Add ability to specify which game to launch on Windows via --game CLI argument.
- Introduce FWS_DEFAULT_GAME environment variable (defaults to 'valorant')
- Parse --game option in to-windows command to override default
- Sanitize game identifiers using lowercase and allowed chars [a-z0-9_-]
- Write atomic game token (launch.json) to ESP FAT partition for Windows to consume
- Purge stale tokens on write failure to prevent replay of old choices
- Update help text with new option and game identifier constraints
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