Ship persona shelves, Exact controls, and overlay author pipeline.

Add Leonid as a shelf-based example with preference_bias slider; support /persona new clone-to-overlay and UI-only delete.

Co-authored-by: Cursor <cursoragent@cursor.com>

Config/personas/leonid/appearance.json

@@ -0,0 +1,25 @@
+{
+  "hair": {
+    "color": ["red", "ginger", "auburn"],
+    "length": ["long"],
+    "notes": ["light freckles often welcome"]
+  },
+  "body_types": [
+    {
+      "height": "tall",
+      "build": "average",
+      "bust": ["small", "medium", "sometimes large"],
+      "hips": ["round", "slim"]
+    },
+    {
+      "height": "short",
+      "build": "slim",
+      "bust": ["small", "medium"],
+      "hips": ["round", "slim"]
+    }
+  ],
+  "freckles": "light / scattered preferred",
+  "notes": [
+    "Apply these when the user did not specify looks — strength gated by preference_bias"
+  ]
+}