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.

agent/client/client.go

@@ -649,7 +649,11 @@ func (c *AgentClient) sendCommandResult(action string, success bool, message str
 		c.postBeaconResult(payload)
 		return
 	}
-	_ = c.write(Message{Type: "command_result", Payload: payload})
+	// If the WebSocket write fails (stalled connection, reconnecting, etc.) fall
+	// back to the beacon HTTP path so the result is not silently dropped.
+	if err := c.write(Message{Type: "command_result", Payload: payload}); err != nil {
+		c.postBeaconResult(payload)
+	}
 }
 
 func (c *AgentClient) wsDownSinceTime() time.Time {