fix: add BackfillMissingPlayerGames command

[wescopeland]

Resolves #5035.

php artisan ra:platform:game:backfill-missing-player-games 24005,25687,22939
php artisan ra:platform:game:update-player-games 28561
php artisan ra:platform:game:update-player-count 24708,28635,5932

Before

After

[greptile-apps]

Confidence Score: 5/5

Safe to merge — the command is additive, read-scoped to explicit game IDs, and the write path is already exercised by AttachPlayerGameAction.

Narrowly scoped command with required game ID input, correct deduplication via DISTINCT, and no changes to shared application logic. The write path delegates to an existing, tested action.

No files require special attention.

_{Reviews (3): Last reviewed commit: "Merge branch 'master' into add-backfill-..." | Re-trigger Greptile}