[WingedGuardian]

What changes

A completed user transcript now reaches the existing disconnect guard. OpenAI Realtime emits it upstream, where the user context aggregator consumes it before the downstream idle manager sees it. This made the guard refuse the model's disconnect tool even after real user input.

A small observer between the service and user aggregator records final user-turn evidence on the same idle manager. It forwards frames unchanged and works with or without the context aggregator. Empty/partial transcripts do not qualify, and the existing bot-response ordering and session-reset rules remain in force.

Adds a CI job that installs the S2S bridge's existing Poetry lock and runs its test suite.

Closes #49.

Validation

• Both real-pipeline regression cases failed before the fix because the guard stayed false after a completed user transcript.
• 96 S2S tests pass with locked bridge dependencies (Pipecat 1.12.0).
• The two regression cases also pass after strengthening them to call the actual application disconnect predicate. They cover blank input, a completed user turn and a later bot response, with and without the user aggregator.
• No provider connection is made: the test invokes the real service's transcript emission method on a fake service in the real pipeline.
• Ruff, CI YAML parsing, privacy scan and independent local architect/security reviews pass. GitHub CI/review follow publication.

This is PR 1 of a three-PR reliability stack; pipeline startup ownership (#50) and reconnect continuity (#51) follow separately.

E2E: after merge and an owner-approved deploy, start a voice conversation, say goodbye or stop listening, and verify disconnect_client is accepted after a real user turn; verify idle or echo-only input still cannot authorize a hangup.

[chatgpt-codex-connector]

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Review	Status	Commit	Review trigger
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[WingedGuardian]

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