Feature: Add audio playback service (stream WAV to robot speaker) #34
Description
Summary
Support sending audio clips to Vector via HA service.
Why this matters
Advanced capability; lower priority than core settings/actions.
SDK evidence (no wire-pod dependency)
- Bidirectional stream RPC:
ExternalAudioStreamPlayback - Messages:
ExternalAudioStreamPrepare,ExternalAudioStreamChunk,ExternalAudioStreamComplete
Proposed HA design
- Service:
vector.play_audio - Input: media source with explicit format constraints
Acceptance criteria
- Supported formats/sample rates documented.
- Streaming includes strict timeouts and robust errors.
- Tests for validation and transport failure paths.