# TASK-092-04-02: Tests and Docs Router Integration, Masking, and Budget Control

**Parent:** [TASK-092-04](./TASK-092-04_Router_Integration_Masking_and_Budget_Control.md)  
**Status:** ✅ Done  
**Priority:** 🟡 Medium  
**Depends On:** [TASK-092-04-01](./TASK-092-04-01_Core_Router_Integration_Masking_Budget.md)

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## Objective

Add tests and documentation updates for **Router Integration, Masking, and Budget Control**.

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## Repository Touchpoints

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

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## Planned Work

### Regression Scenarios (Required)

1. sampling-available happy path: assistant returns typed validated result envelope.
2. sampling-unavailable path: deterministic fallback contract is returned.
3. budget/masking path: policy limits and masking rules are enforced.
4. boundary path: assistant output cannot bypass router safety or inspection truth checks.

### Metrics To Capture

- typed result validation success rate
- fallback activation rate when sampling is unavailable
- policy violation count for assistant boundary rules (target: 0)

### 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.
