feat(gateway): wire safe-point runtime cancellation for agent.cancel

src/gateway/handlers/handlers.test.ts

@@ -251,6 +251,7 @@ describe('agent handlers', () => {
     getAgent: vi.fn(() => mockAgent),
     getSessionId: vi.fn(() => 'ws:conn-1'),
     isBusy: vi.fn(() => false),
+    cancel: vi.fn(() => false),
     setBusy: vi.fn(),
     setOnToolUse: vi.fn(),
   };
@@ -265,6 +266,7 @@ describe('agent handlers', () => {
   beforeEach(() => {
     vi.clearAllMocks();
     mockBridge.isBusy.mockReturnValue(false);
+    mockBridge.cancel.mockReturnValue(false);
     mockBridge.getAgent.mockReturnValue(mockAgent);
     mockAgent.process.mockResolvedValue('response text');
   });
@@ -399,11 +401,22 @@ describe('agent handlers', () => {
   });
 
   it('agent.cancel returns cancelled state', async () => {
-    mockBridge.isBusy.mockReturnValue(true);
+    mockBridge.cancel.mockReturnValue(true);
     const req: GatewayRequest = { id: 7, method: 'agent.cancel', params: { connectionId: 'conn-1' } };
     const result = await handlers['agent.cancel'](req) as GatewayResponse;
 
     expect((result.result as any).cancelled).toBe(true);
+    expect((result.result as any).message).toContain('Cancellation requested');
+    expect(mockBridge.cancel).toHaveBeenCalledWith('conn-1');
+  });
+
+  it('agent.cancel returns not-cancelled when no active operation exists', async () => {
+    mockBridge.cancel.mockReturnValue(false);
+    const req: GatewayRequest = { id: 8, method: 'agent.cancel', params: { connectionId: 'conn-1' } };
+    const result = await handlers['agent.cancel'](req) as GatewayResponse;
+
+    expect((result.result as any).cancelled).toBe(false);
+    expect((result.result as any).message).toContain('No active operation');
   });
 });