docs: capture today's Pres Mgmt config sync lessons for future agents

- BOOTSTRAP__AI_Agent_Quickstart.md: new category 9 under Common Mistakes
  pointing to today's incident (local/remote config sync pitfalls)
- REFERENCE__Common_Agent_Mistakes.md: three new entries —
  16) local "shadow field" silently bypasses an admin-synced master field
  17) SWR await after a write does not mean dependent caches are fresh
  18) conditional/stateful sync gates are effectively undebuggable
- PROJECT__Stores_Svelte5_Migration.md: updated the canonical Migration
  Pattern example to stamp __version in the serializer (the old example
  silently didn't, which is exactly what caused the leads_loc/pres_mgmt_loc
  bugs fixed today); flagged badges_loc/launcher_loc/events_auth_loc as
  not yet fixed (dormant, not harmful) and idaa_loc as the next migration
  that should get this from day one
- TODO__Agents.md: cross-referenced today's Pres Mgmt config sync overhaul
  in the LCI October restoration section for context, without touching
  the open items in that list

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

documentation/BOOTSTRAP__AI_Agent_Quickstart.md

@@ -300,6 +300,10 @@ Read this section first, then open the reference doc when your task touches one
 6. **Network reliability** — retry classification in `api_*_object.ts` and timeout behavior.
 7. **JSON field safety** — `*_json` null reads/writes and wrapper serialization behavior.
 8. **Service worker rollout behavior** — stale-tab symptoms, activation expectations, and trade-offs.
+9. **Local/remote config sync** — shadow fields that silently bypass an admin-synced master
+   field, SWR-await-after-write races, and stateful/conditional sync gates that desync local
+   state from history rather than current config. See the Pres Mgmt Config sync overhaul
+   (2026-06-16) in `PROJECT__AE_Events_PressMgmt_Config_Cleanup.md` for the full incident.
 
 The reference doc also includes a short archive list for older, less-relevant historical incidents.