feat(alerts): split interest.stale into worked-then-quiet + new-untouched (interest.no_activity)

- interest.stale now fires only for interests with real in-system follow-up
  (contact log / note / update audit) that went quiet 14+ days.
- new interest.no_activity rule covers never-touched, non-imported interests.
- guard interest.high_value_silent against imported-untouched hot leads.
- keys off migration_source_links ledger to identify the bulk import, so the
  imported backlog matches neither rule and the engine auto-resolves the flood.
- test teardown: delete interest_contact_log + test migration ledger rows.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

tests/global-setup.ts

@@ -47,6 +47,7 @@ export async function teardown() {
     , del_files AS (DELETE FROM files WHERE port_id IN (SELECT id FROM doomed) RETURNING 1)
     , del_ft AS (DELETE FROM form_templates WHERE port_id IN (SELECT id FROM doomed) RETURNING 1)
     , del_gr AS (DELETE FROM generated_reports WHERE port_id IN (SELECT id FROM doomed) RETURNING 1)
+    , del_icl AS (DELETE FROM interest_contact_log WHERE port_id IN (SELECT id FROM doomed) RETURNING 1)
     , del_int AS (DELETE FROM interests WHERE port_id IN (SELECT id FROM doomed) RETURNING 1)
     , del_ib AS (DELETE FROM interest_berths WHERE berth_id IN (SELECT id FROM berths WHERE port_id IN (SELECT id FROM doomed)) RETURNING 1)
     , del_inv AS (DELETE FROM invoices WHERE port_id IN (SELECT id FROM doomed) RETURNING 1)
@@ -69,5 +70,8 @@ export async function teardown() {
     , del_ports AS (DELETE FROM ports WHERE id IN (SELECT id FROM doomed) RETURNING 1)
     SELECT 1
   `);
+  // migration_source_links has no port_id FK; purge test-only ledger rows by
+  // the marker applied_id our alert tests use.
+  await db.execute(sql`DELETE FROM migration_source_links WHERE applied_id = 'test-apply'`);
   await closeDb();
 }