docs(todo): add launcher wallpaper drift hotplug follow-up

Track projector/display unplug-replug wallpaper reset behavior and evaluate loop/check/event-driven strategies.

documentation/TODO__Agents.md

@@ -74,6 +74,18 @@ guessing defaults.
   (`aether_app_native_electron`), append a timestamp or random suffix to the temp filename on
   every download so macOS always sees a new path (e.g. `wallpaper_1748123456.jpg` instead of
   `wallpaper.jpg`).
+- [ ] **[Launcher/Electron] Wallpaper drift after display hotplug (post-CMSC)** —
+  In live setups, wallpaper can randomly reset when projectors/displays are unplugged or
+  reattached. Add a resilient strategy that avoids unnecessary churn when wallpaper is already
+  correct.
+  **Options to evaluate:**
+  - periodic reconciliation loop with backoff/jitter and a cheap "is wallpaper already correct?"
+    check before applying
+  - event-driven reapply when display topology changes (new display detected), leveraging the
+    updated Electron display library
+  - hybrid: event-driven first, periodic safety check as fallback
+  **Goal:** keep podium/projector wallpaper stable without repeatedly setting wallpaper when no
+  change is needed.
 - [ ] **[Launcher/Electron] `run_cmd`/`run_cmd_sync` — phantom `return_stdout` param (low priority)** —
   `electron_relay.ts` passes `return_stdout` in the args object, but both IPC handlers ignore it
   (stdout is always returned). Effectively a no-op, but creates a misleading API contract. Fix: