DeepSeek Harness config migration plugin.
- Cross-platform (Windows/macOS/Linux)
- One-click export/import of DSH_HOME config
- Credential encryption (AES-256-GCM)
- External plugin migration (binary assets + junction/symlink rebuild)
- v1/v2 bundle compat, dry-run preview, only-missing mode
- 27 unit tests, 3-platform CI