gov: #422 post-merge — LATEST_STATE row + PR_ARC_INVENTORY entry

[AdaWorldAPI]

Summary

Post-merge board hygiene for #422 (docs(handover): PR #418/#419 review + surreal/mailbox/Baton/SoA-as-BindSpace-surrogate plan map, merged commit 984512b on top of doc commit a29946b). #422 itself was a read-only handover that didn't anticipate its own merge row; this PR mirrors the established post-merge governance pattern (cf. #354 → #353).

Net change: 2 files, +43 lines, append-only. Zero code touched.

Entries added (via tee -a — Edit/Write denied on bookkeeping files)

• .claude/board/LATEST_STATE.md — dated append section with the new top-of-table row for docs(handover): PR #418/#419 review + surreal/mailbox/Baton/SoA-as-BindSpace-surrogate plan map #422 (matches the existing ## 2026-05-07 — Append: lance-graph-ontology shipped pattern; the dated framing preserves the reverse-chronological reading).
• .claude/board/PR_ARC_INVENTORY.md — full per-PR arc entry for docs(handover): PR #418/#419 review + surreal/mailbox/Baton/SoA-as-BindSpace-surrogate plan map #422 (Status / Added / Locked / Deferred / Docs / Confidence). Locks in two readings as canonical:
  • The SurrealDB role correction (Zone-2 cold store → view over leading LanceDB) from E-RUBICON-RACTOR + plan bindspace-singleton-to-mailbox-soa-v1 §2.7. Consequence: surreal_container (BLOCKED A/B/C/D) is optional, not on the D-MBX-6 critical path.
  • The two-figure footprint distinction for the mailbox-SoA migration: bare migrated columns ≈ 24–50 B/row vs full hot thought ≈ ~6 KB/row (Hamming planes stay hot). The 64k–256k thought · 300–600 MB hot ceiling derives from the latter.

Explicit deferrals (carried over from #422, recorded in the PR_ARC entry)

• The .claude/surreal/SUPERSEDURE_NOTE_2026-05-27.md pointer file the navigability finding E-SURREAL-POC-UNANNOTATED-SUPERSEDURE names as the lowest-risk fix.
• A sibling handover persisting the earlier lance-graph-ontology crate review + UnifiedBridge migration-status findings (user chose "findings report only" during the session; not persisted unless re-requested).
• The CLAUDE.md "The Click" doctrinal rewrite off Vsa16kF32 (OQ-4) — gates D-MBX-5; out of scope.

Note on the anti-pattern

CLAUDE.md names "retroactive-hygiene commit (merge PR → later cleanup commit)" as an anti-pattern. The ideal would have been to ship these entries in #422 itself; #422's docs-only/read-only framing didn't anticipate its own merge row, so this is the next-best fix mirroring #354's precedent. Future handovers should include their own LATEST_STATE row + PR_ARC entry in the same PR.

Test plan

• Append-only governance respected (tee -a only; existing entries unchanged).
• Dated framing preserves the reverse-chronological reading on both files.
• No .rs / Cargo.toml / build.rs / data/ touched; no build expected.

https://claude.ai/code/session_01FMooFcE7hgRWWvknNr2N4i

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Generated by Claude Code

Summary by CodeRabbit

• Chores
  • Updated internal governance and inventory documentation records with no impact to user-facing functionality or features.

[coderabbitai]

Caution

Review failed

Pull request was closed or merged during review

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: 0fa0f243-5f2e-4312-8222-261a99376957

📥 Commits

Reviewing files that changed from the base of the PR and between 984512b and ae1ef98.

📒 Files selected for processing (2)

• .claude/board/LATEST_STATE.md
• .claude/board/PR_ARC_INVENTORY.md

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📝 Walkthrough

Walkthrough

This PR appends governance board documentation for PR #422, a completed docs-only handover of PR #418/#419 review. It adds a "Recently Shipped PRs" entry to LATEST_STATE.md and a corresponding PR_ARC_INVENTORY section tracking the merged status, handover deliverable, and locked conventions.

Changes

Governance Board Updates

Layer / File(s)	Summary
Recently Shipped PRs and PR_ARC inventory .claude/board/LATEST_STATE.md, .claude/board/PR_ARC_INVENTORY.md	PR #422 is recorded as a merged, docs-only handover covering PR #418/#419 review. LATEST_STATE.md adds a new top-row entry to the shipped PRs table with title and handover file path. PR_ARC_INVENTORY.md appends a detailed section documenting branch metadata, handover deliverable, locked conventions on SurrealDB/LanceDB choice and mailbox-SoA footprint reading, and the E-RUBICON-RACTOR framing.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Possibly related PRs

• AdaWorldAPI/lance-graph#422: Companion PR containing the handover content itself, including the mapped handover document and corresponding updates to AGENT_LOG.md and EPIPHANIES.md that this PR #424 references in its board indexes.

Poem

🐰 A board update hops along,
Recording handovers done and done,
PR #422 finds its place,
In governance's careful embrace!
Conventions locked, decisions made—
The rabbit's ledger, perfect and laid. ✨

🚥 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 accurately describes the main change: documenting post-merge governance bookkeeping for PR #422 by adding entries to LATEST_STATE.md and PR_ARC_INVENTORY.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/lance-graph-ontology-review-Pyry3

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