Implements the sentryagent-idp Rust SDK crate (sdk-rust/) with:
- TokenManager with Arc<Mutex<TokenCache>> for thread-safe token caching
- AgentIdPClient with full method coverage: agents, oauth2, credentials, audit, marketplace, delegation
- Error hierarchy via thiserror (AgentIdPError enum)
- All model types with serde derive
- 429 RateLimited handling with Retry-After parsing; zero unwrap() calls
- Unit tests (mockito), doc tests, and integration tests (#[ignore])
- quickstart example, full README, cargo doc clean
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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