Non-blocking follow-ups from the merge-ready review:
- semantic.py: bound the doc_types copied into embeddings_queries metadata
to _USAGE_METADATA_MAX_DOC_TYPES (16). doc_types is caller-supplied with
no max_length on the tool signature; capping the stored copy keeps one
JSONB row from ballooning (not a billing/injection risk — CP ignores
metadata, binds are parameterized).
- migration: note that `metric` is intentionally unconstrained Text and
that adding a third metric requires keeping the CP-side catalog in sync,
else the rollup silently ignores the new rows.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
