feat: online verification, node removals, and knowledge browser

Adds claim-bound online evidence records and citation verification scripts,
node removal transport/adapter, retrieval benchmark and owner-review tooling,
GraphCanvas/SourceDetail knowledge browser UI, and the ingest handoff helper.
Bumps the agents/gewu pack to the online-verification branch.

schema/v1/records/SearchRequest.schema.json

@@ -161,6 +161,11 @@
       "title": "Domain",
       "type": "array"
     },
+    "include_evidence": {
+      "default": true,
+      "title": "Include Evidence",
+      "type": "boolean"
+    },
     "limit": {
       "default": 20,
       "maximum": 50,