feat: scaffold tuimble TUI mumble client

Core modules: TUI app (textual), mumble protocol client, audio pipeline (sounddevice + opus), push-to-talk with kitty protocol / evdev / toggle backends. Config via TOML.
2026-02-24 11:44:06 +01:00
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+# TODO
+
+- Investigate pymumble_py3 vs pymumble fork status
+- Check Textual key release event API surface
+- Test opuslib availability on Debian 12
+- Determine if sounddevice needs ALSA or PulseAudio config
+- Consider TOML config validation (pydantic?)