Emit state, context and audio levels from the voice loop

speaking comes from the reply thread, not the speaker: the tool
announcement would otherwise replace the tool state while the tool is
still running. arecord gets a 33 ms period, because it writes its file
in periods and the default left the user's waves at 8 levels a second;
the context size is read at startup so the first hello carries it.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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