Summary

Rewrites the packages/toolkit/README.md from a bare 35-line stub to a comprehensive package README with:

• Full feature list (10 detection rules, replay engine, React components, etc.)
• Complete subpath exports table with browser-safe annotations
• Programmatic usage examples for every subpath (core, scenarios, reporter, replay, react, fixtures)
• CLI command reference with all commands and options
• Trace format documentation with wire format examples
• Links to docs, migration guide, and issue tracker

The README is displayed on the npm package page (npmjs.com/package/@ocpp-debugkit/toolkit) and is included in the published tarball (verified with npm pack --dry-run).

Closes #82

Checklist

• packages/toolkit/README.md rewritten with all sections
• All code examples use correct, current API signatures (verified against src/)
• Subpath exports table matches actual package.json#exports
• CLI commands match actual src/cli/index.ts command definitions
• npm pack --dry-run confirms README is included in tarball
• Format check passes
• No changeset needed (docs-only, no package behavior change)