- Add GetAllConfig/DeleteConfig methods to storage interface - Implement config set/get/list/unset subcommands with JSON support - Add comprehensive tests for config operations - Create CONFIG.md with full documentation and examples - Update README.md with config section - Support namespace conventions (jira.*, linear.*, github.*, custom.*) Closes bd-60 Amp-Thread-ID: https://ampcode.com/threads/T-33db7481-de7c-475e-b562-6afb7fb4bc7a Co-authored-by: Amp <amp@ampcode.com>