docs(compose): clip start and length are optional - #75
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Auto-timing lands: a clip with no start and no length plays its whole source, laid after the clip before it and overlapped by any transition between them. - "Join two clips" leads with the untimed form and keeps the hand-timed one below, since both render the same thing. - New "Timing is optional" section under the timeline model, with the default for each field and the two places timing is still required. - Reference tables corrected: clip fields, scene duration, and overlays, which no longer need a length the engine was discarding.
Rewrites the timing section around the container idea: a clip runs as long as its content does, never past its container, and "end" runs it to the container's end. Replaces four rules that disagreed (whole source on a track, whole scene in a scene, length required on text and images, overlay length discarded). Adds the music-bed and watermark worked examples and corrects the reference tables.
A clip is capped by its container, but "end" is the opposite request and asks for the container in full. On a source shorter than that it is impossible, and the job is rejected for outrunning its source.
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Documents the auto-timing change in rendobar/rendobar#586.
text/imageclips, and inside acomposition).startandlengthare mandatory,scenes[].durationdocuments the new source-derived default, andoverlaysno longer saysstartandlengthare required there. They never were used:desugarScenesoverwrote the length unconditionally."start": 0, "length": 7.4.Merge alongside the monorepo PR, not before it.