- Add examples/ directory with three runnable examples:
  - basic_wait.rs: Simple duration waits with jitter
  - distributions.rs: Statistical distribution sampling
  - verbose_progress.rs: Verbose progress output demos
- Add benches/ directory with criterion benchmarks for all
  wait condition calculations
- Add criterion dev-dependency for benchmarking

- Update version from 0.4.0 to 0.4.1
- Add explicit [[bin]] entry for dozr main binary in Cargo.toml
- Update CHANGELOG.md with 0.4.1 release notes and comparison links

- Update examples.md to use current subcommand syntax (was using old flag syntax)
- Add benchmarks and runnable examples sections to TEST.md
- Update CHANGELOG.md to reflect documentation changes

- Short wait test (5s): tests 0-20s bucket with 1s update period
- Long wait test (21s): tests 21-60s bucket with 5s update period

Previously both tests used durations in the same adaptive bucket,
so they weren't actually testing different behavior.