Document illustrated MV motion workflow

[Hao0321]

What changed

• Document the illustrated music MV route for Video Autopilot and keep live-action montage separate.
• Specify frame-aligned typography, silhouette, transition, art rights and human visual review requirements.
• Include high-resolution same-aspect character art framing and short evidenced accents.

Verification

• Public source reviewed for creator-private data.
• git diff --check passed.
• Editkin's illustrated MV compiler and v4 audit/apply/render were exercised locally; this documentation PR does not claim an approved finished music video.