A series of fixes for making GPT-5 reliable and effective with anyclaude.
## UX changes
- Converts opaque OpenAI service errors into 429s so CC natively retries instead of failing. These are very common.
- Rich debugging support via `ANYCLAUDE_DEBUG`
- Supports specifying reasoning effort and service tier
## Codebase
- Added CI
## Remaining issues
- GPT-5 often fails to use the native tool calls. These failures seems intermittent.
