set_layer_transition

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Set how a layer ENTERS at the start of its on-timeline window and LEAVES at the end, instead of popping. The transition is EDGE-RELATIVE — only a length and a look are stored — so it rides the edge through every later trim, slide or clip retime. Prefer this over fade_layer / apply_preset whenever the intent is 'enters and leaves nicely': those write opacity keyframes at ABSOLUTE frames, which strand themselves the moment the edge moves, and clutter the timeline lanes. A layer created WITH a `block` is born carrying a short fade at each edge — whether you passed the block or the editor minted one — so check `inspect_layers` before adding one, rather than assuming there is none. Layers created before this default existed, and any edge cleared to "cut", carry nothing and do need setting. A layer with NO block is always-present, has no edges, and a transition on it is inert. Video clips default to a hard cut, because a hard cut between shots is the grammar of short-form video. kind "cut" clears the edge back to a hard cut. The length is a request: when the window is too short to hold both ramps they are squeezed proportionally at render time, and the stored values are left intact.