hygiene(tick-history): Tick-87 shard — 7 review-bugs caught + fixed pre-merge across 3 PRs#1210
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…ht + fixed pre-merge across 3 PRs Opened immune-system memory file via PR #1209. External graders caught 7 real bugs across PRs #1207/#1208/#1209: empty-dir exit-1, zero-padded octal-parse, midnight-UTC blind window, mixed-format sort drift, env-var validation, MEMORY.md pairing, phantom xref. All addressed pre-merge. The immune system the human maintainer just named IS the worked example. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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Pull request overview
Adds a new tick-history shard for Tick-87 (2026-05-02 17:28Z) documenting the “immune system” worked example: 7 review-caught bugs across PRs #1207–#1209 were fixed pre-merge.
Changes:
- Adds a new per-tick shard entry under
docs/hygiene-history/ticks/2026/05/02/. - Records the set of external-grader findings and the follow-up status for the tick.
…ticks Three Copilot findings on PR #1210: 1. **P1 count inconsistency**: bolded summary said "5 review-bugs" but the rest of the row + PR title + commit message say 7. Fixed to 7 throughout. 2. **P0 GFM-table pipe corruption**: `ls | grep` inside backticks still splits the column in GFM table rendering (escape-with- backslash inside code spans is inconsistently handled across renderers). Cleanest fix: rephrase to avoid the pipe entirely — "the `ls`-piped-to-`grep` pipeline" reads naturally and produces no extra column dividers. 3. **P0 schema-violation**: same root cause as #2 — the unescaped pipe was producing 9 awk-fields (8 pipes), failing the 6-column schema requirement. Now 8 fields (7 pipes) = 6 columns. Verified with `tools/hygiene/check-tick-history-shard-schema.sh`. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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Summary
Tick-history shard for Tick-87 documenting the immune-system worked-example: across this tick's three PRs (#1207, #1208, #1209), external graders caught 7 real bugs that were all addressed pre-merge.
ls | greppipeline dies underset -euo pipefailon empty-match08but bash arithmetic parses as invalid octaltail -n foofails underset -edefeating informational-only promiseThe cycle Aaron just named — "branch protections + PR process + checks ARE the immune system" — IS the worked example.
Test plan
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