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Garry Tan
7fdd5a377d
Adversarial review (Claude subagent) found a CRITICAL the specialist pass missed: - F1 (CRITICAL): 'Human:'/'Assistant:' turn-prefixes bypassed BOTH the write-time denylist AND datamark(), landing verbatim in agent context inside the trusted ACTIVE DECISIONS fence. Add 'human:' (+ 'disregard previous', 'from now on') to the shared denylist, and have datamark() neutralize Human:/Assistant:/System:/User: turn-prefixes (ZWSP) at the render boundary. - F2: datamark() only stripped ASCII C0; extend to Unicode line terminators (U+0085/2028/2029) and U+007F so 'strip newlines' actually holds. - F3: validateDecide blocked only HIGH secrets; MEDIUM-tier PII (e.g. SSN) persisted silently and synced cross-machine. The store is non-interactive (no confirm path), so fail closed on MEDIUM too. - F4: compact() was a lock-free read-modify-rewrite that could clobber a concurrent append (lost decision). Add an O_EXCL compact lock + a pre-rename size recheck that aborts untouched (skipped=true) if an append landed; caller re-runs. - F7: filterByScope unknown/garbage scope fell through to 'return true' (leaked into every context); fail conservative (false). F5 (pid reuse) and F6 (pgrep over-match) are intentionally left as-is: both fail SAFE (over-refuse sync); making them precise would introduce a fail-DANGEROUS path (allowing sync during a real autopilot). True disambiguation needs gbrain to stamp the lock with a start-time, which gstack doesn't own. F8 (compact moves history to archive) is by design. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>