Start Core Hub FastAPI replacement foundation

docs/specs/README.md

@@ -7,6 +7,8 @@ This directory is the specification map for Core Hub. The specs are intentionall
 - [Architecture](core-hub-architecture.md) - component model and boundaries
 - [Contract and IR](contract-ir.md) - canonical framework contract, schemas, fixtures, and adapter rules
 - [API v2 Compatibility](api-v2-compatibility.md) - Inter-Hub compatibility surface to preserve during transition
+- [Inter-Hub Legacy Inventory](interhub-legacy-inventory.md) - initial route/data/consumer inventory for migration
+- [Contract Governance](contract-governance.md) - how contract changes are reviewed and recorded
 - [Data Model](data-model.md) - initial entity model and migration posture
 - [Event and Registry Model](event-and-registry-model.md) - event catalogs, manifests, widgets, and capability registries
 - [Auth, Access, and Custody](auth-access-and-custody.md) - API auth semantics and secret routing rules
@@ -14,6 +16,15 @@ This directory is the specification map for Core Hub. The specs are intentionall
 - [UI and Operator Console](ui-operator-console.md) - whynot-design aligned UI direction
 - [Testing, Release, and Migration](testing-release-and-migration.md) - verification, deployment, and cutover gates
 
+## Contract Artifacts
+
+Implementation-neutral artifacts live in `contracts/`:
+
+- `contracts/schemas/`
+- `contracts/catalogs/`
+- `contracts/fixtures/`
+- `contracts/openapi/`
+
 ## Contract Rule
 
 The implementation may change. The contract changes only through a workplan and a compatibility note.