Adds the supporting infra around the service catalog now that it
has external consumers (the asset_engine UI being the first; CLIs,
monitoring, other services may follow):
- CATALOG-CONTRACT.md: the consumer-facing contract. Defines
versioning policy (catalog_version vs per-service version),
closed field-type and response-type vocabularies, recommended
vendor+drift-check sync workflow, known-consumers list, service
authoring notes.
- services.schema.json: JSON Schema (draft 2020-12) for the
catalog. Generated from the Pydantic model in
~/development/asset_engine/src/asset_engine/catalog.py via
`uv run scripts/dump_schema.py --publish`. Lets non-Python
consumers validate against the same shape.
- services.yaml: adds catalog_version: 1 at the root and reframes
the file's header to call out its first-class-contract status.
Quotes a vibevoice label that contained an unescaped colon
(caught by the asset_engine's strict YAML parser on first sync).
vh
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