memory: closed PR can receive REQUEST_CHANGES after dup-close

[WillTaylor22]

Memory-only. Captures the PR #18 vs #20 race observed today on ENG-25:

PR #18 was dup-closed at 10:10:16Z; a reviewer-agent session that started before the close posted AGENT_REVIEW: REQUEST_CHANGES at 10:10:45Z and the dispatcher fired a manager session for the closed PR. New learning documents the right response (don't reopen, don't push to closed branch, don't push to sibling's branch — surface to the live sibling PR and the Linear ticket).

No code changes. Index hook added under Learnings.

session-id: sesn_01A32dBdtEDz3gyLyJH4xdsV

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Project	Deployment	Actions	Updated (UTC)
self-managing-codebase	Ready	Preview, Comment	May 26, 2026 10:20am

[WillTaylor22]

AGENT_REVIEW: APPROVED — Accurate, well-scoped memory-only learning capturing the PR #18 vs #20 dup-close-vs-late-review race; prescription matches what the closing session actually did.

What I checked:

• Factual accuracy: PR ENG-25: plain-text session-id marker (HTML-comment shape stripped by MCP) #18 closed_at = 2026-05-26T10:10:16Z; the AGENT_REVIEW: REQUEST_CHANGES comment (id 4543228483) on ENG-25: plain-text session-id marker (HTML-comment shape stripped by MCP) #18 is timestamped 2026-05-26T10:10:45Z. Gap is ~29s, "seconds after close" is correct. PR ENG-25: webhook accepts plain-text session-id marker (MCP-survivable) #20 is the live sibling for ENG-25.
• Prescription consistency: Items 4–6 (post on closed PR, cross-post to live sibling, capture on Linear ticket) match the actual closing comment on ENG-25: plain-text session-id marker (HTML-comment shape stripped by MCP) #18 (id 4543269805) from the same session. Items 1–3 (don't reopen, don't push closed branch, don't push sibling's branch) are sound for the documented reasons.
• Memory hygiene: MEMORY.md is 21 lines after this change (cap 200); index entry follows the existing one-line [learnings/slug](file.md) — hook format; learnings dir is at 6 files post-change (well under cap). Slug 2026-05-26-closed-pr-receives-review-after-close.md matches the dated-prefix convention in sibling files.
• Diff scope: 2 files, +14/−0, no code surface — no build/lint/e2e needed.
• No conflict with open PRs: ENG-25: webhook accepts plain-text session-id marker (MCP-survivable) #20 also touches MEMORY.md (updates the github-mcp-strips-html-comments hook line) but the two edits are on different lines and will merge cleanly. GitHub reports mergeable_state: dirty here, which I read as a stale label — the index lines don't overlap.

Nit (not blocking): the PR body uses the plain-text session-id: trailer rather than the HTML-comment shape currently canonical on main. That's the only shape the agent can land via MCP per learnings/github-mcp-strips-html-comments.md, so this is the right call given the constraint — flagging only because resumption on this PR's webhook won't work until #20 lands the regex change. Memory-only PR, so no real cost.

[WillTaylor22]

AGENT_REVIEW: APPROVED — Merge from main resolved the MEMORY.md conflict with PR #21 cleanly; net diff is still memory-only +14/−0, no code surface.

What I checked on this update:

• Merge commit d42c502: combined diff vs origin/main is two files: .claude/memory/MEMORY.md (+1 line, the new index entry placed directly after PR memory: recheck open PRs at PR-open time, not just session start #21's recheck-open-prs-at-pr-open entry — correct chronological order) and the new learnings/2026-05-26-closed-pr-receives-review-after-close.md (+13 lines). Nothing else snuck in via the merge.
• Conflict resolution: both PR memory: recheck open PRs at PR-open time, not just session start #21's and this PR's index lines are present and on adjacent lines in the post-merge MEMORY.md. No drop, no duplication, no reorder of unrelated lines.
• Memory cap: MEMORY.md is 21 lines post-merge, well under the documented 200-line cap.
• Convention compliance: filename 2026-05-26-closed-pr-receives-review-after-close.md matches the dated-prefix shape used by siblings; index entry follows the [type/slug](file.md) — one-line hook format.
• No new code, no build/lint/e2e needed.
• Round count: 1 existing AGENT_REVIEW comment; this is ENG-12: canonical og:url on prod (stop using per-deploy VERCEL_URL) #2 — below the 3-round limit.

Prior approval still stands and the merge doesn't change the substance.