copy-on-write-lineage

name	copy-on-write-lineage
description	Use when designing copy-on-write media edits, immutable references, derived asset lineage, rights inheritance, replacement policies, and force/replace audit behavior.

Copy-on-Write Lineage

Use this skill when a media/text/timeline entity has downstream references.

Rules:

• Never overwrite referenced source media.
• Trim, caption burn, denoise, crop, or remix creates a derived asset.
• Derived assets record parent ids, operation, parameters, source hashes, and rights inheritance.
• To show a derived asset on the timeline, use an explicit projection such as clash production project-derived-overlay; it writes a derived-overlay item plus CAS apply metadata, and does not mutate canvas/timeline state by itself.
• Force replace must be explicit and auditable.
• Text nodes with downstream references follow the same rule as image/video.

Output a lineage plan before implementing destructive-looking edits.