Surface: real T3 web development server on Linux, isolated fresh database; browser-authenticated HTTP request. Commit: ce6cc8b5404cc548169e08b1dc4654c69e6dfef1 POST /api/voice/post-process Transcript: hello world Draft: empty, selection 0..0 Cleanup provider: OpenCode, same available configured model as base (identifier withheld) Default instructions: HTTP 200 {"text":"Hello, world."} Custom instructions: Fix capitalization and punctuation. Return only the cleaned transcript. Do not output JSON. Custom result: HTTP 200 {"text":"Hello, world."} Microphone and composer insertion were not exercised.