## 1. Specification
- [x] 1.1 Define Azure Speech post-stream refinement configuration behavior.

## 2. Implementation
- [x] 2.1 Add configurable Azure Speech post-processing option.
- [x] 2.2 Apply the configured option only to compatible Azure Speech SDK recognizer paths and skip it for live `ConversationTranscriber`.
- [x] 2.3 Configure Azure Speech for a post-stream-refinement-supported region.
- [x] 2.4 Provision or reuse an Azure Speech resource and set the local key environment variable.

## 3. Validation
- [x] 3.1 Add provider tests for the post-processing option.
- [x] 3.2 Run focused provider tests.
- [x] 3.3 Run full test suite.
- [x] 3.4 Run OpenSpec validation.