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shard(tick): 1349Z — 2nd Copilot cat-n P0 false positive cleared #3489

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Merged
AceHack merged 2 commits into from
May 15, 2026
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shard(tick): 1349Z — 2nd Copilot cat-n P0 false positive cleared #3489

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shard(tick): 1349Z — 2nd Copilot cat-n P0 false positive cleared
AceHack May 15, 2026
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fix(shard): close (PR TBD) → (PR #3489)
AceHack May 15, 2026
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8 changes: 8 additions & 0 deletions docs/hygiene-history/ticks/2026/05/15/1349Z.md
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Original file line number Diff line number Diff line change
@@ -0,0 +1,8 @@
| 2026-05-15T13:49:00Z | claude-opus-4-7 | 596e842c | shard: 2nd Copilot cat-n P0 false positive on PR #3485 cleared | (PR #3489) | recurring-FP class |

# Tick 1349Z

- PR #3485 (1343Z shard): SECOND instance of the cat-n line-number Copilot P0 false-positive (claim `1 ||` line 1; actual file byte 0 is `|`). Identical to the catch documented in PR #3483 shard 1340Z. Now a recurring class.
- PR #3488 (1345Z shard): wait-CI, 0 threads.
- Pattern observation: Copilot reads files in cat -n format and at least sometimes misinterprets the line-number prefix `1<TAB>|` as content `1 ||`. The error rate doesn't appear correlated with file content; expect this to recur on tick shards (1-line pipe-row at line 1 is the trigger).
- Cron sentinel `596e842c` armed.
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