feat: add animated GIFs + clean vault

GIFs (Remotion-rendered, FFmpeg palette-optimized):
- wiki/meta/wiki-graph-grow.gif (285KB, 6s, 15fps)
  Shows knowledge graph nodes appearing, coloring by type, edges connecting
  Color-coded: cyan=navigation, blue=concepts, purple=entities, green=sources
- wiki/meta/workflow-loop.gif (227KB, 5s, 15fps)
  Animated 4-step cycle: Drop Source → Claude Reads → Wiki Grows → Query
README: both GIFs shown side-by-side after the cover

Copyright clean-up (committed together):
- Removed Nate Herk source page and all 13 references
- Vault now 100% original content (3 concepts + 1 entity + navigation)

.obsidian/workspace.json

@@ -189,6 +189,9 @@
   },
   "active": "c0d470cf50ffdf79",
   "lastOpenFiles": [
+    "README.md.tmp.224546.1775555737152",
+    "wiki/meta/workflow-loop.gif",
+    "wiki/meta/wiki-graph-grow.gif",
     "wiki/Wiki Map.canvas.tmp.224546.1775555483542",
     "wiki/entities/Andrej Karpathy.md.tmp.224546.1775555435117",
     "wiki/concepts/Hot Cache.md.tmp.224546.1775555433665",
@@ -206,11 +209,8 @@
     "_attachments/images/skool-hub/sq-portrait-clean.png",
     "_attachments/images/skool-hub/sq-10.png",
     "_attachments/images/skool-hub/sq-01.png",
-    "_attachments/images/skool-hub/pro10-var-20.png",
-    "_attachments/images/skool-hub/pro10-var-10.png",
     "_attachments/images/skool-hub",
     "_attachments/images",
-    "_attachments",
     "wiki/entities/_index.md",
     "wiki/meta/dashboard.md",
     "wiki/sources/_index.md",