Detect authentication_failed errors from the Claude Code PTY stream
and automatically refresh the OAuth access token using the stored
refresh token in ~/.claude/.credentials.json.
- New module server/src/llm/oauth.rs: reads credentials, calls
platform.claude.com/v1/oauth/token with JSON body, writes back
- PTY provider detects "error":"authentication_failed" via AtomicBool
- chat_stream retries once after successful refresh
- Clear error message if refresh also fails
On success the retry is transparent. On failure the user sees:
"OAuth session expired. Please run claude login to re-authenticate."
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Timmy
710b604b7c