Fix redundant Voice Live response cancellation on speech start

[Yulin Li (yulin-li)]

Purpose

Voice Live already interrupts the active response when it detects user speech. The Python, JavaScript, Java, and .NET Agent V2 quickstarts redundantly cancel that response again when handling input_audio_buffer.speech_started.

Remove the four automatic cancellation calls, their response-state flags, and cancellation-specific error suppression. Keep immediate local playback clearing, proactive greetings, audio processing, session configuration, and authentication unchanged. There are no manual response-cancellation calls or explicitly disabled automatic-interruption cases in these samples.

Does this introduce a breaking change?

[ ] Yes
[x] No

Pull Request Type

What kind of change does this Pull Request introduce?

[x] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Documentation content changes
[ ] Other... Please describe:

How to Test

• Get the code

git clone --branch fix/voicelive-service-interruption https://github.com/yulin-li/cognitive-services-quickstart-code.git
cd cognitive-services-quickstart-code

• Test the code

python3 -m py_compile python/Speech/voice-live-with-agent-v2.py
node --check javascript/speech/voice-live-with-agent-v2.js
dotnet build dotnet/Speech/VoiceLiveWithAgent.csproj
mvn -q -f java/Speech/pom-agent.xml dependency:build-classpath -Dmdep.outputFile=/tmp/voicelive-classpath.txt
mkdir -p /tmp/voicelive-classes
javac -encoding UTF-8 --release 11 -cp "$(cat /tmp/voicelive-classpath.txt)" -d /tmp/voicelive-classes java/Speech/VoiceLiveWithAgentV2.java

Python syntax parsing, JavaScript syntax checking, the .NET build, and direct Java compilation passed. Isolated before/after Python and JavaScript event checks reproduced the redundant cancels on the base revision and confirmed none are sent after this change, while playback clearing, subsequent audio, proactive greetings, and error reporting remain functional.

What to Check

Verify that the following are valid

• Speaking over a response still clears local playback immediately, without sending a second service cancellation.
• Later response audio still plays, and service errors are surfaced instead of special-casing cancellation errors.
• The change covers all four Voice Live runtime clients in this repository; agent-creation helpers and code-in-documentation were also audited for copies and interruption overrides.

Other Information

No live microphone/service session was run. No SDK APIs, dependencies, authentication, unrelated services, or agent-creation configuration were changed.