feat(remotion): asset-library catalog + Phase 0 (license firewall, @remotion/lottie, 30 CC0 characters)

- docs/ASSET_LIBRARY.md: curated catalog from the asset sweep (91 sources -> 62
  usable) + completeness-critic reality check; clean CC0/MIT tier, license/geo
  traps, and the 2.5D layered-scene plan (sky->room->furniture->device->character
  ->grain) to fix the "naked scene".
- deps: add @remotion/lottie@4.0.290 (runtime) + DiceBear (build-time devDep).
- scripts/gen-dicebear.mjs: generate 30 CC0 Open-Peeps characters OFFLINE (no
  runtime CDN) into public/illustrations/dicebear/ + a per-file assets.json ledger.
- scripts/check-assets.mjs: license-firewall CI guard — fails on any un-ledgered
  vendored asset.
- AssetSheet dev composition: proves vendored SVG -> staticFile() -> Remotion render
  (30 real characters render cleanly).
- NOTE: GitHub (Open Peeps/IRA/Notion git clones) + Gumroad (Lukasz) are geo-blocked
  headless here; those + Humaaans (Figma export) need a manual/mirror fetch.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

services/remotion/src/Root.tsx

@@ -2,6 +2,7 @@ import { Composition } from "remotion";
 import { ASPECTS } from "./lib/aspect";
 import { TEMPLATES } from "./templates";
 import { Three3DTest } from "./compositions/Three3DTest";
+import { AssetSheet } from "./compositions/AssetSheet";
 import {
   IlluminatedCircles,
   illuminatedCirclesSchema,
@@ -113,6 +114,16 @@ export const RemotionRoot: React.FC = () => {
         height={720}
       />
 
+      {/* Dev preview: vendored CC0 character library (not a customer template) */}
+      <Composition
+        id="AssetSheet"
+        component={AssetSheet}
+        durationInFrames={60}
+        fps={30}
+        width={1920}
+        height={1080}
+      />
+
       {/* Branded templates — each registered in all three aspects. A template may
           supply a dedicated component per aspect (componentsByAspect) when its
           design differs structurally; otherwise the shared `component` adapts