MLT Export

Workflow

1. Read ../../references/MLT_EXPORT.md and ../../references/EXECUTABLE_TIMELINE.md.
2. Validate the source timeline first.
3. Run scripts/mlt_export.py PROJECT --timeline PATH --output RELATIVE_PATH.
4. Parse the resulting XML and verify that every timeline event is represented in order.
5. If the user specifically requests Kdenlive or Shotcut, route to editor-project-export instead of labeling this generic file as native.
6. Do not add untested editor-private effects or UI metadata.

Done

A structurally valid MLT XML timeline exists with project-relative media resources and matching event durations.