David Gwilliam cdcdb7b172 feat(app): add direct CLI mode, validation framework, fixtures, and UI panel integration ...

- Add run_pipeline_mode_direct() for constructing pipelines from CLI flags
- Add engine/pipeline/validation.py with validate_pipeline_config() and MVP rules
- Add fixtures system: engine/fixtures/headlines.json for cached test data
- Enhance fetch.py to use fixtures cache path
- Support fixture source in run_pipeline_mode()
- Add --pipeline-* CLI flags: source, effects, camera, display, UI, border
- Integrate UIPanel: raw mode, preset picker, event callbacks, param adjustment
- Add UI_PRESET support in app and hot-rebuild pipeline on preset change
- Add test UIPanel rendering and interaction tests

This provides a flexible pipeline construction interface with validation and interactive control.

Fixes #29, #30, #31

2026-03-18 12:19:18 -07:00

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