docs(board): OQ-MBX-7..14 — #418 follow-up findings catalogue

[AdaWorldAPI]

Summary

Parallel-session FINDINGS/INPUT review of #418
(bindspace-singleton-to-mailbox-soa-v1). Single new file
.claude/board/oq-catalog-mbx.md (304 lines); no source, no plan-doc, no
STATUS_BOARD edits.

Each entry is a question for the owning sessions (plan-author session;
D-MBX-1..6 worker sessions). Three valid resolutions per OQ, all useful as
calibration: covered-elsewhere / real-gap-queue / wrong-framing. Numbering
continues the plan's §8 (OQ-1..4) into OQ-MBX-7..14, so plan-§8 + this
file form one logical catalogue.

Highest-value finding

OQ-MBX-8 — persisted_row semantics under Lance versioning. The plan
§2.5 claim "ShaderCrystal.persisted_row is a pointer to the same SoA row
laid down in Lance" is forward-looking: REFACTOR_NOTES.md:129 states
"BindSpace is in-memory only. EmitMode::Persist sets persisted_row in
the crystal but doesn't write to disk.", and driver.rs:458 records the
in-RAM top_k[0].row. D-MBX-4 (death → SPO-G quad + Lance tombstone-witness)
is the deliverable that has to make §2.5 true; row-identity semantics
under Lance MVCC / compaction need to be pinned before D-MBX-4 picks
a type, or the tombstone back-pointer breaks across the first compaction.

The 8 OQs (one-line each)

#	Question	Sev	Owner
OQ-MBX-7	#[repr(C)] byte-pin on MailboxSoA<N> itself?	P0	plan §2 / D-MBX-1
OQ-MBX-8	persisted_row semantics under Lance versioning	P0	plan §2.5 / D-MBX-4
OQ-MBX-9	ThinkingStyleI4_32D placement (column / projection / param)	P1	plan §3 / D-MBX-1
OQ-MBX-10	Sea-star concurrency: Send, container shape, access model	P1	plan §6 / D-MBX-3
OQ-MBX-11	Mailbox eviction policy at the 64k–256k ceiling	P1	plan §2.7 / D-MBX-3
OQ-MBX-12	S1 dual-path discipline + field-isolation-matrix tests	P1	plan §6 / D-MBX-1..2
OQ-MBX-13	BE-endianness policy for the LE contract	P2	plan §2.5
OQ-MBX-14	Baton u16 ↔ HHTL cascade-address encoding?	P3	PP-15 audit input

Survey-gate provenance (run before authorship)

• Open-PR overlap: clean — only A2A coordination blackboard — DO NOT MERGE #261 (draft blackboard).
• Prior-art grep per OQ: cited inline (#[repr(C)] precedent on
  SoaContainerHeader/RungState/OntologyDelta; persisted_row
  write-path-unbuilt evidence at REFACTOR_NOTES.md:129; ThinkingStyleI4_32D
  basis already settled in EPIPHANIES.md:234+ but unplaced in §3; etc.).
• Out-of-scope catches: Libet wall-clock budget rejected before
  authorship — .claude/surreal/cognitive-substrate.md:49-51 already rules
  "Keep the phase structure; reject the neuro-numerology."
  TD-RESONANCEDTO-DUP-1 severity re-rate closed before authorship —
  verified P3 stands (separate modules dto:: vs awareness_dto::, no
  collision; crate compiles).

Test plan

• Docs only — no .rs / Cargo.toml / build.rs / data/ changes;
  no edits to bindspace-singleton-to-mailbox-soa-v1.md (owned by the
  plan-author session); no STATUS_BOARD modification.
• Survey gate (open PRs, prior-art greps, sprint-log shape convention)
  run before authorship; results cited in the catalogue preamble + per OQ.
• No deliverables or D-MBX-7+ items proposed by this PR — those are
  the owning session's calls. Findings are input; deliverables are output.

https://claude.ai/code/session_018FqA8TfgRBHy8zF92kx4TW

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Generated by Claude Code

Summary by CodeRabbit

• Documentation
  • Added internal documentation board entry with question specifications and tracking information.

Note: This update is internal documentation only and does not affect product functionality or user experience.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 7a41a563-6c5e-4fe4-8b12-f31002fbf083

📥 Commits

Reviewing files that changed from the base of the PR and between 0754a76 and 179e6c6.

📒 Files selected for processing (1)

• .claude/board/oq-catalog-mbx.md

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📝 Walkthrough

Walkthrough

This PR adds a new OQ catalogue markdown file documenting eight interconnected survey questions about MailboxSoA design, storage semantics, concurrency discipline, and eviction policies. The document establishes conventions for routing resolutions and provides indexed entries with detailed motivation, cross-references, and plan-block ownership for each question.

Changes

OQ Catalogue Survey

Layer / File(s)	Summary
Document purpose and index .claude/board/oq-catalog-mbx.md	Introduces the findings/input catalogue role, establishes numbering and routing conventions for question resolution, and provides an index table mapping eight survey questions (OQ-MBX-7 through OQ-MBX-14) to their severity and ownership blocks.
Survey questions OQ-MBX-7 through OQ-MBX-14 .claude/board/oq-catalog-mbx.md	Defines eight interconnected questions covering MailboxSoA byte layout enforcement, persisted_row semantics under Lance versioning, ThinkingStyleI4_32D placement strategy, post-S3 concurrency container shape, eviction signal/policy thresholds, feature-gated S1 dual-path interaction, big-endian contract policy, and baton u16 encoding scheme—each with rationale, prior-art cross-references, and associated plan deliverable blocks.
Resolved and not-filed items .claude/board/oq-catalog-mbx.md	Records closure of prior survey items, including a verified severity re-rate and reference to the Libet wall-clock budget closure.

🎯 1 (Trivial) | ⏱️ ~5 minutes

🐰 Eight questions posed with care,
From MailboxSoA's layout fair—
Byte paths and evictions bright,
Survey findings in the night,
Planning brought to gleaming light!

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly identifies the main change: adding OQ catalogue entries (OQ-MBX-7..14) as a follow-up to PR #418, which matches the documentation file added (.claude/board/oq-catalog-mbx.md).
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch claude/418-followup-findings

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