Defer team balance during rounds

[themuffinator]

Summary

• add a queue for requested balance team changes and track pending requests during round-based play
• defer TeamBalance changes during active rounds and apply them once the round has ended
• expose balance queue processing and run it when a round concludes

Testing

• not run (not requested)

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Codex Task

[chatgpt-codex-connector]

💡 Codex Review

https://github.com/themuffinator/muffmode/blob/8d69ec5fca0b5cb1958fccbcdbc6df4e4044b8d0/src/g_cmds.cpp#L1965-L1969
Ignore disconnected clients when simulating queued balances

TeamBalance adjusts red_count/blue_count using every queued request even if that client has already disconnected. If a player queued to swap teams leaves mid‑round, their stale entry still cancels out the perceived imbalance, so auto‑balance stops enqueuing replacements while the real teams remain uneven; ProcessBalanceQueue later skips the disconnected slot and nothing changes, leaving the next round imbalanced.

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