perf(server): eliminate O(N) heap cloning across standup, snippet, and graph handlers

server/src/handlers_v2/graph.rs

@@ -419,7 +419,7 @@ impl McpTool for VisualizeGraphHandler {
                 if query.is_empty() || included.contains(r.from.as_str()) || included.contains(r.to.as_str()) {
                     included.insert(r.from.as_str());
                     included.insert(r.to.as_str());
-                    to_draw.push(r.clone());
+                    to_draw.push(r);
                 }
             }
 

server/src/handlers_v2/notes.rs

@@ -254,11 +254,19 @@ impl McpTool for GenerateStandupReportHandler {
             .unwrap_or_default()
             .as_secs()
             .saturating_sub(req.hours_lookback * 3600);
-        let tasks = state.tasks.read_with(|items| items.iter().filter(|t| t.updated_at >= cutoff).cloned().collect::<Vec<_>>());
-        let changes = state.ledger.read_with(|items| items.iter().filter(|c| c.timestamp >= cutoff).cloned().collect::<Vec<_>>());
-        let summaries = state.session_summaries.read_with(|items| items.iter().filter(|s| s.namespace == req.namespace && s.timestamp >= cutoff).cloned().collect::<Vec<_>>());
-        let report = serde_json::json!({ "tasks_updated": tasks, "code_changes": changes, "session_summaries": summaries });
-        Ok(report.to_string())
+            
+        let report_str = state.tasks.read_with(|items| {
+            state.ledger.read_with(|changes| {
+                state.session_summaries.read_with(|summaries| {
+                    let filtered_tasks: Vec<_> = items.iter().filter(|t| t.updated_at >= cutoff).collect();
+                    let filtered_changes: Vec<_> = changes.iter().filter(|c| c.timestamp >= cutoff).collect();
+                    let filtered_summaries: Vec<_> = summaries.iter().filter(|s| s.namespace == req.namespace && s.timestamp >= cutoff).collect();
+                    let report = serde_json::json!({ "tasks_updated": filtered_tasks, "code_changes": filtered_changes, "session_summaries": filtered_summaries });
+                    report.to_string()
+                })
+            })
+        });
+        Ok(report_str)
     }
 }
 

server/src/handlers_v2/workspaces.rs

@@ -151,7 +151,7 @@ impl McpTool for SearchSnippetsHandler {
                 contains_ignore_ascii_case(&s.name, &query)
                     || contains_ignore_ascii_case(&s.description, &query)
                     || contains_ignore_ascii_case(&s.language, &query)
-            }).cloned().collect();
+            }).collect();
             serde_json::to_string(&results).unwrap_or_default()
         });
         Ok(data.to_string())