The insights table uses vector(1536) but no migration enables the pgvector
extension. CI postgres (pgvector/pgvector:pg17) has the extension available
but it must be explicitly created before use.
Adds CREATE EXTENSION IF NOT EXISTS vector at the top of
0001_cynical_ultimatum.sql (the first migration referencing vector type).
The migration file 0001_cynical_ultimatum.sql existed on disk but was not
registered in the Drizzle journal (_journal.json). This caused fresh-database
migrations (CI) to skip creating tables (agent_logs, insights, preferences,
skills, summarization_jobs), then 0002_nebulous_mimic.sql would fail trying
to ALTER the non-existent preferences table.
Fix: insert cynical_ultimatum at idx 1 in the journal and shift all
subsequent entries (idx 2-7).
Verified: pnpm test passes (347 tests, 35 tasks).
