Phase 1 of docs restructuring: move all zettelkasten cards to a
temporary docs/zk/ subdirectory while preparing to build a new
Diataxis-based documentation structure.
- Move all existing markdown files from docs/ to docs/zk/
- Update zk-docs mise task to look in the new location
- Add docs/README.md explaining the restructuring plan
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
