islandflow/docs/implementation/smart-money/04-replay-evaluation-golden-tests.md

Smart-Flow Phase 04: Replay Evaluation and Golden Tests

Purpose

Make deterministic replay and golden output comparison the acceptance gate for smart-flow behavior changes.

Why this phase comes now

Replay evaluation should come after synthetic replay can select stable runs and after hypothesis scoring has outputs worth validating. This phase turns architecture discipline into a repeatable test path.

Dependencies on earlier phases

• islandflow-zxh.1 - Smart-flow contracts and vocabulary
• islandflow-zxh.2 - Evidence clustering and features
• islandflow-zxh.3 - Hypothesis scoring and abstention
• islandflow-259.4 - Synthetic replay integration

Likely files/modules touched

• services/replay/src/
• services/compute/tests/
• Synthetic fixture and manifest comparison helpers
• Golden fixture directories
• Optional service-container integration config if added later

In-scope work

• Recompute derived evidence/hypothesis outputs from raw synthetic streams.
• Compare stable output signatures with expected manifests.
• Include positive, abstention, false-positive, and noisy scenarios.
• Make replay/golden tests deterministic and infra-free by default.
• Gate optional ClickHouse/NATS/Redis tests outside the default path.

Explicitly out-of-scope work

• New scoring policy beyond fixes needed for deterministic evaluation.
• UI explainability.
• Historical calibration.
• Large generated fixture dumps.
• Making Docker-backed tests mandatory.

Acceptance criteria

• Replay recomputes derived smart-flow outputs from raw fixtures.
• Golden signatures cover positive, abstain, false-positive, and noisy scenarios.
• Default tests are deterministic and infra-free.
• Optional service-backed tests are clearly gated.
• Failures show concise, reviewable diffs or signature mismatches.

Test strategy

Use fixture-backed replay and compact golden signatures first. Add a small number of representative scenarios rather than broad generated dumps. If service-backed tests are added, mark them optional and document their dependencies.

Risks / design traps

• Golden files that are too large will become rubber-stamped.
• Full payload comparisons may break on harmless metadata changes.
• Optional infra tests can accidentally become required in CI.
• Replay that starts from derived events instead of raw fixtures will miss pipeline regressions.

Suggested future Codex implementation prompt

Implement docs/implementation/smart-money/04-replay-evaluation-golden-tests.md for Beads issue islandflow-zxh.4. Build deterministic replay/golden validation from raw synthetic fixtures. Keep default tests infra-free, compare stable signatures, and do not add UI explainability or historical calibration.

Matching Beads issue title/id

• islandflow-zxh.4 - Smart-flow phase 04: replay evaluation and golden tests