docs: backfill 05bab55 journal entry; real cause in MIGRATION browser note

The migration session crashed before journaling. Follow-up diagnosis:
extensions vanished because programs.chromium.extensions wasn't carried
into the downstream flake — Chromium external-uninstall deletes the
extensions AND their Local Extension Settings. Rewrite the browser
migration note with the mechanism and the snapshot recovery path.

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

agent/JOURNAL.md

@@ -19,6 +19,24 @@ Template:
 
 ---
 
+## 2026-07-11 — post-migration fix batch (05bab55; entry backfilled)
+- **Task:** Escalation — first real-hardware migration (TuringMachine →
+  Nomarchy) surfaced a batch of annoyances; session crashed before
+  journaling, entry written by the follow-up session.
+- **Did:** Force fprintAuth off unless `fingerprint.pam`; first-boot toast
+  waits for swaync + retries; night-light handles masked units; VPN menu
+  `rofi_menu` no-op fixed; ← = Back in list menus; GTK menu contrast;
+  mic-mute LED udev rule + sync; EasyEffects after tray; MIGRATION.md notes.
+- **Verified:** V0 flake check; checks.first-boot; checks.hardware-toggles.
+- **Pending:** V3 on the migrated machine. Follow-up found the downstream
+  `~/.nomarchy` lock still pinned the *previous* commit — the user's rebuild
+  excluded this batch (mic LED "regression" was just that). Also: HM
+  `programs.chromium.extensions` from the old config wasn't carried over, so
+  Chromium externally-uninstalled all extensions **and their data** (wallets
+  included); recovered from the `pre-nomarchy-home` btrfs snapshot.
+  MIGRATION.md browser note rewritten with the real mechanism.
+- **Next suggestion:** V3 sweep of the 05bab55 items after a locked rebuild.
+
 ## 2026-07-11 — #88 neon-glass polish / finish
 - **Task:** NEXT #88 — finish neon-glass (`VISION § D`), not quarantine.
 - **Did:** Rewrote `themes/neon-glass/rofi.rasi` (was invalid `var()` CSS;