a-review (gemini, full migration diff) flagged that the smoke test had
the embedding model name baked into the SQL count query, decoupling it
from the application's configured value. Read it back from
`config.embeddings.model` (env override still wins) so the test stays
valid if the default ever moves off nomic-embed-text.
The runtime role (lovebug) doesn't have CREATE on the petalbrain database
even though it owns the second_brain schema, so a bare
`CREATE SCHEMA IF NOT EXISTS` errors out with permission denied. Gate
the bootstrap on a pg_namespace lookup so we only attempt the create
when the schema is genuinely missing — operators bootstrap it once as
postgres superuser, alembic just respects it afterward.
The smoke test exercises the full Postgres + embedding path against a
live DB + Ollama (autoskipped otherwise): writes an extraction, embeds
the summary, asserts public.embeddings has the expected row count, and
re-embeds to verify the delete-before-insert idempotency.
