ruamel.yaml is needed by tools/command_builder/yaml_writer to round-trip
commands.yaml without losing comments. pyautogui drives the new keys
action. pywebview is added now too so M2's GUI bootstrap can land
without another deps bump.
Replace the fixed 10s post-wake-word listen window with a VAD-driven
loop. Once at least 500ms of speech have been seen, 1.2s of silence
closes the window. Hard cap at 15s as a safety net.
Tunable in config.py via VAD_AGGRESSIVENESS, COMMAND_END_SILENCE_MS,
COMMAND_MIN_SPEECH_MS, COMMAND_MIN_LISTEN_MS, COMMAND_MAX_LISTEN_MS.
wake-word is now handled by vosk, so the picovoice access key is no longer
needed. config.py already had PICOVOICE_TOKEN removed in the previous commit.
