update tasklist: phase E complete

TASKLIST.md

@@ -6,13 +6,6 @@
 
 ## Pending
 
-### Phase E -- Polish
-
-- [ ] Deduplicate `_detect_config_changes` with `dataclasses.asdict()`
-- [ ] Suppress PTT chatlog spam for hold-mode
-- [ ] Add `-> None` return annotations throughout
-- [ ] Cache `users`/`channels` in `MumbleClient` with dirty flag
-
 ### Backlog
 
 - [ ] Audio device hot-swap
@@ -20,6 +13,13 @@
 
 ## Completed
 
+### Phase E -- Polish
+
+- [x] Deduplicate `_detect_config_changes` with `dataclasses.asdict()`
+- [x] Suppress PTT chatlog spam for hold-mode
+- [x] Add `-> None` return annotations throughout
+- [x] Cache `users`/`channels` in `MumbleClient` with dirty flag
+
 ### Phase D -- Test Coverage
 
 - [x] Add `ReconnectManager` unit tests (8 tests)