goldstandard: destructive-prepend prohibition as knowledge law + PreToolUse hook - #1084
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… law + hook Applies the Goldstandard board standards to #1083's rule, which had landed only as a CLAUDE.md block: - .claude/knowledge/never-truncate-a-file-you-still-need-to-read.md — title IS the rule; READ BY: header; Status CONTRACT locked 2026-08-30 with the operator's verbatim words; incident with evidence class (observed) and receipts (#1081 truncation, #1082 restore 82679c3, blob cdf8c15^1); machine-runnable falsifier (wc -l, shorter=defect) with its does-not-prove ceiling; retrieval footer. - CLAUDE.md: the 19-line P0 block trimmed to a 9-line pointer at the law (size rule: CLAUDE.md links out, absorbs no state). - hooks/anti-pattern-matching.sh: non-blocking PreToolUse guard now injects the rule when a Bash command combines open-for-write with .read() in one expression ('a falsifier without a hook is a hope'). Header cites its founding incident. Tested red-then-green: first regex missed the escaped-quote form (guard failed to fire — fixed); final form fires on -c and heredoc shapes, stays silent on read-only and clean commands. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01KCGhDYoQBXs3poaR7sFuqp
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Why
#1083 prohibited the destructive-prepend one-liner, but landed the law as another block in the already-oversized
CLAUDE.md— exactly the drowning pattern the Goldstandard (v3) names. This PR re-lands it at standard.What (Goldstandard rules applied, by number)
.claude/knowledge/never-truncate-a-file-you-still-need-to-read.md— title IS the rule,READ BY:header,Status: CONTRACT (locked by operator directive, 2026-08-30)82679c3a, blobcdf8c15a^1)observed; falsifier's ceiling stated (wc -lcatches truncation, NOT same-length corruption)wc -lpost-check — an append-only file that got SHORTER is always a defecthooks/anti-pattern-matching.shextended: non-blocking PreToolUse guard fires when a Bash command combines open-for-write with.read()in one expression; header cites its founding incidentpython3 -c "open(p, \"w\")…") — fixed; final form fires on-cand heredoc shapes, stays silent on read-only and clean commands (can-it-fire + can-it-stay-silent pair)CLAUDE.md's 19-line block trimmed to a 9-line pointer at the lawPost-check