feat(260521-fci-02): wire tickets-reconcile schedule + migration 090

- sync-scheduler.ts: extend sync_type union with 'tickets-reconcile', add a
  default schedule entry (disabled, 30 4 * * *), and a dispatch case using
  the device-link-reconcile / integration-health dynamic-import pattern.
- migrations/090_ticket_reconcile_schedule.sql: idempotent INSERT (ON CONFLICT
  DO NOTHING) so existing installs pick up the row without disturbing the
  fresh-DB default-seed path.

migrations/090_ticket_reconcile_schedule.sql

@@ -0,0 +1,24 @@
+-- Migration 090: Seed the tickets-reconcile sync schedule (STOPGAP).
+--
+-- The sync_scheduler.createDefaultSchedules() path only seeds defaults on a
+-- virgin sync_schedules table; this migration covers existing installs.
+-- Idempotent via ON CONFLICT (id) DO NOTHING.
+
+INSERT INTO sync_schedules (
+  id,
+  name,
+  description,
+  cron_expression,
+  sync_type,
+  years_back,
+  is_enabled
+) VALUES (
+  'tickets-reconcile',
+  'Tickets Reconciliation',
+  'STOPGAP backstop: re-fetches stale-open tickets (>7d since last sync) from Autotask and reconciles status / soft-deletes missing rows. Runs daily at 4:30 AM. Capped at 500 tickets per run.',
+  '30 4 * * *',
+  'tickets-reconcile',
+  NULL,
+  false
+)
+ON CONFLICT (id) DO NOTHING;