feat: geometric graph topology + module pages + phantom link cleanup

Graph topology (Metatron's Cube pattern — 1 center + 12 outer nodes):
- index: now links to ALL 12 other nodes (complete hub)
- Inner ring cycle: hot→log→overview→dashboard→concepts/_index→entities/_index
  - Added: hot↔WikiMap, log↔sources/_index, dashboard↔concepts/_index
  - Added: entities/_index↔hot, entities/_index↔LLM Wiki Pattern
  - Added: sources/_index↔log, sources/_index↔entities/_index
- Outer ring: concepts connected in triangle + Karpathy/sources cross-linked
  - Added: dashboard↔Compounding, entities/_index↔LLM Wiki Pattern

graph.json physics for geometric arrangement:
- repelStrength: 80 (strong push-apart for uniform spacing)
- linkStrength: 3.0 (locks ring geometry)
- linkDistance: 80 (tighter rings)
- centerStrength: 0.25 (moderate center pull)
- nodeSizeMultiplier: 2.0 (hub nodes visually dominant)
- Added colors: questions=yellow, comparisons=red, nav=teal

Phantom links removed from Hot Cache.md:
- Removed [[Page A]], [[Page B]], [[New Page 1]], [[Existing Page]]

New module pages:
- wiki/questions/How does the LLM Wiki pattern work.md
- wiki/comparisons/Wiki vs RAG.md
- Adds questions/ and comparisons/ domains to the graph (yellow + red nodes)

.obsidian/graph.json

@@ -7,52 +7,24 @@
   "showOrphans": false,
   "collapse-color-groups": false,
   "colorGroups": [
-    {
-      "query": "path:wiki/entities",
-      "color": {
-        "a": 1,
-        "rgb": 12945088
-      }
-    },
-    {
-      "query": "path:wiki/concepts",
-      "color": {
-        "a": 1,
-        "rgb": 5227007
-      }
-    },
-    {
-      "query": "path:wiki/sources",
-      "color": {
-        "a": 1,
-        "rgb": 6986069
-      }
-    },
-    {
-      "query": "path:wiki/meta",
-      "color": {
-        "a": 1,
-        "rgb": 5676246
-      }
-    },
-    {
-      "query": "path:wiki",
-      "color": {
-        "a": 1,
-        "rgb": 5676246
-      }
-    }
+    { "query": "path:wiki/entities",    "color": { "a": 1, "rgb": 12945088 } },
+    { "query": "path:wiki/concepts",    "color": { "a": 1, "rgb": 5227007  } },
+    { "query": "path:wiki/sources",     "color": { "a": 1, "rgb": 6986069  } },
+    { "query": "path:wiki/questions",   "color": { "a": 1, "rgb": 14474410 } },
+    { "query": "path:wiki/comparisons", "color": { "a": 1, "rgb": 13724009 } },
+    { "query": "path:wiki/meta",        "color": { "a": 1, "rgb": 5676246  } },
+    { "query": "path:wiki",             "color": { "a": 1, "rgb": 4473924  } }
   ],
   "collapse-display": true,
   "showArrow": true,
   "textFadeMultiplier": -1,
-  "nodeSizeMultiplier": 1.8,
-  "lineSizeMultiplier": 1.2,
+  "nodeSizeMultiplier": 2.0,
+  "lineSizeMultiplier": 0.8,
   "collapse-forces": false,
-  "centerStrength": 0.5,
-  "repelStrength": 20,
-  "linkStrength": 1,
-  "linkDistance": 385,
-  "scale": 0.48198745386564384,
+  "centerStrength": 0.25,
+  "repelStrength": 80,
+  "linkStrength": 3.0,
+  "linkDistance": 80,
+  "scale": 1.2,
   "close": false
-}
+}