Move Soniqo live streaming into owhisper client

[ComputelessComputer]

Route local Soniqo Parakeet live audio through an owhisper-client local live client and reuse the shared listener stream finalization path.

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Note

Medium Risk
Touches the realtime transcription pipeline (buffering, finalize, dual-mic echo gate) with a large logic move; regressions could affect live session timing or transcript metadata even though behavior is intended to match via shared process_stream.

Overview
Moves local Soniqo Parakeet live transcription out of listener-core and into owhisper-client behind the local feature, so Soniqo follows the same live-client pattern as remote STT adapters.

listener-core now enables owhisper-client with features = ["local"] and spawn_soniqo_rx_task wires mic/speaker audio through LocalSoniqoLiveClient (from_realtime_audio_single / dual) and the existing process_stream + FinalizeHandle path, replacing hundreds of lines of inline buffering, flush timers, session lifecycle, and echo gating in adapters.rs.

The new local_soniqo_live module owns session start/stop on a blocking pool, 250ms buffer flushes, i16→f32 conversion, dual-channel echo suppression, and streams Result<StreamResponse, LocalSoniqoLiveError>; echo-gate unit tests moved with it. Cargo.lock picks up the transcribe-soniqo dependency on the consumer that enables local.

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There are 3 total unresolved issues (including 2 from previous reviews).

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