shard(2311Z-c): Copilot FP on #4243 resolved

docs/hygiene-history/ticks/2026/05/18/2311Z-c.md

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+| 2026-05-18T23:11Z | opus-4-7 / autonomous-loop | de1e7f5d | resolved Copilot FP on #4243 (table-prefix-misread); #4244 + #4243 merged; #4243 thread no-op | -- | known FP class per blocked-green-ci rule |
+
+# Tick 2311Z-c — 2026-05-18
+
+## Refresh + thread-investigation
+
+- graphql 3961; main `29fd2fb`
+- #4244 (last shard) MERGED CLEAN
+- #4243 (2307Z-c shard) MERGED but with 1 unresolved Copilot thread
+
+## Substantive (thread-investigation catch)
+
+**Copilot table-prefix-misread FP on #4243** — claimed first line had "numeric prefix and `||`"; direct `awk` confirms line is correctly formatted 6-column pipe-row per schema. Known FP class per [`blocked-green-ci-investigate-threads.md`](../../../../../../.claude/rules/blocked-green-ci-investigate-threads.md) "Suspect-by-default Copilot finding classes" (PR-diff line-number rendering gets misread as line content).
+
+Thread resolved no-op + explanatory comment posted naming the FP class.
+
+This is the substrate-honest pattern operating: post-merge thread-investigation catches Copilot FPs same as it catches real findings; the rule's FP catalog gets the no-op verdict; the explanatory comment makes the FP class visible to future readers.
+
+## Counter
+
+Reset by concrete artifact (thread resolution + explanatory comment + this shard).
+
+## CronList
+
+de1e7f5d alive.
+
+## Visibility-stop
+
+End of tick.