Add Live Call transport layer (P10 foundation)
LiveProtocol — type-safe Kaizen WS protocol serialization/parsing,
mirrors lib/live/protocol.ts 1:1 (setup/resume/audio/text/interrupt/end
+ all 12 server event types).
LiveClient — OkHttp WebSocket client with auto-reconnect (exponential
backoff, max 5 attempts), resume protocol (sessionId + lastSeqId),
backpressure handling, terminal error detection. 15s ping interval
keeps mobile NAT alive.
AudioPipeline — bidirectional audio: AudioRecord (16kHz PCM16 mono,
VOICE_COMMUNICATION for hardware AEC/noise suppression) → 100ms chunks
→ Base64. AudioTrack (24kHz PCM16 mono, LOW_LATENCY, MODE_STREAM) ←
server chunks. Mic-ducking during KI speech (RMS threshold gating).
LiveCallService — Foreground Service (MICROPHONE type), survives
rotation/backgrounding. Notification with duration timer + end button.
Status state machine (IDLE→CONNECTING→LISTENING→SPEAKING). Orchestrates
LiveClient + AudioPipeline, emits onTurnEnd for tree integration.
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