fix: set usePollingTraps in event loop activation path to stop SignalSender

src/bun.js/bindings/BunDebugger.cpp

@@ -1035,7 +1035,11 @@ extern "C" void VM__cancelStop(JSC::VM* vm)
 // Called from Zig when the event loop path activates the inspector.
 // Ensures runtimeInspectorActivated is set so that connect() and
 // interruptForMessageDelivery() use STW-based message delivery.
+// Also enables polling traps so that:
+// 1. The SignalSender stops its retry loop (it checks usePollingTraps)
+// 2. Future NeedDebuggerBreak traps are delivered reliably via polling
 extern "C" void Bun__setRuntimeInspectorActivated()
 {
     Bun::runtimeInspectorActivated.store(true);
+    JSC::Options::usePollingTraps() = true;
 }