feat(auth): add request-scoped error action handling in conductor

- Add request-scoped error rule extraction from auth metadata or runtime provider config (including OpenAI compatibility fallback)
- Match rules by HTTP/status-code plus error body substring or regex patterns
- Support `stop`, `stop-and-cooldown`, `continue`, `continue-and-cooldown` actions with normalized validation
- Apply matched actions to execution results via request-scoped vs force-cooldown error codes and stop/continue flow control
- Introduce request-stop error wrappers/helpers for matching and unwrapping scoped stop state

Closes: #5006