Grid/contacts unification step 1: real contact_id link + grid as front door (v0.1.0:52)

Structural fix for the duplicate-people class of bug: instead of matching a grid
contact "pill" to a contacts row heuristically by name/email (which drifted and
caused the 1406 double-count), link them by id.

Backend:
- Migration 0004: fundraising_contacts.contact_id (additive, nullable, logical FK
  to contacts(id)) + index. Paired down migration.
- sync_fundraising_relational now stores the id that _upsert_contact_from_fundraising
  already returns, so every grid contact carries its contacts-table id.
- _backfill_grid_contact_ids: one-time, idempotent backfill on startup (re-runs the
  grid sync once if any row lacks contact_id), so existing data links immediately.
- entity_resolution: grid pass prefers the explicit contact_id link (match_kind
  'grid_link') over heuristic email / name+investor, guarded by a PRAGMA check so
  older DBs without the column still work.

Frontend:
- Fundraising grid "+ Row" -> "+ Investor" (clear, single investor entry point).
- Contacts page: the "+ Add Contact" trigger is replaced by a pointer to the grid;
  the page is now a read/search/edit view (ContactDetailPanel still edits all
  fields). New people are added from the grid. No contact data is removed.

Tests: backend/ingest/test_entity_resolution.py extended (explicit-link case, 11/11)
and a new backend/test_grid_contact_link.py integration test (init_db applies 0004,
sync populates contact_id to the right contact, re-sync is idempotent). py_compile +
frontend html.parser clean.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

start9/0.4/startos/utils.ts

@@ -16,8 +16,9 @@ export const PACKAGE_TITLE = 'Ten31 Database'
 //   * 0.1.0:48 (entity model: investors vs people; fixes double-count)
 //   * 0.1.0:49 (Architect: Claude thesis generation + Thesis Workshop screen)
 //   * 0.1.0:50 (Set Anthropic API Key UI action — no terminal needed)
-//   * Current:        0.1.0:51 (entity-resolution fix: people double-count + duplicate queue)
-export const PACKAGE_VERSION = '0.1.0:51'
+//   * 0.1.0:51 (entity-resolution fix: people double-count + duplicate queue)
+//   * Current:        0.1.0:52 (grid/contacts unification: contact_id link + grid as front door)
+export const PACKAGE_VERSION = '0.1.0:52'
 
 export const DATA_MOUNT_PATH = '/data'
 export const WEB_PORT = 8080