Add pending forced action and game_over fields to GameJoinResult:
- pending_forced_action: Included when player must complete a forced
action (e.g., select new active after KO). Essential for reconnection
so client knows what action is required.
- game_over: Boolean indicating if game has already ended.
- is_your_turn: Now True when player has pending forced action, even if
it's technically opponent's turn.
The join_game method now handles both initial joins and reconnections
(resume). The last_event_id parameter is accepted for future event
replay support.
Tests: 4 new tests for forced action handling and game_over flag.
Total 51 tests for GameService.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>