# TASK-089-06-02: Tests and Docs Contract Tests, Schemas, and Documentation

**Parent:** [TASK-089-06](./TASK-089-06_Contract_Tests_Schemas_and_Documentation.md)  
**Status:** ✅ Done  
**Priority:** 🟡 Medium  
**Depends On:** [TASK-089-06-01](./TASK-089-06-01_Core_Contract_Tests_Schemas_Documentation.md)

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## Objective

Add tests and documentation updates for **Contract Tests, Schemas, and Documentation**.

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## Repository Touchpoints

- `tests/unit/`
- `_docs/`

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## Planned Work

### Regression Scenarios (Required)

1. schema-conformant happy path: responses validate against declared structured contracts.
2. legacy renderer path: legacy text mode remains available where required.
3. structured renderer path: structured or structured+summary outputs remain deterministic.
4. invalid payload path: schema violations fail fast with explicit contract errors.

### Metrics To Capture

- schema validation pass rate in contract tests
- structured vs legacy parity checks for key fields
- number of contract-breaking diffs detected by snapshots

### Documentation Deliverables

- update task-linked docs with a before/after summary tied to the captured metrics
- document exact test commands, fixtures, and profile/config used during validation
- record compatibility or migration notes when behavior differs between surfaces

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## Acceptance Criteria

- all required regression scenarios are implemented and passing in CI/local test runs
- metrics are captured with baseline vs post-change values and attached to the task update
- docs include the regression matrix and explain expected behavior boundaries
- no untracked regressions are observed on related router/dispatcher/platform paths

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## Atomic Work Items

1. Implement the required regression scenarios in focused unit/integration tests.
2. Run the target suites, collect metric outputs, and compare to baseline values.
3. Update docs with regression matrix, metric table, and migration/compatibility notes.
4. Verify adjacent surfaces for spillover regressions and document the result.
