Update Documentation

Files to review and update

1. README.md — project overview, feature list, test counts, available abilities table, project structure tree
2. readme.txt — WordPress.org readme, feature list, changelog (add entry if releasing)
3. docs/ARCHITECTURE.md — evolution history, testing section, codebase overview, model stats
4. tests/TESTING.md — test counts, test structure, commands
5. CLAUDE.md — key files table, ability count, test counts

How to update

1. Read current code state — check src/extensions/abilities/index.js for ability count, npm test output for test count, package.json for version
2. Diff against docs — find outdated numbers, missing abilities, stale file references
3. Update — fix counts, add missing entries, remove references to deleted files
4. Don't invent — only document what exists in the code. Don't add aspirational features.
5. Keep tone consistent — match the existing writing style in each file
6. Lint — if any JS/PHP files were touched, lint them