emeritus
+  - username: tgucio
+    role: emeritus
+  - username: thekorn
+    role: emeritus
+  - username: TimoPieti
+    role: emeritus
+  - username: tomgilder
+    role: emeritus
+  - username: tpiaggio
+    role: emeritus
+  - username: trevorplant
+    role: emeritus
+  - username: tsurumotokdi
+    role: emeritus
+  - username: udayon
+    role: emeritus
+  - username: vaind
+    role: emeritus
+  - username: valentinallavayol
+    role: emeritus
+  - username: Vanethos
+    role: emeritus
+  - username: vickyduran
+    role: emeritus
+  - username: wakita181009
+    role: emeritus
+  - username: wangying3426
+    role: emeritus
+  - username: werainkhatri
+    role: emeritus
+  - username: whesse
+    role: emeritus
+  - username: workerbee22
+    role: emeritus
+  - username: wprater
+    role: emeritus
+  - username: xm0128
+    role: emeritus
+  - username: xu-baolin
+    role: emeritus
+  - username: YeungKC
+    role: emeritus
+  - username: yiiim
+    role: emeritus
+  - username: ymgn-dev
+    role: emeritus
+  - username: zhongwuzw
+    role: emeritus
+  - username: Zudah228
+    role: emeritus
diff --git a/docs/TRANSITION.md b/docs/TRANSITION.md
index 74d19cb..4755df4 100644
--- a/docs/TRANSITION.md
+++ b/docs/TRANSITION.md
@@ -27,12 +27,12 @@ Inactive historical `flutter-hackers` ($< 10$ contributions in the preceding 12
 
 ## Organization audit
 
-To ensure all existing GitHub organization members are categorized, the initial bootstrap tool (`tool/seed_initial_data.dart`) reviews all members of the `flutter` GitHub organization (`gh api orgs/flutter/members`) and cross-references each account against `@flutter/googlers`, `@flutter/partners`, `@flutter/flutter-hackers`, and 12-month activity data. Untracked active contributors are placed into their qualifying tier (`Committer` or `Reviewer`), while inactive organization members and former `flutter-hackers` ($< 10$ contributions in the preceding 12 months) transition to Dasher Emeritus, are removed from the GitHub organization, and are listed in [EMERITUS.md](../EMERITUS.md).
+To ensure all existing GitHub organization members are categorized, the initial audit reviews all members of the `flutter` GitHub organization (`gh api orgs/flutter/members`) and cross-references each account against `@flutter/googlers`, `@flutter/partners`, `@flutter/flutter-hackers`, and 12-month activity data to populate `data/contributors.yaml`. Untracked active contributors are placed into their qualifying tier (`Committer` or `Reviewer`), while inactive organization members and former `flutter-hackers` ($< 10$ contributions in the preceding 12 months) transition to Dasher Emeritus, are removed from the GitHub organization, and are listed in [EMERITUS.md](../EMERITUS.md).
 
 ## Retirement of static AUTHORS files
 
 Historically, repository-level `AUTHORS` files (`flutter/flutter/AUTHORS`, `flutter/packages/AUTHORS`, etc.) tracked individual contributors. Over time, these files became static and difficult to maintain. `flutter/contributors` now serves as the single source of truth for contributor roles and permissions, while historical `AUTHORS` files are preserved under `legacy_authors/`. The active ladder roster is published in [ROSTER.md](../ROSTER.md) and Dasher Emeriti are listed in [EMERITUS.md](../EMERITUS.md), both generated from `data/contributors.yaml`.
 
-## Data seeding
+## Rolling activity dataset
 
-`tool/seed_initial_data.dart` creates `data/activity_summary.json` seeded with the baseline Year 0 analysis, and daily syncs update the current ISO week activity in `data/activity/YYYY-Wxx.json`. Over the first 12 months, the rolling 52-week dataset becomes self-sustaining.
+`data/activity_summary.json` aggregates rolling 12-month contribution counts across the 52 weekly snapshots in `data/activity/YYYY-Wxx.json`, and daily syncs (`tool/sync_activity.dart`) update the current ISO week activity and recompute the summary automatically.
diff --git a/test/bots_test.dart b/test/bots_test.dart
index c0342de..a009ba3 100644
--- a/test/bots_test.dart
+++ b/test/bots_test.dart
@@ -31,6 +31,7 @@ void main() {
       expect(isBot('renovate[bot]'), isTrue);
       expect(isBot('DartDevtoolWorkflowBot'), isTrue);
       expect(isBot('reidbaker-agent'), isTrue);
+      expect(isBot('renzo-olivares-agent'), isTrue);
       expect(isBot('gemini-code-assist'), isTrue);
       expect(isBot('gemini-code-assist[bot]'), isTrue);
       expect(isBot('buildbot'), isTrue);
@@ -39,6 +40,7 @@ void main() {
     test('identifies pattern-based bot usernames', () {
       expect(isBot('some-user-bot'), isTrue);
       expect(isBot('some_user_bot'), isTrue);
+      expect(isBot('some-user-agent'), isTrue);
       expect(isBot('service[bot]'), isTrue);
       expect(isBot('flutter-autoroll'), isTrue);
       expect(isBot('custom-autoroll-service'), isTrue);
diff --git a/test/roster_validation_test.dart b/test/roster_validation_test.dart
new file mode 100644
index 0000000..96b3a95
--- /dev/null
+++ b/test/roster_validation_test.dart
@@ -0,0 +1,304 @@
+// Copyright 2026 The Flutter Authors.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'dart:io';
+import 'package:test/test.dart';
+import 'package:yaml/yaml.dart';
+import '../tool/generate_roster.dart';
+import '../tool/validate_roster.dart';
+
+void main() {
+  group('Roster Schema & Integrity Tests', () {
+    late String yamlContent;
+    late YamlMap doc;
+
+    setUpAll(() {
+      final file = File('data/contributors.yaml');
+      expect(file.existsSync(), isTrue,
+          reason: 'data/contributors.yaml must exist');
+      yamlContent = file.readAsStringSync();
+      final loaded = loadYaml(yamlContent);
+      expect(loaded, isA<YamlMap>());
+      doc = loaded as YamlMap;
+    });
+
+    test('contributors.yaml contains all required root sections', () {
+      expect(doc.containsKey('maintainers'), isTrue);
+      expect(doc.containsKey('committers'), isTrue);
+      expect(doc.containsKey('reviewers'), isTrue);
+      expect(doc.containsKey('dash_emeritus'), isTrue);
+    });
+
+    test('maintainers contains strictly googlers and partners', () {
+      final maintainers = doc['maintainers'] as YamlMap;
+      expect(maintainers.keys.toSet(), equals({'googlers', 'partners'}));
+
+      final googlers = maintainers['googlers'] as YamlList;
+      final partners = maintainers['partners'] as YamlList;
+
+      expect(googlers, isNotEmpty);
+      expect(partners, isNotEmpty);
+    });
+
+    test('all member handles across the entire roster are unique', () {
+      final seen = <String, String>{};
+
+      void checkUser(dynamic entry, String section) {
+        expect(entry, isA<YamlMap>());
+        final username = (entry as YamlMap)['username'] as String?;
+        expect(username, isNotNull);
+        expect(username!.trim(), isNotEmpty);
+
+        final lower = username.toLowerCase();
+        expect(seen.containsKey(lower), isFalse,
+            reason:
+                'Duplicate username "@$username" in $section (already in ${seen[lower]})');
+        seen[lower] = section;
+      }
+
+      final maintainers = doc['maintainers'] as YamlMap;
+      for (final g in maintainers['googlers'] as YamlList) {
+        checkUser(g, 'maintainers.googlers');
+      }
+      for (final p in maintainers['partners'] as YamlList) {
+        checkUser(p, 'maintainers.partners');
+      }
+      for (final c in doc['committers'] as YamlList) {
+        checkUser(c, 'committers');
+      }
+      for (final r in doc['reviewers'] as YamlList) {
+        checkUser(r, 'reviewers');
+      }
+      for (final e in doc['dash_emeritus'] as YamlList) {
+        checkUser(e, 'dash_emeritus');
+      }
+    });
+
+    test('all roles belong to the allowed set of ladder roles', () {
+      const allowedRoles = {'maintainer', 'committer', 'reviewer', 'emeritus'};
+
+      void verifyRole(dynamic entry) {
+        final map = entry as YamlMap;
+        final role = map['role'] as String? ?? map['suggested_role'] as String?;
+        if (role != null) {
+          expect(allowedRoles.contains(role.toLowerCase()), isTrue,
+              reason: 'Invalid role "$role" for user ${map['username']}');
+        }
+      }
+
+      final maintainers = doc['maintainers'] as YamlMap;
+      (maintainers['googlers'] as YamlList).forEach(verifyRole);
+      (maintainers['partners'] as YamlList).forEach(verifyRole);
+      (doc['committers'] as YamlList).forEach(verifyRole);
+      (doc['reviewers'] as YamlList).forEach(verifyRole);
+      (doc['dash_emeritus'] as YamlList).forEach(verifyRole);
+    });
+
+    test('validateContributorsYaml passes on production data/contributors.yaml',
+        () {
+      expect(validateContributorsYaml(doc), isEmpty);
+    });
+
+    test(
+        'validateContributorsYaml detects invalid schemas, duplicate users, invalid roles, and invalid maintainer groups',
+        () {
+      expect(
+        validateContributorsYaml(loadYaml('- not_a_map')),
+        contains(contains('root must be a YAML mapping')),
+      );
+
+      final invalidDoc = loadYaml('''
+maintainers:
+  googlers:
+    - username: alice
+      role: maintainer
+      discord: "alice_discord"
+  partners:
+    - username: bob
+      role: maintainer
+  community:
+    - username: invalidGroupUser
+      role: maintainer
+committers:
+  - "not_a_map_entry"
+  - role: committer
+  - username: ALICE
+    role: committer
+  - username: charlie
+    role: superadmin
+  - username: dave
+    role: committer
+    discord: "   "
+reviewers: []
+dash_emeritus: []
+''');
+
+      final errors = validateContributorsYaml(invalidDoc);
+      expect(
+          errors,
+          contains(
+              contains('invalid group "community"'))); // non-googler/partner
+      expect(errors, contains(contains('entry is not a map')));
+      expect(errors, contains(contains('missing username')));
+      expect(errors,
+          contains(contains('duplicate username "@ALICE" in committers')));
+      expect(errors, contains(contains('invalid role "superadmin"')));
+      expect(
+          errors,
+          contains(
+              contains('invalid or empty discord username for user @dave')));
+    });
+
+    test(
+        'known_maintainers.txt single source of truth enforces Maintainer placement',
+        () {
+      final known = loadKnownExceptionMaintainers();
+      expect(
+          known,
+          containsAll([
+            'CarlosMendonca',
+            'LouiseHsu',
+            'abdallahshaban557',
+            'andywolff',
+            'gaaclarke',
+            'gmackall',
+            'jesswrd',
+          ]));
+
+      final badPlacementDoc = loadYaml('''
+maintainers:
+  googlers:
+    - username: Piinks
+      role: maintainer
+  partners: []
+committers:
+  - username: gaaclarke
+    role: committer
+reviewers: []
+dash_emeritus:
+  - username: CarlosMendonca
+    role: emeritus
+''');
+      final errors = validateContributorsYaml(badPlacementDoc);
+      expect(
+          errors,
+          contains(contains(
+              '"@gaaclarke" is a known Maintainer and must be listed under maintainers.googlers')));
+      expect(
+          errors,
+          contains(contains(
+              '"@CarlosMendonca" is a known Maintainer and must be listed under maintainers.googlers')));
+    });
+
+    test(
+        'buildRosterMarkdown, buildEmeritusMarkdown, and generate_roster CLI --check',
+        () {
+      final tempDir = Directory.systemTemp.createTempSync('roster_gen_test_');
+      try {
+        final yamlFile = File('${tempDir.path}/contributors.yaml');
+        final summaryFile = File('${tempDir.path}/activity_summary.json');
+        final rosterFile = File('${tempDir.path}/ROSTER.md');
+        final emeritusFile = File('${tempDir.path}/EMERITUS.md');
+
+        yamlFile.writeAsStringSync('''
+maintainers:
+  googlers:
+    - username: Piinks
+      role: maintainer
+  partners:
+    - username: robert-ancell
+      team: "@flutter/canonical"
+      role: maintainer
+
+committers:
+  - username: alice
+    role: committer
+
+reviewers:
+  - username: bob
+    role: reviewer
+
+dash_emeritus:
+  - username: formerDasher
+    role: emeritus
+''');
+        summaryFile.writeAsStringSync(
+            '{"alice": {"merged_prs": 15, "total": 40}, "bob": {"merged_prs": 3, "total": 12}}');
+
+        final parsedYaml = loadYaml(yamlFile.readAsStringSync()) as YamlMap;
+        expect(validateContributorsYaml(parsedYaml), isEmpty);
+        expect(buildRosterMarkdown(parsedYaml, {}),
+            contains('## Committers (`@flutter/committers`)'));
+        expect(
+            buildEmeritusMarkdown(parsedYaml), contains('# Dasher Emeritus'));
+
+        // --check should fail before ROSTER.md and EMERITUS.md exist
+        final checkBefore = Process.runSync('dart', [
+          'run',
+          'tool/generate_roster.dart',
+          '--check',
+          '--contributors',
+          yamlFile.path,
+          '--summary',
+          summaryFile.path,
+          '--roster',
+          rosterFile.path,
+          '--emeritus',
+          emeritusFile.path,
+        ]);
+        expect(checkBefore.exitCode, equals(1));
+
+        // Generate ROSTER.md and EMERITUS.md
+        final genResult = Process.runSync('dart', [
+          'run',
+          'tool/generate_roster.dart',
+          '--contributors',
+          yamlFile.path,
+          '--summary',
+          summaryFile.path,
+          '--roster',
+          rosterFile.path,
+          '--emeritus',
+          emeritusFile.path,
+        ]);
+        expect(genResult.exitCode, equals(0));
+        expect(rosterFile.existsSync(), isTrue);
+        expect(emeritusFile.existsSync(), isTrue);
+
+        final rosterMd = rosterFile.readAsStringSync();
+        expect(rosterMd, contains('[@Piinks](https://github.com/Piinks)'));
+        expect(rosterMd,
+            contains('[@robert-ancell](https://github.com/robert-ancell)'));
+        expect(
+            rosterMd,
+            contains(
+                '| @alice | [github.com/alice](https://github.com/alice) | 15 | 40 |'));
+        expect(rosterMd, isNot(contains('Prospective new joiners')));
+
+        final emeritusMd = emeritusFile.readAsStringSync();
+        expect(emeritusMd,
+            contains('[@formerDasher](https://github.com/formerDasher)'));
+        expect(emeritusMd, contains('https://github.com/flutter/rfc'));
+
+        // --check should now pass
+        final checkAfter = Process.runSync('dart', [
+          'run',
+          'tool/generate_roster.dart',
+          '--check',
+          '--contributors',
+          yamlFile.path,
+          '--summary',
+          summaryFile.path,
+          '--roster',
+          rosterFile.path,
+          '--emeritus',
+          emeritusFile.path,
+        ]);
+        expect(checkAfter.exitCode, equals(0));
+      } finally {
+        tempDir.deleteSync(recursive: true);
+      }
+    });
+  });
+}
diff --git a/tool/bots.dart b/tool/bots.dart
index 33010ab..6cc121d 100644
--- a/tool/bots.dart
+++ b/tool/bots.dart
@@ -60,6 +60,7 @@ const Set<String> knownBots = {
   'agentfu',
   'kenzie-agent',
   'reidbaker-agent',
+  'renzo-olivares-agent',
   'google-admin',
   'google-admin-automation-1',
   'google-admin-automation-2',
@@ -96,6 +97,7 @@ bool isBot(String username) {
   if (lower.endsWith('[bot]') ||
       lower.endsWith('-bot') ||
       lower.endsWith('_bot') ||
+      lower.endsWith('-agent') ||
       lower.contains('autoroll')) {
     return true;
   }
diff --git a/tool/generate_roster.dart b/tool/generate_roster.dart
new file mode 100644
index 0000000..18800cc
--- /dev/null
+++ b/tool/generate_roster.dart
@@ -0,0 +1,200 @@
+// Copyright 2026 The Flutter Authors.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'dart:convert';
+import 'dart:io';
+import 'package:args/args.dart';
+import 'package:yaml/yaml.dart';
+
+void main(List<String> args) {
+  final parser = ArgParser()
+    ..addFlag('check',
+        help:
+            'Verify that ROSTER.md and EMERITUS.md match data/contributors.yaml without modifying files',
+        defaultsTo: false)
+    ..addOption('contributors',
+        help: 'Path to contributors.yaml', defaultsTo: 'data/contributors.yaml')
+    ..addOption('summary',
+        help: 'Path to activity_summary.json',
+        defaultsTo: 'data/activity_summary.json')
+    ..addOption('roster', help: 'Path to ROSTER.md', defaultsTo: 'ROSTER.md')
+    ..addOption('emeritus',
+        help: 'Path to EMERITUS.md', defaultsTo: 'EMERITUS.md');
+
+  final results = parser.parse(args);
+  final isCheck = results['check'] as bool;
+  final contributorsPath = results['contributors'] as String;
+  final summaryPath = results['summary'] as String;
+  final rosterPath = results['roster'] as String;
+  final emeritusPath = results['emeritus'] as String;
+
+  final yamlFile = File(contributorsPath);
+  if (!yamlFile.existsSync()) {
+    print('Error: $contributorsPath not found.');
+    exit(1);
+  }
+
+  final doc = loadYaml(yamlFile.readAsStringSync()) as YamlMap;
+
+  final summaryFile = File(summaryPath);
+  var summary = <String, dynamic>{};
+  if (summaryFile.existsSync()) {
+    try {
+      summary =
+          jsonDecode(summaryFile.readAsStringSync()) as Map<String, dynamic>;
+    } catch (_) {}
+  }
+
+  String preservePendingAuditBanner(File targetFile, String generated) {
+    if (!targetFile.existsSync()) return generated;
+    final existing = targetFile.readAsStringSync();
+    final match = RegExp(
+      r'\n(> \[!IMPORTANT\]\n> \*\*Pending Q4 Audit:\*\*[^\n]*\n)',
+    ).firstMatch(existing);
+    if (match == null) return generated;
+    final firstNewline = generated.indexOf('\n');
+    if (firstNewline == -1) return generated;
+    return '${generated.substring(0, firstNewline + 1)}${match.group(0)}${generated.substring(firstNewline + 1)}';
+  }
+
+  final rosterFile = File(rosterPath);
+  final emeritusFile = File(emeritusPath);
+  final rosterContent =
+      preservePendingAuditBanner(rosterFile, buildRosterMarkdown(doc, summary));
+  final emeritusContent =
+      preservePendingAuditBanner(emeritusFile, buildEmeritusMarkdown(doc));
+
+  if (isCheck) {
+    final rosterOutOfSync = !rosterFile.existsSync() ||
+        rosterFile.readAsStringSync() != rosterContent;
+    final emeritusOutOfSync = !emeritusFile.existsSync() ||
+        emeritusFile.readAsStringSync() != emeritusContent;
+    if (rosterOutOfSync || emeritusOutOfSync) {
+      print(
+          'Error: ROSTER.md or EMERITUS.md is out of sync with data/contributors.yaml.');
+      print('Run `dart run tool/generate_roster.dart` to update them.');
+      exit(1);
+    }
+    print('ROSTER.md and EMERITUS.md are in sync with data/contributors.yaml.');
+  } else {
+    rosterFile.writeAsStringSync(rosterContent);
+    emeritusFile.writeAsStringSync(emeritusContent);
+    print(
+        'Generated ${rosterFile.path} and ${emeritusFile.path} successfully.');
+  }
+}
+
+List<String> _formatGridRows(List<String> usernames, {int columns = 4}) {
+  final rows = <String>[];
+  for (var i = 0; i < usernames.length; i += columns) {
+    final row = <String>[
+      for (var j = 0; j < columns && i + j < usernames.length; j++)
+        '[@${usernames[i + j]}](https://github.com/${usernames[i + j]})',
+    ];
+    rows.add(row.join(' • '));
+  }
+  return rows;
+}
+
+String buildRosterMarkdown(YamlMap doc, Map<String, dynamic> summary) {
+  final maintainers = doc['maintainers'] as YamlMap?;
+  final allMaintainers = <String>{
+    if (maintainers != null) ...[
+      for (final g in maintainers['googlers'] as YamlList? ?? [])
+        g['username'] as String,
+      for (final p in maintainers['partners'] as YamlList? ?? [])
+        p['username'] as String,
+    ],
+  };
+  final sortedMaintainers = allMaintainers.toList()
+    ..sort((a, b) => a.toLowerCase().compareTo(b.toLowerCase()));
+  final maintainerRows = _formatGridRows(sortedMaintainers);
+
+  final committers = doc['committers'] as YamlList? ?? [];
+  final committerRows = <String>[
+    for (final c in committers)
+      () {
+        final username = c['username'] as String;
+        final stats = summary[username] as Map<String, dynamic>?;
+        final prs = stats?['merged_prs'] ?? '-';
+        final total = stats?['total'] ?? '-';
+        return '| @$username | [github.com/$username](https://github.com/$username) | $prs | $total |';
+      }(),
+  ];
+
+  final reviewers = doc['reviewers'] as YamlList? ?? [];
+  final reviewerRows = <String>[
+    for (final r in reviewers)
+      () {
+        final username = r['username'] as String;
+        final stats = summary[username] as Map<String, dynamic>?;
+        final prs = stats?['merged_prs'] ?? '-';
+        final total = stats?['total'] ?? '-';
+        return '| @$username | [github.com/$username](https://github.com/$username) | $prs | $total |';
+      }(),
+  ];
+
+  return '''
+# Contributor Roster
+
+This directory lists active Flutter Contributor Ladder members.
+Honorary alumni who have stepped back from active contribution and exited the GitHub organization are listed in [EMERITUS.md](EMERITUS.md).
+Governance details and tier qualifications are specified in [docs/LADDER.md](docs/LADDER.md).
+
+> [!NOTE]
+> This file is automatically generated from `data/contributors.yaml`.
+> To update, edit `data/contributors.yaml` and run `dart run tool/generate_roster.dart`.
+
+## Maintainers (`@flutter/maintainers`)
+
+Maintainers hold GitHub Write permissions and organization moderation privileges, and belong to `@flutter/maintainers` (a child team of `@flutter/flutter-hackers`).
+
+${maintainerRows.join('\n')}
+
+## Committers (`@flutter/committers`)
+
+Committers hold GitHub Write permissions (merge rights) and provide authoritative code reviews.
+
+| Contributor | GitHub profile | 12m merged PRs | 12m total activity |
+| :--- | :--- | :--- | :--- |
+${committerRows.join('\n')}
+
+## Reviewers (`@flutter/reviewers`)
+
+Reviewers hold GitHub Triage permissions, triage issues, and conduct first-pass code reviews.
+
+| Contributor | GitHub profile | 12m merged PRs | 12m total activity |
+| :--- | :--- | :--- | :--- |
+${reviewerRows.join('\n')}
+
+## Dasher Emeritus
+
+Former ladder members who have stepped back from active contribution do not remain in the GitHub organization and are honored in [EMERITUS.md](EMERITUS.md).
+''';
+}
+
+String buildEmeritusMarkdown(YamlMap doc) {
+  final emeriti = doc['dash_emeritus'] as YamlList? ?? [];
+  final sortedEmeriti = emeriti.map((e) => e['username'] as String).toList()
+    ..sort((a, b) => a.toLowerCase().compareTo(b.toLowerCase()));
+  final emeritusRows = _formatGridRows(sortedEmeriti);
+
+  return '''
+# Dasher Emeritus
+
+This directory honors **Dasher Emeritus** alumni—former Flutter Reviewers, Committers, and Maintainers who previously held roles on the contributor ladder and have stepped back from active contribution (< 10 contributions over the preceding 12 months).
+
+To maintain repository security, Dasher Emeriti do not remain members of the `flutter` GitHub organization. Instead, their contributions are recognized here, and they retain access to Flutter contributor channels on Discord (including `#hidden-chat`) and the announcement-only `flutter-contributors` Google Group (for project announcements and calendar invites to our recurring Flutter Contributor Roundtable and the Dash Forum, where contributors can present and get feedback on their [RFCs](https://github.com/flutter/rfc); the registration form is pinned in `#hidden-chat` on Discord) so they can stay in touch and more easily ramp back up onto the project if and when they choose to return.
+
+Returning Emeriti who resume contributing are automatically identified during quarterly reviews (where they can reply directly on the public tracking issue). For off-cycle reinstatement, because creating new issues and pull requests in `flutter/contributors` is restricted to organization members (`collaborators`), returning Emeriti can reach out in `#hidden-chat` on Discord (or to an active organization member) to have an active org member sponsor and open a [Dasher Emeritus Reinstatement request](.github/ISSUE_TEMPLATE/2_emeritus_reinstatement.yml) on their behalf (where they can also share an updated Discord username if needed). See [docs/LADDER.md](docs/LADDER.md) for details.
+
+> [!NOTE]
+> This file is automatically generated from `data/contributors.yaml`.
+> To update, edit `data/contributors.yaml` and run `dart run tool/generate_roster.dart`.
+
+## Honored Alumni
+
+${emeritusRows.join('\n')}
+''';
+}
diff --git a/tool/validate_roster.dart b/tool/validate_roster.dart
new file mode 100644
index 0000000..d9de0eb
--- /dev/null
+++ b/tool/validate_roster.dart
@@ -0,0 +1,195 @@
+// Copyright 2026 The Flutter Authors.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'dart:io';
+import 'package:yaml/yaml.dart';
+import 'bots.dart';
+
+const validRoles = {'maintainer', 'committer', 'reviewer', 'emeritus'};
+
+const knownMaintainersPath =
+    '.agents/skills/quarterly-ladder-analysis/references/known_maintainers.txt';
+const knownBotsPath =
+    '.agents/skills/quarterly-ladder-analysis/references/bots.txt';
+
+/// Loads known bot/automation accounts from [knownBotsPath].
+Set<String> loadKnownBotReferences({String path = knownBotsPath}) {
+  final file = File(path);
+  if (!file.existsSync()) return {};
+  final result = <String>{};
+  for (final line in file.readAsLinesSync()) {
+    final trimmed = line.trim();
+    if (trimmed.isNotEmpty && !trimmed.startsWith('#')) {
+      result.add(trimmed.toLowerCase());
+    }
+  }
+  return result;
+}
+
+/// Loads known exception Maintainers from the single source of truth file
+/// ([knownMaintainersPath]).
+Set<String> loadKnownExceptionMaintainers(
+    {String path = knownMaintainersPath}) {
+  final file = File(path);
+  if (!file.existsSync()) return {};
+  final result = <String>{};
+  for (final line in file.readAsLinesSync()) {
+    final trimmed = line.trim();
+    if (trimmed.isNotEmpty && !trimmed.startsWith('#')) {
+      result.add(trimmed);
+    }
+  }
+  return result;
+}
+
+/// Returns true if [username] is listed in [knownMaintainersPath].
+bool isKnownExceptionMaintainer(String username,
+    {Set<String>? knownMaintainers}) {
+  final lower = username.toLowerCase().trim();
+  final set = knownMaintainers ?? loadKnownExceptionMaintainers();
+  return set.any((m) => m.toLowerCase() == lower);
+}
+
+/// Validates a parsed `contributors.yaml` document and returns a list of
+/// human-readable error strings (empty if valid).
+List<String> validateContributorsYaml(dynamic doc) {
+  if (doc is! YamlMap) {
+    return ['Error: data/contributors.yaml root must be a YAML mapping.'];
+  }
+
+  final seenUsers = <String, String>{};
+  final errors = <String>[];
+  final knownExceptionMaintainers = loadKnownExceptionMaintainers();
+  final knownExceptionLower =
+      knownExceptionMaintainers.map((u) => u.toLowerCase()).toSet();
+  final knownBotsLower = loadKnownBotReferences();
+
+  void validateUser(dynamic entry, String section,
+      {bool isMaintainer = false}) {
+    if (entry is! YamlMap) {
+      errors.add('Error in $section: entry is not a map: $entry');
+      return;
+    }
+
+    final username = entry['username'] as String?;
+    if (username == null || username.trim().isEmpty) {
+      errors.add('Error in $section: missing username: $entry');
+      return;
+    }
+
+    final lowerUser = username.toLowerCase();
+    if (isExcludedAccount(username) || knownBotsLower.contains(lowerUser)) {
+      errors.add(
+          'Error in $section: "@$username" is a bot or excluded automation account and must not be listed in contributors.yaml.');
+    }
+    if (seenUsers.containsKey(lowerUser)) {
+      errors.add(
+          'Error: duplicate username "@$username" in $section (already defined in ${seenUsers[lowerUser]})');
+    } else {
+      seenUsers[lowerUser] = section;
+    }
+
+    if (!isMaintainer && knownExceptionLower.contains(lowerUser)) {
+      errors.add(
+          'Error in $section: "@$username" is a known Maintainer and must be listed under maintainers.googlers.');
+    }
+
+    final role = entry['role'] as String? ?? entry['suggested_role'] as String?;
+    if (role != null && !validRoles.contains(role.toLowerCase())) {
+      errors.add(
+          'Error in $section: invalid role "$role" for user @$username. Valid roles: $validRoles');
+    }
+
+    if (entry.containsKey('discord')) {
+      final discord = entry['discord'];
+      if (discord is! String || discord.trim().isEmpty) {
+        errors.add(
+            'Error in $section: invalid or empty discord username for user @$username.');
+      }
+    }
+
+    if (entry.containsKey('grace_until')) {
+      final graceUntil = entry['grace_until'];
+      if (graceUntil is! String ||
+          DateTime.tryParse(graceUntil.trim()) == null) {
+        errors.add(
+            'Error in $section: invalid grace_until date "$graceUntil" for user @$username (expected YYYY-MM-DD).');
+      }
+    }
+  }
+
+  // Validate Maintainers (must strictly be googlers or partners)
+  final maintainers = doc['maintainers'];
+  if (maintainers is YamlMap) {
+    for (final key in maintainers.keys) {
+      if (key != 'googlers' && key != 'partners') {
+        errors.add(
+            'Error in maintainers: invalid group "$key". All Maintainers must be in "googlers" or "partners".');
+      }
+    }
+    final googlers = maintainers['googlers'];
+    if (googlers is YamlList) {
+      for (final g in googlers) {
+        validateUser(g, 'maintainers.googlers', isMaintainer: true);
+      }
+    }
+    final partners = maintainers['partners'];
+    if (partners is YamlList) {
+      for (final p in partners) {
+        validateUser(p, 'maintainers.partners', isMaintainer: true);
+      }
+    }
+  }
+
+  // Validate Committers
+  final committers = doc['committers'];
+  if (committers is YamlList) {
+    for (final c in committers) {
+      validateUser(c, 'committers');
+    }
+  }
+
+  // Validate Reviewers
+  final reviewers = doc['reviewers'];
+  if (reviewers is YamlList) {
+    for (final r in reviewers) {
+      validateUser(r, 'reviewers');
+    }
+  }
+
+  // Validate Dasher Emeritus
+  final emeriti = doc['dash_emeritus'];
+  if (emeriti is YamlList) {
+    for (final e in emeriti) {
+      validateUser(e, 'dash_emeritus');
+    }
+  }
+
+  return errors;
+}
+
+void main(List<String> args) {
+  final filePath = args.isNotEmpty ? args.first : 'data/contributors.yaml';
+  final file = File(filePath);
+  if (!file.existsSync()) {
+    print('Error: $filePath does not exist.');
+    exit(1);
+  }
+
+  print('Validating $filePath...');
+  final content = file.readAsStringSync();
+  final dynamic doc = loadYaml(content);
+
+  final errors = validateContributorsYaml(doc);
+  for (final err in errors) {
+    print(err);
+  }
+
+  if (errors.isNotEmpty) {
+    print('\nValidation FAILED with ${errors.length} errors.');
+    exit(1);
+  }
+
+  print('Validation SUCCESS: $filePath is valid.');
+}