feat: add Claude settings symlink management

- Add claude-settings.json as source file in chezmoi repo
- Create symlink template for .claude/settings.json
- Update .chezmoiignore to prevent recursion
- Update TODO.md to track Claude configuration progress

home/.chezmoiignore

@@ -1,5 +1,6 @@
 hooks
 tool-versions
+claude-settings.json
 
 {{/* WSL Only Files */}}
 {{ if (not .wsl) }}
@@ -35,4 +36,4 @@ key.txt
 Documents/
 AppData/
 
-{{ end }}
+{{ end }}