Why: Review found stale-source, direct-command, native-tool, and clarification-watermark bypasses in the earlier Backend pin. Evidence: Backend 5ccbe8f passes the full Go test and build suites after closing those paths. Impact: The Dev combination records the fail-closed project work and W4b host contract for later exact-head replay. Refs: TT-N03 TT-R01 W4b
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