Fix activity detail to show provenance/inputs

- Include provenance in activity object_data when creating activities
- Add fallback: look up asset from registry if activity lacks provenance
- Existing activities now show inputs by looking up the asset

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

server.py

@@ -638,10 +638,23 @@ async def ui_activity_detail(activity_index: int, request: Request):
     media_type = obj.get("mediaType", "")
     description = obj.get("summary", "") or obj.get("content", "")
 
-    # Provenance from object
+    # Provenance from object - or fallback to registry asset
     provenance = obj.get("provenance", {})
     origin = obj.get("origin", {})
 
+    # Fallback: if activity doesn't have provenance, look up the asset from registry
+    if not provenance or not origin:
+        registry = load_registry()
+        assets = registry.get("assets", {})
+        # Find asset by content_hash or name
+        for asset_name, asset_data in assets.items():
+            if asset_data.get("content_hash") == content_hash or asset_data.get("name") == obj_name:
+                if not provenance:
+                    provenance = asset_data.get("provenance", {})
+                if not origin:
+                    origin = asset_data.get("origin", {})
+                break
+
     # Type colors
     type_color = "bg-green-600" if activity_type == "Create" else "bg-yellow-600" if activity_type == "Update" else "bg-gray-600"
     obj_type_color = "bg-blue-600" if "Image" in obj_type else "bg-purple-600" if "Video" in obj_type else "bg-gray-600"
@@ -1577,20 +1590,26 @@ def _register_asset_impl(req: RegisterRequest, owner: str):
     save_registry(registry)
 
     # Create ownership activity
+    object_data = {
+        "type": req.asset_type.capitalize(),
+        "name": req.name,
+        "id": f"https://{DOMAIN}/objects/{req.content_hash}",
+        "contentHash": {
+            "algorithm": "sha3-256",
+            "value": req.content_hash
+        },
+        "attributedTo": f"https://{DOMAIN}/users/{owner}"
+    }
+
+    # Include provenance in activity object_data if present
+    if req.provenance:
+        object_data["provenance"] = req.provenance
+
     activity = {
         "activity_id": str(uuid.uuid4()),
         "activity_type": "Create",
         "actor_id": f"https://{DOMAIN}/users/{owner}",
-        "object_data": {
-            "type": req.asset_type.capitalize(),
-            "name": req.name,
-            "id": f"https://{DOMAIN}/objects/{req.content_hash}",
-            "contentHash": {
-                "algorithm": "sha3-256",
-                "value": req.content_hash
-            },
-            "attributedTo": f"https://{DOMAIN}/users/{owner}"
-        },
+        "object_data": object_data,
         "published": now
     }