# TASK-083-03-02: Tests and Docs Server Factory and Composition Root

**Parent:** [TASK-083-03](./TASK-083-03_Server_Factory_and_Composition_Root.md)  
**Status:** ✅ Done  
**Priority:** 🔴 High  
**Depends On:** [TASK-083-03-01](./TASK-083-03-01_Core_Factory_Composition_Root.md)

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## Objective

Add tests and documentation updates for **Server Factory and Composition Root**.

## Current State

Factory/bootstrap regression tests exist and pass for default and alternate profiles, invalid profile failure, and no-side-effect startup.

This slice is now closed. Factory/bootstrap regression scenarios, docs coverage, and no-shim validation are all present.

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## Repository Touchpoints

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

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## Planned Work

### Regression Scenarios (Required)

1. factory bootstrap happy path: server boots from composition root with selected profile.
2. profile switch path: at least two profiles produce expected provider/transform stacks.
3. legacy compatibility path: startup remains stable without global side-effect imports.
4. failure path: invalid profile/config fails with deterministic bootstrap error.

### Metrics To Capture

- bootstrap success rate per profile
- profile boot latency before/after factory migration
- count of startup paths depending on side-effect registration (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.
