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Per ADR-001 step 3 / AC-4: after the freshly rebuilt staging container is healthy, run staging_check.py --mode stub against the fresh 8501 stand BEFORE reporting success, so the EXACT artefact BUILD-ONCE retagged to prod is the one validated on staging. Fail-closed: staging_check rc!=0 -> exit 1 (not promoted). - Invoked inside the container (docker exec $TARGET_SERVICE) per the canonical signature in scripts/staging_check.py header, --base-url http://localhost:$TARGET_PORT. - Targets ONLY 8501 (staging), never 8500 (prod) - AC-9. - --mode stub: fast, deterministic, no LLM spend (ADR). - Static regression test test_tc07_build_staging_runs_staging_check_stub_after_health: asserts staging_check.py + --mode stub present, runs after health, before exit 0, fail-closed, and never hard-codes prod 8500.