chore(m5): drop core connector engine + DB v5 migration

[graydawnc]

Summary

Continuation of #112 / #113 / #114. Removes the connector subsystem from @spool-lab/core — engine, scheduler, registry, plugin loader, capabilities, prerequisite checker, trust store, all capture queries — and adds a v5 schema migration that drops the connector tables on existing user DBs and narrows the stars CHECK constraint to session-only.

The renderer (#112), main process (#113), and CLI (#114) already stopped consuming any of this surface, so the cut is contained to packages/core/. Nothing else needed to change.

-6007 / +317 net.

Migration story

• Existing user upgrading from v4 → v5 migration drops captures / captures_fts / captures_fts_trigram / capture_connectors / connector_sync_state + their triggers, deletes capture stars, rebuilds stars with the narrowed CHECK, drops the 'connector' source row. Captures data is gone — by design (users were/will be directed to Spool Daemon for connector functionality).
• Fresh install on the post-v5 schema → schema block creates only the session tables; v1–v3 migrations no-op via try/catch (they reference tables that no longer exist on a fresh install); v4 creates stars; v5 narrows it via the rebuild round-trip.

Schema diff (packages/core/src/db/db.ts)

• Schema block: removed captures, captures_fts, captures_fts_trigram, capture_connectors, connector_sync_state tables and their indexes; narrowed stars CHECK to item_type = 'session'; dropped the 'connector' source row from the seed insert
• Trigger block: removed captures_fts_insert / captures_fts_delete triggers (kept their DROP IF EXISTS for upgrade cleanup)
• v1–v3 migrations: wrapped in try/catch (table references no longer present on fresh install)
• New v5 migration that does the actual table drops + stars rebuild
• Maintenance section: dropped the captures FTS rebuild and the capture-orphan-stars sweep

Other changes

• src/connectors/ — deleted entirely (27 files, ~3700 LOC)
• src/db/queries.ts — dropped searchCaptures, searchAll, searchCaptureRows, mapCaptureRows, mergeCaptureGroups, insertCapture, getCaptureCount, compareSearchResultRelevance, getMatchTypePriority; narrowed getStarredUuidsByType and listStarredItems to session-only
• src/types.ts — deleted CaptureResult, Capture, CapturedItem exports; narrowed SearchResult, StarKind, StarredItem
• src/index.ts — dropped all connector + connector-sdk re-exports
• package.json — dropped @spool-lab/connector-sdk, effect, semver, tar deps + their @types; removed connector-sdk filter from build script

New tests

• src/db/migration-v5.test.ts — seeds a hand-built v4 DB with a session, a capture, a capture star, a connector_sync_state row; runs getDB(); verifies tables dropped, capture stars gone, session star kept, capture inserts now rejected, 'connector' source row gone, user_version = 5. Plus a fresh-install no-op case.
• src/db/stars.test.ts — rewritten session-only (5 capture-specific cases removed, seedCapture helper gone)

Features that should still work post-PR (verified)

Feature	Verification
Core build	pnpm build clean (no connector-sdk filter; just tsc)
Core unit tests	48/48 pass (parsers, syncer, watcher, search-query, stars, migration-v5)
searchFragments shape	kind: 'fragment' round-trip via spool search
getStarredUuidsByType	new shape { session: string[] } typed end-to-end
listStarredItems	session-only union, app already filters at boundary
App typecheck	pnpm exec tsc --noEmit clean
App electron build	pnpm build:electron clean — main bundle 56.65 kB → 55.72 kB, loader chunk 308.57 kB → gone (replaced by syncer chunk at 68 kB)
CLI build + tests	pnpm build clean, 21/21 tests pass
spool sync	Indexes 5 Claude fixture sessions
spool status	Reports 5 total (claude: 5, codex: 0, gemini: 0)
spool search XYLOPHONE_CANARY_42	Returns matching session
Final DB schema	sqlite3 dump shows only session tables — no captures/connector_sync_state/etc. — user_version = 5
Migration on real v4 data	Seeded 2 stars (1 session + 1 capture), upgraded → capture star gone, session star kept, connector tables gone, narrow CHECK rejects new capture inserts

Test plan

• pnpm test (core) 48/48 pass including new migration-v5 test
• pnpm test (cli) 21/21 pass
• pnpm build:electron (app) clean
• spool sync / status / search smoke against real Claude fixtures
• Verified DB schema after migration — only session tables remain, user_version = 5
• Smoke session-search/agent-search/star/unstar in the running Electron app (will do once CI is green)
• Smoke upgrade path with a real previous-version DB (preserved for the prod-style install smoke test that's tracked separately for the v0.4.0 release)

🤖 Generated with Claude Code