[P2] Register capability-bundle schema and expand self-smoke validation

[stranske]

Why

In scripts/validate_run_contract.py lines 45-51, INGEST_SCHEMA_FILES maps satellite contract schemas for consumer verification, but omits the capability-bundle contract schema mapping despite docs/contracts/schemas/capability-bundle-v1.schema.json existing in the repository. Furthermore, _self_smoke in lines 488-495 validates only three schemas, omitting docs/contracts/schemas/capability-bundle-v1.schema.json and docs/contracts/schemas/tracked-variable-v1.schema.json from Draft202012 schema conformance checks.

Scope

• Add capability-bundle contract mapping to docs/contracts/schemas/capability-bundle-v1.schema.json in INGEST_SCHEMA_FILES in scripts/validate_run_contract.py.
• Update _self_smoke in scripts/validate_run_contract.py to validate all five schema files under docs/contracts/schemas.
• Add test coverage in tests/test_main.py.

Non-Goals

• Modifying schema definitions in docs/contracts/schemas.
• Changing run envelope required sections or unsafe raw payload checks.
• Scaffold-only completion does NOT count: adding the schema mapping without expanding _self_smoke coverage is a failure of this issue.

Tasks

• Map capability-bundle-v1.schema.json in INGEST_SCHEMA_FILES in scripts/validate_run_contract.py
• Update _self_smoke in scripts/validate_run_contract.py to check all JSON schema files in docs/contracts/schemas
• Add unit tests in tests/test_main.py exercising consumer schema validation

Acceptance Criteria

• python scripts/validate_run_contract.py --self-smoke --schema-dir docs/contracts/schemas --registry config/backplane_participants.json passes with all schemas checked.
• pytest tests/test_main.py passes with exit code 0.
• Deliberate-break demonstration: removing capability-bundle schema from INGEST_SCHEMA_FILES causes pytest tests/test_main.py to fail, and reverting restores pass.

Implementation Notes

References: Code/Audits/Ready/2026-09-07-00-repo-map.md.
Ensure all schemas remain valid Draft 2020-12 schemas.

[stranske]

D4-verify-merged-2026-09-13T01: merged PR lacks deliberate-break transcript for the named gate. Follow-up filed: #581