Board: record PR #1234 merged (74f6302) — the mixed-PR arc entry

[AdaWorldAPI]

Hygiene-only — the merged-PR obligation for #1234

One commit, two files, +131 / −0, both PREPENDS. #1234 was mixed (hygiene + three retractions), so per CLAUDE.md's termination clause it earns its own arc entry rather than being discharged by the entries it wrote. This is that entry.

• .claude/board/PR_ARC_INVENTORY.md — the Storno: there is no residue in Hexagon — and the retraction of a deprecation I had no authority to make #1234 arc entry.
• .claude/board/LATEST_STATE.md — the merged-PR row, again with an explicit no contract inventory delta, plus the standing state corrections a consumer needs (HelixResidue is one 48-bit Signed360 on the HHTL axis, not a Hexagon synapse lane; the learning lanes are 6 × 2 × palette256; the shipped plasticity is PlasticityState at CausalEdge64[50:52]; MailboxSoA::promote_family does ship).

What the entry records

Not a rule — one move, made six times: transfer a property across a boundary on the strength of a shared surface feature.

#	shared feature	transferred	caught by
1	6 B == 6 rails	helix residue → a Hexagon synapse surface	operator
2	48 bit == 48 bit	cam_pq's measured ranking → HelixResidue	Codex
3	"multi-hop"	synthetic-SPD concentration → graph-traversal recall	Codex
4	the word "plasticity"	an unwritten tenant → a deprecation verdict	operator
5	"I grepped one file"	absent ×3, wrong ×3	operator ×2, Codex ×1
6	—	the rule written to prevent 1–5, restating 5 as advice	CodeRabbit

Rows 2, 3 and 6 happened inside the correction. A correction written in the same voice that produced the error reproduces the error's operating move.

Two rules locked: report state, don't grade someone else's architecture; and before claiming A tells you about B, name the measurement that ranged over B.

Also recorded, in the same discipline the findings enforce in the other direction: Codex cited a D-HXP-7 requirement "through n=14" that is not in the plan — plan and board row both say n ≥ 10. Marked unverified rather than echoed.

Provenance of the restart

Branch restarted from origin/main only after git merge-base --is-ancestor 5ce1008 origin/main returned YES and git log origin/main..HEAD came back empty — the #1217 rule, applied to its own restart. #1234 merged by merge commit, so the push was a fast-forward.

Gates (local, ddfdbf3)

append_only_gate origin/main OK, 9 files, none shrank · citation_decay --since 74f6302 0 new · supersession_index regenerated after the board writes, byte-identical.

Termination clause

This PR's entire content is board hygiene for a prior PR: no type, plan, deliverable, epiphany, or code. On merge it generates no arc entry and no LATEST_STATE update. The chain stops here.

🤖 Generated with Claude Code

https://claude.ai/code/session_011JRoXmYPrE8KubXVrDB71L

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Generated by Claude Code

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Reviewing files that changed from the base of the PR and between 74f6302 and ddfdbf3.

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

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