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SG #40 was characterised across all D3 docs as warn-only / does not block. Verified end-to-end: security_reminder_hook.py does sys.exit(2) — a BLOCKING PreToolUse hook (one-time speed-bump per file+rule per session, the retry passes). SG2: on this Windows host the bundled hooks.json hardcodes python3, absent from PATH — the hook never spawned (inert). Fixed with a python3.exe shim in the Python install dir (env-only, not in repo). Normative sync: Tooling v2.5, PSR_v1 v3.5, Pravila v1.19, CLAUDE.md v2.5; ADR-003 amended; automation-graph sec_guidance nd(). Tool counts unchanged (40 positions). Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>