Add support for speaker diarization in azure-transcribe

[pragmatrix]

No description provided.

[Copilot]

Pull request overview

Adds optional speaker attribution to text outputs so Azure Transcribe can emit speaker diarization results end-to-end (service → core output → server protocol → examples), while keeping the field absent for services that don’t provide diarization.

Changes:

• Extend Output::Text / ConversationOutput::text() and ServerEvent::Text with an optional speaker field.
• Add a diarization parameter to Azure Transcribe and plumb Azure’s speaker id into final text events.
• Update downstream services/examples/recipes to the new output.text(..., speaker) signature and demonstrate the new flag.

Reviewed changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/protocol.rs	Adds optional speaker field to ServerEvent::Text payload.
src/context_switch.rs	Propagates speaker from core Output::Text into ServerEvent::Text.
core/src/conversation.rs	Extends Output::Text and ConversationOutput::text() to carry optional speaker.
services/azure/src/transcribe.rs	Adds diarization param; enables speaker recognition; emits speaker id on final results.
services/azure/src/translate.rs	Updates output.text() calls for new signature (also touches modality gating logic).
services/elevenlabs/src/transcribe.rs	Updates output.text() calls for new signature.
services/openai-dialog/src/lib.rs	Updates output.text() call for new signature.
services/aristech/src/transcribe.rs	Updates output.text() call for new signature.
examples/azure-translate.rs	Displays the new speaker field when printing text outputs.
examples/azure-transcribe.rs	Adds --diarization CLI flag and passes it into Azure Transcribe params.
justfile	Adds azure-transcribe-diarization recipe to run the example with diarization enabled.

[Copilot]

Pull request overview

Copilot reviewed 14 out of 14 changed files in this pull request and generated no new comments.