47b5f9cec8
- Add blanket `impl Objective<V> for Fn(&mut Trial) -> Result<V, E>` so closures work directly with `optimize` - Rewrite optimize, optimize_async, optimize_parallel to accept `impl Objective<V>` with before_trial/after_trial hooks - Remove optimize_with, optimize_with_async, optimize_with_parallel - Remove max_retries and retry logic from Objective trait - Add explicit closure type annotations for HRTB inference - Convert FnMut test closures to Fn via RefCell/Cell