Adds two new test cases to test_play_locking.py to improve coverage:
1. test_lock_released_after_successful_completion
- Verifies play.locked is set to False after complete_play()
- Confirms play.complete is set to True
- Validates database commit is called
2. test_different_commands_racing_on_locked_play
- Tests that ANY command type is blocked on locked plays
- Prevents race conditions between different command types
- Tests multiple commands: walk, strikeout, single, xcheck
These tests ensure the play locking idempotency guard works correctly
for both lock acquisition and release, and prevents all command types
from racing (not just duplicate commands).
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
