Editor Project Export

Workflow

1. Read ../../references/EDITOR_PROJECT_EXPORT.md and ../../references/MLT_TOOLKIT.md.
2. If only the executable timeline exists, derive 05_post/editorial/editor_project.json from it.
3. If the user needs layered editing, build the advanced editor manifest with explicit bin clips, V/A tracks, placements, filters, transitions, subtitles, and notes.
4. Read kdenlive-export, shotcut-export, or both according to the requested target.
5. Query MLT services before relying on optional effects or transitions.
6. Run scripts/editor_project_export.py with source existence validation when media is available.
7. Parse and target-validate every generated XML project.
8. Never report that a GUI editor opened the project unless that editor was actually available and the integration check was performed.

Done

Every requested editor project file exists and passes target-specific structural validation, with project-relative media references and no invented private schema.