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/TODO__Agents.md

@@ -10,6 +10,16 @@
 These features regressed over the last 6 months and must be working before the LCI conference.
 Reference commit for original working implementation: `bb993a102`.
 
+**2026-06-16:** Pres Mgmt's config sync architecture was overhauled the same day this list's
+LCI event data was used for live testing — `lock_config` removed (was causing "sometimes
+works" reports tied to save history, not current settings), POC/Location list-table column
+bugs fixed (admin setting was being silently ignored), QR display fixed to match the intended
+global-default-with-trusted-override design, and the Config page got a documentation pass
+(title tooltips, POC settings split into its own section). None of this touches the open
+items below, but anyone picking those up should know the sync layer underneath them is in a
+meaningfully different (and better-understood) state now. Full incident log:
+`PROJECT__AE_Events_PressMgmt_Config_Cleanup.md`.
+
 ### Session POC (Champion/Moderator) — `session_view.svelte`
 
 **Root cause of visible bugs:** The POC section is placed *below* the session hero card as a