Duplicate a trailer from its current plan onto a new draft (free).

Duplicating a trailer makes a NEW draft trailer that carries the source trailer's CURRENT plan — every beat with its edits, its hook, its intent, its montage marks, its black interludes and its closing sequence — and the choices made on the trailer itself (its shape, its audio policy, the narrator cast for it, its delivery class, its film finish, its quiet track and its name), and leaves the source trailer untouched. Nothing rendered rides along: no takes, cuts, masters, versions, share links or coverage reports. It is free and renders and reserves nothing; the copy's plan is queued for coverage, and its next step is approve_trailer_plan on the NEW trailer's jobId (CLI: trailer approve-plan <newJobId>). Any status may be duplicated — a draft, a trailer in review or complete, a failed one — as long as its plan reads as a plan today; one that does not is refused with 409 trailer_state_invalid (details.refusal.code: trailer_duplicate_no_plan) and nothing is created. A given title is the copy's DISPLAY NAME — the name its lists show it by — and never a title for its plan, which comes along unchanged; without one the copy keeps the source's name. NOT metered and NOT confirmed. Requires Idempotency-Key. Scope: story:write.