feat(megarepo): cold named-branch worktree GC (#771) by schickling-assistant · Pull Request #780 · overengineeringstudio/effect-utils

schickling-assistant · 2026-06-11T12:13:56Z

Refs #771 — reframes the epic from artifact-pruning to safely deleting cold named-branch worktrees from the store (the dominant accumulation default GC can't reclaim today, since it blanket-protects every named ref).

This PR is design only (VRS docs); implementation pending.

What's here

docs/decisions/0001–0008 — the layered-gate model, one decision per file
docs/glossary.md — domain language (cold, live set, lossless floor, staleness, archive-as-trash, reap…)
docs/spec.md — a "Cold named-branch reclamation (designed, not yet implemented)" subsection

Agreed model (gates, in order, folded into default `mr store gc`)

Cross-megarepo live-set veto (hard) — never delete a worktree any registered workspace consumes
Lossless floor — commits reachable on a remote + capture-first
Staleness — GitHub PR merged (git-ancestor is unusable under squash-merge)
Grace windows — three timers: absence / post-merge / archive retention
Capture = archive → reap on TTL — unified with the <repo>/.archive/ worktree convention

Evidence

Read-only survey of the real store (323 named-branch worktrees; 122 in this repo; 72 merged PRs) — proved squash-merge breaks the git "merged" signal and that path-based generated-vs-source classification is unreliable.
Isolated-store, real-mr-binary end-to-end experiments proved cross-megarepo protection works only when the consumer is registered (a repos/ symlink alone gives zero protection), and surfaced a latent pre-existing bug: a repinned-but-unre-registered workspace's live worktree can be deleted by a concurrent GC.
No real store was mutated.

Open (tuning, captured in docs)

Timer defaults, closed-PR tier, and which mr commands must refresh the liveness record (the latent bug).

🤖 Generated with Claude Code

Posted on behalf of @schickling

field	value
`agent_name`	💓 cl1-pulse
`agent_session_id`	e08c6de8-96a5-4855-992d-3d660b68a0e3
`agent_tool`	Claude Code
`agent_tool_version`	2.1.165
`agent_runtime`	Claude Code 2.1.165
`agent_model`	claude-opus-4-8
`runtime_profile`	/nix/store/h2fzkx1acfyaidg5bmdamarf7856a2s8-coding-agent-runtime-profile/share/coding-agents/profile.json
`skills_manifest`	/nix/store/3v899lwjyzgkr7x7h4m5hlbbpn1jkbds-agent-skills-corpus/share/agent-skills/manifest.json
`worktree`	effect-utils/schickling/2026-06-10-771
`machine`	dev3
`tooling_profile`	dotfiles@unknown-dirty

Reframe #771 from artifact-pruning to safely deleting cold named-branch worktrees from the store (the dominant store accumulation that default GC cannot currently reclaim, since it blanket-protects every named ref). Captures the agreed layered-gate model as decision records 0001-0008, a glossary, and a design subsection in spec.md: - cross-megarepo live-set veto (hard) — verified end-to-end in an isolated store - lossless floor (commit reachable on remote + capture-first) - merged-PR as the primary staleness signal (git-ancestor is unusable under squash-merge) - three reclamation timers (absence / post-merge / archive retention) - capture-then-delete unified with the .archive/ worktree convention Backed by a read-only real-store survey and isolated-store experiments (no real store mutated). Implementation pending. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

github-actions · 2026-06-11T12:18:58Z

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github-actions · 2026-06-11T12:25:34Z

CI Measurements

partial - advisory gate - readiness partial (17/26 enabled observations gateable) - commit 9604d77 - protocol devenv-perf-warm-median-v2

No regressions. 1 probe got faster; 23 neutral or ungated rows are collapsed below.

SVG source

devenv / quality gates

What changed?	Group	Probe	Baseline -> current	Raw change	Impact	Confidence
faster	devenv / quality gates	Warm cached check:quick	3.632 s -> 3.248 s	-0.384 s / -10.6%	-0.61x	paired n=5, 25-75% delta -4.212 s..-0.221 s

nix / closures / packages

What changed?	Group	Probe	Baseline -> current	Raw change	Impact	Confidence
unchanged	nix / closures / packages	Nix sources closure size	0 B -> 0 B	+0 B / n/a	n/a	unknown, baseline n=23, current n=1
unchanged	nix / closures / packages	Nix sources closure size	0 B -> 0 B	+0 B / n/a	n/a	unknown, baseline n=23, current n=1
unchanged	nix / closures / packages	Nix sources closure size	0 B -> 0 B	+0 B / n/a	n/a	unknown, baseline n=23, current n=1
unchanged	nix / closures / packages	Node / pnpm closure size	0 B -> 0 B	+0 B / n/a	n/a	unknown, baseline n=23, current n=1
unchanged	nix / closures / packages	Node / pnpm closure size	0 B -> 0 B	+0 B / n/a	n/a	unknown, baseline n=23, current n=1
unchanged	nix / closures / packages	Node / pnpm closure size	0 B -> 0 B	+0 B / n/a	n/a	unknown, baseline n=23, current n=1
unchanged	nix / closures / packages	Rust closure size	0 B -> 0 B	+0 B / n/a	n/a	unknown, baseline n=23, current n=1
unchanged	nix / closures / packages	Rust closure size	0 B -> 0 B	+0 B / n/a	n/a	unknown, baseline n=23, current n=1
unchanged	nix / closures / packages	Rust closure size	0 B -> 0 B	+0 B / n/a	n/a	unknown, baseline n=23, current n=1

Unchanged / 0-impact measurements (16)

These rows had compatible baseline data, but their semantic impact rounded to 0.00x because the movement was below the configured budget, below the noise floor, or inside the robust noise band.

devenv / devenv cli

Group	Probe	Baseline -> current	Raw change	Impact	Gate	Evidence	Why hidden
devenv / devenv cli	devenv processes --help	0.019 s -> 0.02 s	+0.001 s / 5.3%	0.00x	yes	paired n=9, 25-75% delta 0 s..0.003 s	Too small to matter
devenv / devenv cli	devenv tasks list	0.042 s -> 0.041 s	-0.001 s / -2.4%	0.00x	yes	paired n=9, 25-75% delta -0.003 s..0 s	Too small to matter

devenv / devenv shell

Group	Probe	Baseline -> current	Raw change	Impact	Gate	Evidence	Why hidden
devenv / devenv shell	Warm shell eval	2.043 s -> 2.004 s	-0.039 s / -1.9%	0.00x	yes	paired n=5, 25-75% delta -0.084 s..-0.02 s	Too small to matter

devenv / genie

Group	Probe	Baseline -> current	Raw change	Impact	Gate	Evidence	Why hidden
devenv / genie	Genie check direct	6.654 s -> 6.356 s	-0.298 s / -4.5%	0.00x	yes	paired n=5, 25-75% delta -0.502 s..0.02 s	Unchanged
devenv / genie	Genie run task	1.274 s -> 1.267 s	-0.007 s / -0.5%	0.00x	yes	paired n=5, 25-75% delta -0.028 s..0.034 s	Too small to matter

devenv / quality gates

Group	Probe	Baseline -> current	Raw change	Impact	Gate	Evidence	Why hidden
devenv / quality gates	Forced check:quick	10.85 s -> 10.86 s	+0.01 s / 0.1%	0.00x	yes	paired n=3, 25-75% delta -0.169 s..0.829 s	Too small to matter

devenv / workspace setup

Group	Probe	Baseline -> current	Raw change	Impact	Gate	Evidence	Why hidden
devenv / workspace setup	pnpm install task	0.703 s -> 0.699 s	-0.004 s / -0.6%	0.00x	yes	paired n=5, 25-75% delta -0.006 s..0.001 s	Too small to matter

nix / closures / packages

Group	Probe	Baseline -> current	Raw change	Impact	Gate	Evidence	Why hidden
nix / closures / packages	Total closure size	535.4 MiB -> 535.8 MiB	+487.7 KiB / 0.1%	0.00x	yes	noise_floor, baseline n=23, current n=1	Too small to matter
nix / closures / packages	Total serialized NAR size	535.4 MiB -> 535.8 MiB	+487.7 KiB / 0.1%	0.00x	yes	within_budget, baseline n=22, current n=1	Slightly higher, ok
nix / closures / packages	Total closure size	156.3 MiB -> 156.3 MiB	+4.9 KiB / 0%	0.00x	yes	noise_floor, baseline n=23, current n=1	Too small to matter
nix / closures / packages	Total serialized NAR size	156.3 MiB -> 156.3 MiB	+4.9 KiB / 0%	0.00x	yes	within_budget, baseline n=22, current n=1	Slightly higher, ok
nix / closures / packages	Total closure path count	79 count -> 79 count	+0 count / 0%	0.00x	yes	noise_floor, baseline n=23, current n=1	Too small to matter
nix / closures / packages	Total closure path count	5 count -> 5 count	+0 count / 0%	0.00x	yes	noise_floor, baseline n=23, current n=1	Too small to matter
nix / closures / packages	Total closure path count	8 count -> 8 count	+0 count / 0%	0.00x	yes	noise_floor, baseline n=23, current n=1	Too small to matter
nix / closures / packages	Total closure size	144.4 MiB -> 144.4 MiB	+0 B / 0%	0.00x	yes	noise_floor, baseline n=23, current n=1	Too small to matter
nix / closures / packages	Total serialized NAR size	144.4 MiB -> 144.4 MiB	+0 B / 0%	0.00x	yes	noise_floor, baseline n=22, current n=1	Too small to matter

Diagnostic / ungated measurements (7)

source / effect-utils

Group	Probe	Current	Baseline	Impact	Gate	Reason	Evidence
source / effect-utils	Genie runtime lines	19809 lines	19423 lines	diagnostic	disabled	Diagnostic only	diagnostic, baseline n=24, current n=66
source / effect-utils	Genie CI workflow helpers lines	7418 lines	7318 lines	diagnostic	disabled	Diagnostic only	diagnostic, baseline n=24, current n=9
source / effect-utils	Genie runtime files	66 count	64 count	diagnostic	disabled	Diagnostic only	diagnostic, baseline n=24, current n=66
source / effect-utils	Nix workspace tools lines	3632 lines	3631 lines	diagnostic	disabled	Diagnostic only	diagnostic, baseline n=24, current n=14
source / effect-utils	Genie CI workflow helpers files	9 count	9 count	diagnostic	disabled	Diagnostic only	diagnostic, baseline n=24, current n=9
source / effect-utils	Nix workspace tools files	14 count	14 count	diagnostic	disabled	Diagnostic only	diagnostic, baseline n=24, current n=14

devenv / devenv shell

Group	Probe	Current	Baseline	Impact	Gate	Reason	Evidence
devenv / devenv shell	Shell eval with OTEL trace	27.271 s	n/a	n/a	missing_baseline	No baseline yet	missing_baseline, baseline n=0, current n=1

All measurements

Status	Gate	Target	Observation	Dimensions	Baseline	Current	Delta	Ratio	Impact
pass	yes	Dev shell	Warm cached check:quick	aggregation=median devenvRev=2cf62a010000b70f15c78a72761fad7c9e6fb47a measuredSampleCount=5 measurementProtocol=devenv-perf-warm-median-v2 otelServiceName=devenv-perf-ci pairedOrderProtocol=balanced-seeded-alternating-v1 pairedOrderSeed=27352713377-1-4500d61c416fec3f07f971a798e691976453e1d4 pairedSampleCount=5 phase=warm probe=task_check_quick_warm probeLabel=Warm cached check:quick sampleCount=11 status=0 taskCacheMode=warm warmupCount=1 workload=cached-no-op	3.632 s	3.248 s	-0.384 s	-10.6%	-0.61x
pass	yes	Genie package	Total closure size	bucket=total	535.4 MiB	535.8 MiB	+487.7 KiB	0.1%	0.00x
pass	yes	Genie package	Total serialized NAR size	bucket=total sizeKind=nar	535.4 MiB	535.8 MiB	+487.7 KiB	0.1%	0.00x
pass	yes	oxlint npm package	Total closure size	bucket=total	156.3 MiB	156.3 MiB	+4.9 KiB	0%	0.00x
pass	yes	oxlint npm package	Total serialized NAR size	bucket=total sizeKind=nar	156.3 MiB	156.3 MiB	+4.9 KiB	0%	0.00x
pass	disabled	effect-utils repository	Genie runtime lines	scope=genie_runtime	19423 lines	19809 lines	+386 lines	2%	diagnostic
pass	disabled	effect-utils repository	Genie CI workflow helpers lines	scope=genie_ci_workflow	7318 lines	7418 lines	+100 lines	1.4%	diagnostic
pass	disabled	effect-utils repository	Genie runtime files	scope=genie_runtime	64 count	66 count	+2 count	3.1%	diagnostic
pass	disabled	effect-utils repository	Nix workspace tools lines	scope=nix_workspace_tools	3631 lines	3632 lines	+1 lines	0%	diagnostic
pass	yes	Dev shell	Genie check direct	aggregation=median devenvRev=2cf62a010000b70f15c78a72761fad7c9e6fb47a measuredSampleCount=5 measurementProtocol=devenv-perf-warm-median-v2 otelServiceName=devenv-perf-ci pairedOrderProtocol=balanced-seeded-alternating-v1 pairedOrderSeed=27352713377-1-4500d61c416fec3f07f971a798e691976453e1d4 pairedSampleCount=5 phase=warm probe=genie_check_direct probeLabel=Genie check direct sampleCount=11 status=0 warmupCount=1	6.654 s	6.356 s	-0.298 s	-4.5%	0.00x
pass	yes	Dev shell	Warm shell eval	aggregation=median devenvRev=2cf62a010000b70f15c78a72761fad7c9e6fb47a measuredSampleCount=5 measurementProtocol=devenv-perf-warm-median-v2 otelServiceName=devenv-perf-ci pairedOrderProtocol=balanced-seeded-alternating-v1 pairedOrderSeed=27352713377-1-4500d61c416fec3f07f971a798e691976453e1d4 pairedSampleCount=5 phase=warm probe=shell_eval_warm probeLabel=Warm shell eval sampleCount=11 status=0 warmupCount=1	2.043 s	2.004 s	-0.039 s	-1.9%	0.00x
pass	yes	Dev shell	Forced check:quick	aggregation=median devenvRev=2cf62a010000b70f15c78a72761fad7c9e6fb47a measuredSampleCount=3 measurementProtocol=devenv-perf-warm-median-v2 otelServiceName=devenv-perf-ci pairedOrderProtocol=balanced-seeded-alternating-v1 pairedOrderSeed=27352713377-1-4500d61c416fec3f07f971a798e691976453e1d4 pairedSampleCount=3 phase=warm probe=task_check_quick_forced probeLabel=Forced check:quick sampleCount=6 status=0 taskCacheMode=refresh warmupCount=0 workload=forced-task-cache	10.85 s	10.86 s	+0.01 s	0.1%	0.00x
pass	yes	Dev shell	Genie run task	aggregation=median devenvRev=2cf62a010000b70f15c78a72761fad7c9e6fb47a measuredSampleCount=5 measurementProtocol=devenv-perf-warm-median-v2 otelServiceName=devenv-perf-ci pairedOrderProtocol=balanced-seeded-alternating-v1 pairedOrderSeed=27352713377-1-4500d61c416fec3f07f971a798e691976453e1d4 pairedSampleCount=5 phase=warm probe=task_genie_run probeLabel=Genie run task sampleCount=11 status=0 warmupCount=1	1.274 s	1.267 s	-0.007 s	-0.5%	0.00x
pass	yes	Dev shell	pnpm install task	aggregation=median devenvRev=2cf62a010000b70f15c78a72761fad7c9e6fb47a measuredSampleCount=5 measurementProtocol=devenv-perf-warm-median-v2 otelServiceName=devenv-perf-ci pairedOrderProtocol=balanced-seeded-alternating-v1 pairedOrderSeed=27352713377-1-4500d61c416fec3f07f971a798e691976453e1d4 pairedSampleCount=5 phase=warm probe=task_pnpm_install probeLabel=pnpm install task sampleCount=11 status=0 warmupCount=1	0.703 s	0.699 s	-0.004 s	-0.6%	0.00x
pass	yes	Dev shell	devenv processes --help	aggregation=median devenvRev=2cf62a010000b70f15c78a72761fad7c9e6fb47a measuredSampleCount=9 measurementProtocol=devenv-perf-warm-median-v2 otelServiceName=devenv-perf-ci pairedOrderProtocol=balanced-seeded-alternating-v1 pairedOrderSeed=27352713377-1-4500d61c416fec3f07f971a798e691976453e1d4 pairedSampleCount=9 phase=warm probe=processes_help probeLabel=devenv processes --help sampleCount=19 status=0 warmupCount=1	0.019 s	0.02 s	+0.001 s	5.3%	0.00x
pass	yes	Dev shell	devenv tasks list	aggregation=median devenvRev=2cf62a010000b70f15c78a72761fad7c9e6fb47a measuredSampleCount=9 measurementProtocol=devenv-perf-warm-median-v2 otelServiceName=devenv-perf-ci pairedOrderProtocol=balanced-seeded-alternating-v1 pairedOrderSeed=27352713377-1-4500d61c416fec3f07f971a798e691976453e1d4 pairedSampleCount=9 phase=warm probe=tasks_list probeLabel=devenv tasks list sampleCount=19 status=0 warmupCount=1	0.042 s	0.041 s	-0.001 s	-2.4%	0.00x
pass	disabled	effect-utils repository	Genie CI workflow helpers files	scope=genie_ci_workflow	9 count	9 count	+0 count	0%	diagnostic
unknown	missing_baseline	Genie package	Nix sources closure size	bucket=nix-sources	0 B	0 B	+0 B	n/a	n/a
unknown	missing_baseline	Megarepo package	Nix sources closure size	bucket=nix-sources	0 B	0 B	+0 B	n/a	n/a
unknown	missing_baseline	oxlint npm package	Nix sources closure size	bucket=nix-sources	0 B	0 B	+0 B	n/a	n/a
pass	disabled	effect-utils repository	Nix workspace tools files	scope=nix_workspace_tools	14 count	14 count	+0 count	0%	diagnostic
unknown	missing_baseline	Genie package	Node / pnpm closure size	bucket=node	0 B	0 B	+0 B	n/a	n/a
unknown	missing_baseline	Megarepo package	Node / pnpm closure size	bucket=node	0 B	0 B	+0 B	n/a	n/a
unknown	missing_baseline	oxlint npm package	Node / pnpm closure size	bucket=node	0 B	0 B	+0 B	n/a	n/a
unknown	missing_baseline	Genie package	Rust closure size	bucket=rust	0 B	0 B	+0 B	n/a	n/a
unknown	missing_baseline	Megarepo package	Rust closure size	bucket=rust	0 B	0 B	+0 B	n/a	n/a
unknown	missing_baseline	oxlint npm package	Rust closure size	bucket=rust	0 B	0 B	+0 B	n/a	n/a
pass	yes	Genie package	Total closure path count	bucket=total	79 count	79 count	+0 count	0%	0.00x
pass	yes	Megarepo package	Total closure path count	bucket=total	5 count	5 count	+0 count	0%	0.00x
pass	yes	oxlint npm package	Total closure path count	bucket=total	8 count	8 count	+0 count	0%	0.00x
pass	yes	Megarepo package	Total closure size	bucket=total	144.4 MiB	144.4 MiB	+0 B	0%	0.00x
pass	yes	Megarepo package	Total serialized NAR size	bucket=total sizeKind=nar	144.4 MiB	144.4 MiB	+0 B	0%	0.00x
missing_baseline	missing_baseline	Dev shell	Shell eval with OTEL trace	aggregation=median devenvRev=2cf62a010000b70f15c78a72761fad7c9e6fb47a measuredSampleCount=1 measurementProtocol=devenv-perf-warm-median-v2 otelServiceName=devenv-perf-ci pairedOrderProtocol=balanced-seeded-alternating-v1 pairedOrderSeed=27352713377-1-4500d61c416fec3f07f971a798e691976453e1d4 pairedSampleCount=1 phase=warm probe=shell_eval_traced probeLabel=Shell eval with OTEL trace sampleCount=2 status=0 warmupCount=0	n/a	27.271 s	n/a	n/a	n/a

Previous runs

Commit	Status	Gate	Top changes
0d2fb3c	partial	advisory	Slightly lower, ok Dev shell pnpm install task -0.143 s / -13.1% Too small to matter Dev shell Warm shell eval +0.017 s / 0.8% Too small to matter Genie package Total closure size +487.7 KiB / 0.1%
06030a8	partial	advisory	Slightly lower, ok Dev shell Genie check direct -0.214 s / -3.5% Too small to matter Genie package Total closure size +487.7 KiB / 0.1% Slightly higher, ok Genie package Total serialized NAR size +487.7 KiB / 0.1%

Source-of-truth JSON

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  "title": "CI Measurements",
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  "gate": "advisory",
  "readiness": "partial (17/26 enabled observations gateable)",
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    "attempt": "1",
    "url": "https://github.com/overengineeringstudio/effect-utils/actions/runs/27352713377"
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  "baseline": null,
  "protocol": "devenv-perf-warm-median-v2",
  "chart": {
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    "zeroImpactMeaning": "no actionable PR impact after budgets, noise floor, and robust evidence checks",
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  "measurements": [
    {
      "id": "task_check_quick_warm",
      "label": "Warm cached check:quick",
      "group": "devenv / quality gates",
      "path": [
        "devenv",
        "quality gates",
        "check:quick"
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      "groupPath": [
        "devenv",
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      "status": "pass",
      "direction": "improved",
      "gateable": true,
      "gateReason": "eligible",
      "confidence": "within_budget",
      "comparisonMode": "paired",
      "unit": "seconds",
      "baseline": 3.632,
      "current": 3.248,
      "delta": -0.3839999999999999,
      "ratio": 0.894273127753304,
      "semanticImpactScore": -0.6084801762114531,
      "semanticImpactKind": "improvement",
      "baselineSources": 5,
      "currentSamples": 5,
      "pairedSamples": 5,
      "evidenceDeltaLower": -4.212,
      "evidenceDeltaUpper": -0.221,
      "pairedEvidenceQuantile": 0.25,
      "dimensions": {
        "workload": "cached-no-op",
        "taskCacheMode": "warm",
        "probe": "task_check_quick_warm",
        "probeLabel": "Warm cached check:quick",
        "status": 0,
        "sampleCount": 11,
        "warmupCount": 1,
        "measuredSampleCount": 5,
        "pairedSampleCount": 5,
        "pairedOrderProtocol": "balanced-seeded-alternating-v1",
        "pairedOrderSeed": "27352713377-1-4500d61c416fec3f07f971a798e691976453e1d4",
        "measurementProtocol": "devenv-perf-warm-median-v2",
        "aggregation": "median",
        "phase": "warm",
        "devenvRev": "2cf62a010000b70f15c78a72761fad7c9e6fb47a",
        "otelServiceName": "devenv-perf-ci"
      }
    },
    {
      "id": "nix.closure.nar_size",
      "label": "Total closure size",
      "group": "nix / closures / packages",
      "path": [
        "nix",
        "closures",
        "packages",
        "genie",
        "total",
        "closure-size",
        "nix closure"
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      "groupPath": [
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      "status": "pass",
      "direction": "unchanged",
      "gateable": true,
      "gateReason": "eligible",
      "confidence": "noise_floor",
      "comparisonMode": "budget",
      "unit": "bytes",
      "baseline": 561373688,
      "current": 561873128,
      "delta": 499440,
      "ratio": 1.0008896747579663,
      "semanticImpactScore": 0,
      "semanticImpactKind": "neutral",
      "baselineSources": 23,
      "currentSamples": 1,
      "pairedSamples": 0,
      "evidenceDeltaLower": -10728033.76,
      "evidenceDeltaUpper": 11726913.76,
      "pairedEvidenceQuantile": 0.25,
      "dimensions": {
        "bucket": "total"
      }
    },
    {
      "id": "nix.closure.serialized_nar_size",
      "label": "Total serialized NAR size",
      "group": "nix / closures / packages",
      "path": [
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      ],
      "groupPath": [
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      "status": "pass",
      "direction": "regressed",
      "gateable": true,
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      "comparisonMode": "diagnostic",
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- 0008 already added three timers (absence/post-merge/retention) - 0009: closed-unmerged PRs count as a staleness signal (the lossless floor self-protects branches whose commits aren't reachable on a remote) - 0010: reconcile ALL registered workspaces before a destructive gc + broaden which mr commands refresh the liveness record — folding in the fix for the verified repin-without-reregister deletion bug - spec/glossary updated to match Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

…view (#771) - 0011: deterministic test seams (injected `now`, PrStateResolver service layer) + four-layer test strategy (pure / property / integration / gated e2e) - annotate 0004: capture location superseded by 0007's <repo>/.archive/ A 5-lens review of the implementation plan surfaced safety holes (wrong reachability predicate, fail-open reconcile, lost stash, archived branch blocks re-apply); these are folded into the refined plan (tmp/gc-impl/plan.md) and 0011. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

…ion ledger (#771) U1 of the cold named-branch worktree GC feature: - store-gc-config.ts: three-timer reclamation config (absence grace 14d, post-merge grace 7d, archive retention 30d) as exported defaults, with an optional `$STORE/.state/gc-config.json` merged over them; invalid/absent override falls back to defaults so the GC path never fails on a bad file. - store-fs-atomic.ts: writeFileAtomic (write-temp-then-rename) so state files are never observed half-written by a concurrent reader. - store-gc-observations.ts: cold-observation ledger (`$STORE/.state/gc-observations.json`) recording firstSeenColdAtMs per path. Newly-cold starts the clock; still-cold advances grace; no-longer-cold is dropped (no continuity laundering); unclean-reconcile paths skip grace-advance and re-arm. Atomic write, store-lock-guarded read-modify-write by the caller, corrupt file => empty (conservative re-arm). All decision + persistence paths take an explicit `now` (epoch ms); no ambient clock. Test fixtures (store-setup.ts) extended for the integration layer: - withRemote: store bare cloned/fetched from a separate upstream bare so it has real `refs/remotes/origin/*` (reachability + prune testable). - repinWorkspace: repoint a member symlink/lock WITHOUT re-registering (decision-0010 repin-bug regression seam). - createArchiveEntry: valid `.archive/<branch>--<ISO8601>/` worktree with a real gitlink for retention/reap tests. Tests: config merge, ledger transitions (incl. corrupt-file and cold->not->cold no-laundering), and fixture-primitive integration checks. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Add U2 of the cold named-branch reclamation pipeline: a branch -> GitHub PR-state resolver that supplies the primary staleness signal (decision 0005). - PrStateResolver as Context.Tag + Layer.effect; live layer shells one batched `gh pr list` per repo (Schema-validated JSON), cached per gc run. - owner/repo/host parsed from the store-relative path; non-github host, gh failure, non-JSON, or timeout all degrade to `none` (keep — absence of evidence never licenses deletion). - Branches joined to headRefName VERBATIM (names contain `/`); multi-PR per branch resolves any-open => open, else most-recent merged/closed. - Stub layer for deterministic classification tests. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Add the lossless check (U3) used to decide whether a cold named-branch worktree can be archived without losing recoverable work: - unpushedCommitCount via `git rev-list <head> --not --remotes` (not `branch -r --contains`), so a local commit stacked on a parent that lives on an unrelated remote ref still counts as unpushed (the B1 case). Requires fresh remote-tracking refs (caller fetches --prune). - hasStash via presence of the repo-global `refs/stash` ref (stashes do not travel with a worktree directory move). - assessLossless combines unpushed + dirt (Git.getWorktreeStatus) + stash into the shape the cold classifier consumes. New git helpers (revListUnpushed, hasStashRef) follow GitCommandError. Integration tests cover B1, squash-merge/deleted-remote-branch reachability, no-remote-tracking-refs conservatism, and stash detection. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

U4 of cold named-branch GC. Adds fail-safe reconcile-all to the liveness registry so a destructive gc re-derives every present workspace's live paths fresh from disk before deleting anything (decision 0010). - collectWorkspaceLivePathsStrict: surfaces read errors instead of degrading an unreadable workspace to an empty set. - collectStoreLiveSet({ reconcileAllWorkspaces, now }): on success rewrites each record (with explicit now as updatedAt); on read error KEEPS the existing record (never overwrites a non-empty record with empty, B2) and flags it via StoreLiveSet.uncleanReconcilePaths so grace is not advanced; prunes a record only when the workspace dir is gone. - refreshWorkspaceRegistry.updatedAt is now an explicit `now` (epoch ms) seam; the wall clock is read only at the CLI edge. - Broaden refresh: pin (both repin and pin-to-commit paths) now refreshes the workspace registry, closing the verified repin-without-reregister bug; apply already refreshed via the sync engine. Tests: repin-without-reregister regression, present-but-unreadable workspace keeps its live paths, gone-workspace pruning. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

#771) U6 of the cold named-branch reclamation work. Adds src/lib/store-archive.ts: - archiveWorktree: mkdir the .archive parent first, then `git worktree move` (dirty + untracked work travels intact, gitlink fixed), FREE the branch via `git branch -D` so re-apply can re-materialize it (invariant 4), and append a metadata line to .archive/README.md. `now` is an explicit epoch-ms param. - scanArchives: enumerate via Git.listWorktrees filtered to .archive/ paths, parsing archivedAtMs from a strict anchored trailing `--<ISO8601>` segment (branch names contain -/--//, parsed relative to .archive/). - reapArchive: `git worktree remove --force`, then ensure the dir is gone. Adds a Git.deleteBranch helper (`branch -d/-D`). Integration tests cover: archive preserves dirty+untracked; branch freed + re-add succeeds; scan/ retention split; reap removes dir + unregisters from the worktree registry. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Add classifyColdWorktree (pure) to store-worktree-policy: a tagged keep/archive decision over a fixed gate order — liveness veto, staleness evidence, lossless floor, absence grace, merged-only post-merge grace, then archive (closed has no post-close grace). Explicit now epoch-ms; classifyStoreWorktreePolicy left untouched. Tests: gate-precedence table + near-misses, and FastCheck property invariants (live never archives; open/none keep; unpushed>0 keeps; hasStash keeps). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Integrate the cold reclamation path (U7/U7b, decisions 0001–0010) into the default `mr store gc` flow. Additive third path; `--all` semantics unchanged. - reconcile-all the live set ONCE and thread it; re-check the liveness veto under `withWorktreeLock` against a fresh reconcile immediately before BOTH archive and reap (invariant 1) - per repo: fetchBare first (failure => keep all its named worktrees); resolve PR state adjacent to classification; record cold observations once (store- global ledger, under lock); classify each named worktree; ref_mismatch (HEAD on a different branch) => keep - archive decisions: archive => verify => free branch; failure => keep + error - scan archives and reap entries past the retention TTL, each under lock + veto - PrStateResolver is injected when present (stub layer in tests), else the live gh-shelling layer is built in the command Extend StoreGcResult.status with archived/reaped/kept plus reason and an optional recoverPath (intentional, documented JSON contract change) across the schema, view renderer, fixtures, and stories. Add an end-to-end integration suite covering the full matrix: registered vs unregistered, repin-without-reregister, present-but-unreadable workspace, merged+clean=>archived (branch freed, re-add works), merged+dirty, merged+stash, merged+unpushed, open, squash+remote-deleted, grace cases, retention reap, veto-at-reap, dry-run, and --all unchanged. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

…elog (#771) Flip the spec's cold named-branch reclamation subsection from designed-not-implemented to the shipped behavior: layered gate order (live-set veto, staleness, lossless floor, three grace timers, archive then reap), config override path, reconcile-all-before-delete fail-safe semantics, and the new --json statuses (archived/reaped/kept + reason + recoverPath). Add an [Unreleased] CHANGELOG entry for the feature. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

schickling-assistant · 2026-06-11T15:43:27Z

Implementation landed (verified)

The design (decisions 0001–0011) is now implemented across 8 milestone commits (~4.7k insertions, 31 files).

New libs: store-gc-config, store-fs-atomic, store-gc-observations, store-pr-state (PrStateResolver service), store-lossless, store-archive; reconcile-all + broaden-refresh in store-liveness; classifyColdWorktree in store-worktree-policy; gc wiring + new output statuses (archived/reaped/kept) in store gc.

Independently verified (not just the agents' word):

dt ts:check green (repo-wide); 582/582 megarepo tests pass; oxlint 0 errors; oxfmt clean.
Named regression tests present & passing for every blocker the plan review caught:
- B1 rev-list --not --remotes (local commit on unrelated-remote-contained parent ⇒ unpushed)
- B2 reconcile-all fail-safe (present-but-unreadable workspace keeps last-known) + repin regression (0010)
- B3 stash guard ⇒ keep
- B4 archive frees the branch ⇒ mr apply-equivalent re-add succeeds
Archive and reap run under withWorktreeLock with a fresh re-reconciled live-set veto re-check (TOCTOU); dry-run mutates nothing; archive failure leaves the original intact.

Folded into default mr store gc (decision 0006); --all semantics unchanged. An adversarial review over the implementation diff is running next.

Posted on behalf of @schickling

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…#771) Fix findings from an adversarial review of the cold named-branch worktree GC reclamation path in `mr store gc`. - B1 (blocker): `archiveWorktree` freed no branch for production worktrees. A production `refs/heads/*` worktree is non-detached, so after `git worktree move` the moved worktree still has the branch checked out and `git branch -D` is refused (`cannot delete branch used by worktree`), leaving the branch unfreed and a later `mr apply` re-add broken (invariant 4). Detach the moved worktree's HEAD (new `Git.detachWorktreeHead`) before freeing the ref. Added an integration test using a non-detached worktree (prior fixtures only used `--detach`, masking the defect) — it fails before the fix, passes after. - M1 (major): route both liveness-registry writes (`refreshWorkspaceRegistry`, under-lock reconcile rewrite) through `writeFileAtomic` so a torn read during a concurrent gc reconcile can't drop a workspace's live-set veto (decision 0010 hard veto). - B1-followup (major): once the move succeeds, report `archived` with the real `recoverPath`; post-move branch-free + README steps are best-effort-but-reported via a warning (no false `error`/"left intact"). The `.archive/README.md` append is now an atomic write. - n1: drop the unreachable `winner === undefined` branch in `resolvePrStateForBranch`. New tests: archive-time live-set veto re-check; `loadStoreGcConfig` valid + corrupt-file degradation; CLOSED-PR archive (reason `closed`, no post-close grace); dry-run reap intent; unclean-reconcile grace withholding/restart; `writeFileAtomic` temp-cleanup on a rename failure. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

schickling-assistant · 2026-06-11T16:17:21Z

Adversarial implementation review + hardening (round 2)

A 3-lens review over the implementation diff found one real bug the tests masked, plus atomicity/coverage gaps. All fixed in 5f4fcb3c:

B1 (blocker) — git branch -D is refused after git worktree move for non-detached (i.e. production) refs/heads worktrees, so the branch was never freed and mr apply couldn't re-materialize it. The whole fixture suite used --detach, masking it. Fix: detach the moved worktree's HEAD before deleting the branch; added a non-detached production-shape regression test (fails before, passes after).
M1 — liveness registry writes routed through writeFileAtomic (a torn read during concurrent reconcile could drop a workspace's veto).
Reporting — once the move succeeds the result is archived + recoverPath, not a misleading error.
Coverage added — archive-time veto re-check, config load/corrupt-degradation, closed-PR→archive, dry-run reap intent, unclean-reconcile grace withhold/restart, atomic-write cleanup.

The review positively verified the core logic (gate ordering, PrStateResolver R-channel closure, single-clock discipline, strict-vs-lenient reconcile, reap-veto, fetch-fail→keep).

Independently re-verified: dt ts:check green; megarepo vitest green (29 files); oxlint 0 errors; oxfmt clean.

Posted on behalf of @schickling

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`agent_model`	claude-opus-4-8
`runtime_profile`	/nix/store/h2fzkx1acfyaidg5bmdamarf7856a2s8-coding-agent-runtime-profile/share/coding-agents/profile.json
`skills_manifest`	/nix/store/3v899lwjyzgkr7x7h4m5hlbbpn1jkbds-agent-skills-corpus/share/agent-skills/manifest.json
`worktree`	effect-utils/schickling/2026-06-10-771
`machine`	dev3
`tooling_profile`	dotfiles@unknown-dirty

github-actions Bot added a commit that referenced this pull request Jun 11, 2026

Update CI measurement chart SVG for PR #780

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github-actions Bot added a commit that referenced this pull request Jun 11, 2026

Update CI measurement chart PNG for PR #780

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github-actions Bot added a commit that referenced this pull request Jun 11, 2026

Update dark CI measurement chart PNG for PR #780

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github-actions Bot added a commit that referenced this pull request Jun 11, 2026

Update CI measurement chart SVG for PR #780

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github-actions Bot added a commit that referenced this pull request Jun 11, 2026

Update CI measurement chart PNG for PR #780

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github-actions Bot added a commit that referenced this pull request Jun 11, 2026

Update dark CI measurement chart PNG for PR #780

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github-actions Bot added a commit that referenced this pull request Jun 11, 2026

Update CI measurement chart SVG for PR #780

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github-actions Bot added a commit that referenced this pull request Jun 11, 2026

Update CI measurement chart PNG for PR #780

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github-actions Bot added a commit that referenced this pull request Jun 11, 2026

Update dark CI measurement chart PNG for PR #780

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schickling-assistant and others added 8 commits June 11, 2026 16:19

schickling-assistant changed the title ~~docs(megarepo): design for cold named-branch worktree GC (#771)~~ feat(megarepo): cold named-branch worktree GC (#771) Jun 11, 2026

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feat(megarepo): cold named-branch worktree GC (#771)#780

feat(megarepo): cold named-branch worktree GC (#771)#780
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schickling-assistant commented Jun 11, 2026

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github-actions Bot commented Jun 11, 2026 •

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devenv / devenv cli

devenv / devenv shell

devenv / genie

devenv / quality gates

devenv / workspace setup

nix / closures / packages

source / effect-utils

devenv / devenv shell

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schickling-assistant commented Jun 11, 2026

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schickling-assistant commented Jun 11, 2026

What's here

Agreed model (gates, in order, folded into default mr store gc)

Evidence

Open (tuning, captured in docs)

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Storybook Previews

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CI Measurements

devenv / quality gates

nix / closures / packages

devenv / devenv cli

devenv / devenv shell

devenv / genie

devenv / quality gates

devenv / workspace setup

nix / closures / packages

source / effect-utils

devenv / devenv shell

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schickling-assistant commented Jun 11, 2026

Implementation landed (verified)

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schickling-assistant commented Jun 11, 2026

Adversarial implementation review + hardening (round 2)

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Agreed model (gates, in order, folded into default `mr store gc`)

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