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observer-regression: a CI gate over dataset runs - #54
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Records a run from a results file (case -> trace) or gates a stored one, compares it with a baseline run and exits 0 (passes), 1 (regression or threshold failure) or 2 (could not decide). Unknown cases are reported apart and a run where nothing could be verified fails unless --allow-unverified, so the gate never goes green on no evidence. Roadmap step 4 marked done.
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Step 4 of docs/roadmap.md.
observer-regression(app/ops/regression_gate.py, entry point inbackend/pyproject.toml). Observer still does not execute the agent: CI passes the traces its cases produced (--results, case identified by its source trace or item id) or gates a stored run (--candidate latest).observer.regression.v1report), 2 could not decide (unreachable, unknown dataset/run, bad args).--max-regressions(default 0) block; without one, any failed case blocks (--max-failures). Optional--min-pass-rate,--max-health-drop,--fail-on-unknown.--allow-unverified: a gate must not go green on no evidence.previous, re-gate latest), error paths, exit code 2. Backend 194 passed, ruff clean. No dashboard or migration changes.Limitation (roadmap): tool/text expectations come back unknown on real traces until Manitos exports tool spans and reply text, so today the gate effectively enforces health conditions.