docs(readme): Update README and add CLAUDE guidance (#10)

- Add CLAUDE.md with guidance for Claude Code, development commands, architecture overview, strategies and usage examples.
- Update README with features, quick start, detailed strategy and jitter explanations, configuration and testing instructions.
- Add .claude to .gitignore to exclude AI assistant state files.

Add PHP 8.3 to test matrix and bump `jbzoo/toolbox-dev` to ^7.1 (#8)

Release v7 (#6)

Minimal PHP version is 7.4 (#3)

Update deps

Update .gitattributes

Update PHP deps (#2)

GitHub Actions (#1)

* Small code style fixes
* Init GitHub Actions

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