Summary

• update README to match the current tree-first explorer, collapsed search/filter controls, clear filters action, and manual sorting flow
• refresh AGENTS.md and CLAUDE.md with the current code map, data flows, release steps, and core helper boundaries
• align release checklist and package metadata with the current plugin scope, and mark the original development plan as historical

Verification

• npm run lint
• npm run build
• npm test -- --runInBand
• JSON parse check for manifest.json and package.json