* feat: add preview, create, and validate CLI commands
Add three new top-level CLI commands for the data-designer workflow:
- `data-designer preview` - generate preview datasets for fast iteration
- `data-designer create` - create full datasets and save to disk
- `data-designer validate` - validate configuration files
Also includes:
- Move wait_for_navigation_key() UI primitive from preview.py to ui.py
- Add KeyPressEvent type annotations to all key binding handlers in ui.py
- Refactor cli/utils.py into cli/utils/ package with config_loader module
- Comprehensive test coverage for all new commands
* fix: update pythonjsonlogger import and clean up dev dependencies
- Update pythonjsonlogger import to use newer JsonFormatter API
- Consolidate dev-dependencies into [dependency-groups] dev section
- Remove unnecessary test cli/utils __init__.py
* small E
* address greptile feedback
* organize CLI commands into rich help panels
Group top-level commands under "Generation" and "Setup" panels
for clearer help output.
* refactor config loader to parse files directly and auto-detect config format
- Parse YAML/JSON files into dicts before passing to from_config,
providing format-specific error messages for parse failures
- Auto-detect DataDesignerConfig format (columns at top level) and
wrap it into BuilderConfig so users can provide either format
- Clean up Python module loading with try/except/finally for reliable
sys.modules and sys.path cleanup
- Add comprehensive tests for parsing, validation, and auto-wrapping
* fix sys.path cleanup in config loader and simplify tests
- Use pop(0) instead of remove() to precisely undo the insert(0, ...)
and avoid accidentally removing a different matching path entry
- Replace MagicMock with real DataDesignerConfigBuilder in tests
* move config format auto-detection into from_config
Centralize the shorthand DataDesignerConfig detection (columns at
top level without a data_designer wrapper) in
DataDesignerConfigBuilder.from_config so all callers benefit, not
just the CLI config loader. Simplify config_loader to delegate file
parsing and format normalization entirely to from_config.
* extract GenerationController from CLI commands
Move shared generation logic (preview, validate, create) out of the
individual Typer command functions into a dedicated GenerationController,
matching the existing controller pattern (DownloadController, etc.).
The command functions now delegate to the controller, keeping them as
thin entry points. Tests updated accordingly — command tests verify
delegation while controller tests cover the full behavior.
* harden sys.path cleanup and add explanatory comments
Use sys.path.remove() instead of checking sys.path[0] so cleanup
succeeds even when exec_module inserts entries at index 0. Drop
unnecessary spec=DataDesignerConfigBuilder from test mocks.
* check stdout TTY in preview interactive mode detection
Previously only stdin was checked, so piping stdout (e.g.
`dd preview cfg.yaml | head`) would still attempt interactive
browsing. Now both stdin and stdout must be a TTY.
