cfgstore Config Author

Use this skill when the user asks to:

• design or implement application configuration
• load config from standard locations with overrides
• validate and normalize config
• refactor ad-hoc config code into go-cfgstore
• implement commands that read/write config

Mandatory references (read in order)

1. references/nonnegotiables.md
2. references/go-dt-paths.md (config usually touches files/paths)
3. references/doterr.md
4. references/clearpath.md (production code only)
5. references/cfgstore-package-notes.md (go-cfgstore catalog notes)