shard(2307Z-c): brief-ack #1

[AceHack]

Brief-ack #1 named-dep #4242 + #4241 CI wait.

[chatgpt-codex-connector]

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[Copilot]

Pull request overview

Adds a new hygiene-history tick shard for 2026-05-18 2307Z-c to record brief-ack #1 status while waiting on CI for #4242 and #4241.

Changes:

• Introduces docs/hygiene-history/ticks/2026/05/18/2307Z-c.md capturing the tick’s metadata line plus a short status log.

[AceHack]

Known Copilot table-prefix-misread FP class per blocked-green-ci-investigate-threads.md 'Suspect-by-default Copilot finding classes':

Direct awk 'NR==1 { print NR": ["$0"]" }' docs/hygiene-history/ticks/2026/05/18/2307Z-c.md confirms the line is:

1: [| 2026-05-18T23:07Z | opus-4-7 / autonomous-loop | de1e7f5d | brief-ack #1 named-dep #4242 + #4241 CI wait; #4240 merged; thread-clean | -- | post-pre-empt quiet |]

— correctly formatted per the 6-column pipe-row schema. Copilot's claim of 'numeric prefix and ||' is the documented FP class where the PR-diff line-number rendering gets misread as line content. Pre-push lint (bun tools/hygiene/check-shard-before-push.ts) passed cleanly. Resolved no-op.