The 'full' match-regen scope now (1) removes this match's existing
keyframes, clip videos, outcome videos and finals up front, so a re-plan
that changes the clip count can't leave orphaned files that would get
globbed into the reassembled finals; and (2) runs strictly in order —
prompts -> keyframes -> clips + outcomes (assemble_finals=False) ->
assemble finals as the explicit last phase (4/4) via _reassemble_finals.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>