- Add 4-strategy resolution priority: CAS hash → file path → local discovery → global registry
- Add helper functions: isFilePath, workflowFileExists, findWorkflowInDir, findWorkflowInParents
- Refactor resolveWorkflowCasRef to support direct hash, explicit paths, and parent traversal
- Add comprehensive test suite with 24 tests covering all strategies and edge cases
- Support .workflow/ and .workflows/ directories with .yaml/.yml extensions
- All 60 tests pass across 5 test files
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>