sdk-rust-v4.2.0

Rust SDK v4.2.0

Install

cargo add relaycast@4.2.0

What's Changed

• [codex] Refactor engine architecture helpers by @willwashburn in #209
• [codex] Add engine changelog by @willwashburn in #210
• refactor: cast-only engine; SDK owns the base-URL default by @willwashburn in #211

Full Changelog: sdk-python-v0.2.0...sdk-rust-v4.2.0