Add 15 sources: video, animation, environment

[TMHSDigital]

Summary

Grows the three thinnest categories (video 8 to 13, animation 12 to 17, environment 13 to 18). Every entry quotes a dated line from the live licence page (2026-10-04); where terms were unclear the entry is needs-review.

• Video: Big Buck Bunny, Sintel, Tears of Steel (CC-BY-3.0, active); Clipstill and Vidsplay (needs-review, games not named)
• Animation: five Quaternius packs (CC0, active). Notes the new Quaternius Asset License (QAL v1, 2026-08-28) is not retroactive: "the version in effect at the time you obtained the Assets governs"
• Environment: NLS Finland DEM (CC-BY-4.0) and swisstopo swissALTI3D (active); Overture Maps, NASA deep star maps, AHN Netherlands (needs-review)
• Counts synced to 392; node site/validate.mjs passes.

Rejected for unreadable or restrictive terms: ESA (educational/editorial only), Rokoko, Videvo, Mazwai, Videezy, Life of Vids.

I re-read the Quaternius and Blender licence pages myself; the other quotes are from the research agents' fetches.

🤖 Generated with Claude Code