[maciejkucmierz-swm]

Demonstrate upstream communication sessions, voice processing and queued Realtime playback with barge-in and lifecycle recovery in FabricExample.

Include a server-only token endpoint, focused regression tests and AEC documentation links.

Related: #1323, #1324, #1317.
Companion documentation: #1344.
No issue to close.

⚠️ Breaking changes ⚠️

• None. No public API or library implementation changes.

Introduced changes

• Add a Voice Chat demo showcasing RNAA communication sessions, voice processing and streamed playback with barge-in.
• Handle audio interruptions and session cleanup.
• Include a local OpenAI token server, setup instructions and AEC documentation links.
• Add focused tests for turn-taking, playback and lifecycle handling.

Validation:

• 25 focused app tests and 3 mocked token-server tests pass.
• TypeScript, lint, formatting, Android bundling and Android debug build pass.
• yarn validate:fast passes, including 549 C++ tests and 117 library JS tests.
• Physical Android and iPhone testing completed successfully.

Checklist

• Linked relevant issue — related PRs linked; no issue to close
• Updated relevant documentation
• Added/Conducted relevant tests
• Performed self-review of the code

[github-actions]

WPT non-regression comparison

PASS — no regressions · 0 improved section(s) · overall 3427 → 3427 (0)

Unchanged sections (28)

Spec section	Base pass	Head pass	Delta
Processing model	1	1	0
Other	56	56	0
AnalyserNode	138	138	0
AudioBuffer	140	140	0
AudioBufferSourceNode	220	220	0
AudioContext	58	58	0
AudioNode	261	261	0
AudioParam	680	680	0
BiquadFilterNode	275	275	0
ChannelMergerNode	30	30	0
ChannelSplitterNode	7	7	0
ConstantSourceNode	64	64	0
ConvolverNode	178	178	0
DelayNode	127	127	0
DestinationNode	0	0	0
DynamicsCompressorNode	4	4	0
GainNode	15	15	0
IIRFilterNode	87	87	0
MediaElementAudioSourceNode	0	0	0
MediaStreamAudioDestinationNode	1	1	0
MediaStreamAudioSourceNode	0	0	0
OfflineAudioContext	35	35	0
OscillatorNode	104	104	0
PannerNode	727	727	0
PeriodicWave	33	33	0
ScriptProcessorNode	0	0	0
StereoPannerNode	104	104	0
WaveShaperNode	82	82	0

_{Baseline: a07241cbc70ac16a4c107e1125d74fc8ca63eb0e · Candidate: fd9be3a7683c6d4e6245dd0d5ca611dc33971bb8}

_{Workflow run · this comment is updated on every push.}