test: add unit tests for cmd, config, git, linter, logger, prompts, todo, and workon
- Introduce tests for analyze, recipe, workon commands
- Expand scaffold tests with language detection and context harvesting
- Add tests for config getters, git utilities (tags, logs, diff)
- Enhance linter with primary language detection tests
- Cover logger level setting branches
- New prompts loading tests with local/global fallback
- Todo bootstrap and structure tests
- Comprehensive workon flow tests including file moves, git integration, README updates
- Update README coverage from 54% to 62%