refactor: clean up outdated references and orphan files

- Fix __init__.py docstring: Mybot → Myclaude
- Remove stale .gitignore entries (workspace/, knowledge/)
- Delete orphan package-lock.json from Python project
- Update README: project structure, commands, env vars
- Replace all myclaude chat references with myclaude
- Update defaultWorkingDirectory examples to ~/workspace
- Add MYCLAUDE_WORKSPACE_ROOT documentation

.gitignore

@@ -4,8 +4,8 @@ __pycache__/
 *.egg-info/
 dist/
 build/
-workspace/
-knowledge/
+# Removed: workspace/ is now external (~/workspace by default)
+# Removed: knowledge/ is no longer used
 
 .claude/
 .obsidian/