Auto-resume: save playback position on stream errors and cancellation,
restore automatically after reconnect or container restart once the
channel is silent. Plugin lifecycle hook (on_connected) ensures the
reconnect watcher starts without waiting for user commands.
Sorcerer tier: new permission level between oper and admin. Configured
via [mumble] sorcerers list in derp.toml.
Mumble cert auth: pass certfile/keyfile to pymumble for client
certificate authentication.
Fixes: stream_audio now re-raises CancelledError and Exception so
_play_loop detects failures correctly. Subprocess cleanup uses 3s
timeout. Graceful shutdown cancels background tasks before stopping
pymumble. Safe getattr for _opers in core plugin.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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