meeting-assistant/openspec/changes/archive/2026-05-22-add-azure-speech-post-refinement/proposal.md

Why

Azure Speech post-stream refinement can improve final segment quality while preserving the existing low-latency streaming transcription flow.

What Changes

• Add an AzureSpeech.PostProcessingOption setting.
• Keep the default option unset while the live Azure backend uses ConversationTranscriber.
• Apply the configured option only for compatible Azure Speech SDK recognizer paths; skip it for ConversationTranscriber to preserve working live diarized transcription.
• Use a Speech resource region that supports post-stream refinement.

Impact

• Affected specs: meeting-transcription
• Affected code: Azure Speech options, Azure streaming transcription provider, appsettings, Azure provider tests