fix(launcher): address in-game helper review

- restore hidden windows even when the launcher output pipe is closed;
- exit the hide watcher after ten idle minutes and start it only after the
  installed-client check;
- reject missing, malformed or invalid close-during-game preferences instead
  of silently selecting hide;
- document the preference contract and idle behavior.

docs/SETUP.md

@@ -81,13 +81,14 @@ for the observed failures, recovery guards and NSURLSession limitations.
 `RCLOL_CLIENT_IN_GAME_TRICKS=1` opts in to automatic client handling during a
 match. It reads `lol-user-experience` from the installed client's
 `LCULocalPreferences.yaml`: with `potatoModeEnabled: true`, it closes the client
-UI when `closeLeagueClientDuringGame: true`, otherwise it hides the managed
-`LeagueClientUx`/`Riot Client` X11 windows and restores them when the game
-ends. With client optimizations disabled or preferences unreadable it does
-nothing. The low-level `RCLOL_CLOSE_CLIENT_IN_GAME=1` and
+UI when `closeLeagueClientDuringGame: true`, and hides the managed
+`LeagueClientUx`/`Riot Client` X11 windows when that value is false. Missing or
+invalid preference values, disabled client optimizations and unreadable files
+select no action. The low-level `RCLOL_CLOSE_CLIENT_IN_GAME=1` and
 `RCLOL_HIDE_CLIENT_IN_GAME=1` switches remain available when the automatic
 switch is not set. The feature is off by default, requires X11/Xwayland, and
-does not patch client binaries, CEF or the game. See
+does not patch client binaries, CEF or the game. The hide helper exits after ten
+minutes without a client or match once it has seen one. See
 [the troubleshooting measurement](TROUBLESHOOTING.md#automatic-client-handling-during-a-match)
 for the measured CPU effect and limitations.
 

docs/TROUBLESHOOTING.md

@@ -206,13 +206,16 @@ It reads `lol-user-experience` from the installed client's
 | Client preference | Launcher action |
 |---|---|
 | `potatoModeEnabled: false` or unreadable | no client-in-game helper |
+| `potatoModeEnabled: true`, close preference missing or invalid | no action |
 | `potatoModeEnabled: true`, `closeLeagueClientDuringGame: true` | close the client UI |
 | `potatoModeEnabled: true`, `closeLeagueClientDuringGame: false` | hide the client windows |
 
 The hide path unmaps the `LeagueClientUx` and `Riot Client` X11 windows and maps
 them again when the game process ends. The client is not closed, the League
 backend and Riot client keep running, and the game window is never hidden. The
-close path uses the UI-close helper described above.
+close path uses the UI-close helper described above. The hide helper exits after
+ten minutes without a client or match once it has seen one; a missing or invalid
+close preference selects no helper.
 
 The low-level `RCLOL_HIDE_CLIENT_IN_GAME=1` and
 `RCLOL_CLOSE_CLIENT_IN_GAME=1` switches remain available when the automatic