Finding: L2 huddle device enumeration used a sync command on provider mount/devicechange, and start/join performed sequential membership fetches plus synchronous STT/TTS ONNX construction on async workers.
Make audio output enumeration an async command backed by spawn_blocking, fetch bot/all memberships in parallel during post-connect setup, and construct STT/TTS pipelines on the blocking pool while preserving starting sentinels, stale-session checks, and final phase checks.
Co-authored-by: Tyler Longwell <tlongwell@block.xyz>
Signed-off-by: Tyler Longwell <tlongwell@block.xyz>
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