fix: wave 5b review blockers - suppressed memory key, finalizer merge, zero-image guard

backend/agents/runner.py

@@ -173,28 +173,31 @@ def run_agent_pipeline(
     ]
 
     orchestrator.stage("Agent wave 5b: evidence verification")
-    sheet_to_page = {s.get("sheet_number"): s.get("page_number") for s in sheets}
+    sheet_to_page = {str(s.get("sheet_number")): s.get("page_number")
+                     for s in sheets}
     verify_targets = select_findings(
         specialist_findings, clusters,
         max_checks=config.AGENT_VERIFY_MAX_CHECKS,
         severities=config.AGENT_VERIFY_SEVERITIES,
     )
     target_indexes = {id(f): i for i, f in enumerate(specialist_findings)}
-    verify_scopes = [
-        AgentScope(
+    verify_scopes = []
+    for finding in verify_targets:
+        images = [
+            page_to_b64[sheet_to_page[str(name)]]
+            for name in (finding.get("sheets") or [])[:config.AGENT_CONFLICT_MAX_IMAGES]
+            if sheet_to_page.get(str(name)) in page_to_b64
+        ]
+        if not images:
+            continue  # never judge evidence against images we could not load
+        verify_scopes.append(AgentScope(
             scope_id=f"verify:{target_indexes[id(finding)]}",
             payload={
                 "finding_index": target_indexes[id(finding)],
                 "finding": finding,
-                "images_b64": [
-                    page_to_b64[sheet_to_page[name]]
-                    for name in (finding.get("sheets") or [])[:config.AGENT_CONFLICT_MAX_IMAGES]
-                    if sheet_to_page.get(name) in page_to_b64
-                ],
+                "images_b64": images,
             },
-        )
-        for finding in verify_targets
-    ]
+        ))
     verify_results = orchestrator.run_scopes(
         EvidenceVerifierAgent(usage), verify_scopes, config.AGENT_VERIFY_CONCURRENCY)
     suppressed = apply_verdicts(specialist_findings, verify_results)