Read a planned draft trailer's plan check (its approval gate).

What the cut covers (the scope's features with the beats, 1-based, that cover each) and every finding with its fix; a blocked check refuses approve_trailer_plan (409 trailer_state_invalid, details.refusal.code: product_video_plan_blocked) and reserves nothing. It is LIVE: computed from the draft as it stands now, so a beat edited since the plan refreshes it on the next read. A trailer not planned from a feature map answers coverage: null with a note — never a 404. Planning a product video turns one feature of the project's feature map, or a named release and its features, and the project's recorded captures into an ordinary draft trailer — each beat names its capture, the stretch of it it plays, a narrated line, whether the beat keeps its own sound, and its depth — and it is free: it answers at once, the run is polled until it is ready, and the result is an ordinary capture-only draft trailer approved with approve_trailer_plan. A read: it never plans, renders or edits. Scope: story:read.