prismtty 0.2.6

Fast terminal output highlighter focused on network devices and Unix systems
Documentation
## Summary

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## Validation

- [ ] `cargo fmt --check`
- [ ] `cargo test`
- [ ] `cargo clippy --all-targets -- -D warnings`
- [ ] Regenerated completions if CLI flags or command help changed
- [ ] Updated `README.md` or `CHANGELOG.md` for user-facing behavior changes

## Data Handling

- [ ] I used synthetic fixtures only
- [ ] I did not include real terminal captures, credentials, customer names, personal filesystem paths, or trace files from sensitive sessions

## Release/Packaging

- [ ] Release, Homebrew, or workflow changes remain reproducible from checked-in scripts