speechRmsThreshold (audio/endpointer.ts)

Energy‑VAD endpointer that detects speech start, utterance, and misfire from 16kHz audio frames.

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/**
 * Energy-VAD endpointing state machine (THU-684) — the pure logic behind the mic
 * gate, split out of `vad.ts` so it's unit-testable without `getUserMedia` /
 * `AudioWorklet`. Feed it 16 kHz mono frames via `processFrame`; it fires
 * `onSpeechStart` once speech is sus

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