# v1.51 Milestone Audit

Status: passed

## Scope Closed

- Phase `85`: schema mirror baseline
- Phase `86`: schema tree doc boundary
- Phase `87`: closure and regression audit

## Production Outcome

`v1.51` now exposes a reviewable schema-tree contract through:

- `research/knowledge-hub/schemas/promotion-or-reject.schema.json`
- `schemas/README.md`
- `research/knowledge-hub/schemas/README.md`
- `docs/architecture.md`
- `research/knowledge-hub/tests/test_schema_tree_contracts.py`

## Verification Evidence

- schema mirror slice:
  - `python -m pytest research/knowledge-hub/tests/test_schema_tree_contracts.py::SchemaTreeContractTests::test_promotion_or_reject_schema_is_valid_and_mirrored -q`
  - result: `1 passed`
- schema docs slice:
  - `python -m pytest research/knowledge-hub/tests/test_schema_tree_contracts.py::SchemaTreeContractTests::test_schema_tree_docs_explain_public_and_runtime_boundaries -q`
  - result: `1 passed`
- schema-tree contract slice:
  - `python -m pytest research/knowledge-hub/tests/test_schema_tree_contracts.py -q`
  - result: `2 passed`
- compatibility regression slice:
  - `python -m pytest research/knowledge-hub/tests/test_phase6_protocols.py research/knowledge-hub/tests/test_schema_contracts.py -q`
  - result: `15 passed`
- full knowledge-hub suite:
  - `python -m pytest research/knowledge-hub/tests -q`
  - result: `329 passed, 10 subtests passed`
