Final sweep: Crucible fixes, Path Tracer polish, forge progress, tests green.

Align dashboard subtitle default and UpsertAgent tests with fleet label behavior; WebSocket coalesce and PathForge hardening; Crucible expanded ops and visual DV fixes; Vitest 610/610 and full test-suite pass; trim PROBLEMS.md to open items only.

server/web/src/context/WebSocketProvider.tsx

@@ -261,7 +261,16 @@ export function WebSocketProvider({ children }: { children: React.ReactNode }) {
             break;
           }
           case 'command_result': {
-            const p = msg.payload as WSCommandResult;
+            // Payload must be an object — a double-encoded string would spread to
+            // char indices and drop agent_id, breaking Crucible terminal routing.
+            let p = msg.payload as WSCommandResult | string;
+            if (typeof p === 'string') {
+              try {
+                p = JSON.parse(p) as WSCommandResult;
+              } catch {
+                break;
+              }
+            }
             const seq = ++cmdSeqRef.current;
             // Cap at 2000; command results are rare (operator-triggered) so this is plenty.
             // Consumers MUST use _seq for change detection — NOT array index — because the