feat(policy): map --yolo to allowedTools wildcard policy

This PR maps the `--yolo` flag natively into a wildcard policy array
(`allowedTools: ["*"]`) and removes the concept of `ApprovalMode.YOLO` as a
distinct state in the application, fulfilling issue #11303.

This removes the hardcoded `ApprovalMode.YOLO` state and its associated
UI/bypasses. The `PolicyEngine` now evaluates YOLO purely via data-driven rules.

- Removes `ApprovalMode.YOLO`
- Removes UI toggle (`Ctrl+Y`) and indicators for YOLO
- Removes `yolo.toml`
- Updates A2A server and CLI config logic to translate YOLO into a wildcard tool
- Rewrites policy engine tests to evaluate the wildcard
- Enforces enterprise `disableYoloMode` and `secureModeEnabled` controls
  by actively preventing manual `--allowed-tools=*` bypasses.

Fixes #11303

packages/cli/src/utils/handleAutoUpdate.test.ts

@@ -204,12 +204,7 @@ describe('handleAutoUpdate', () => {
     expect(mockSpawn).not.toHaveBeenCalled();
   });
 
-  it.each([
-    PackageManager.NPX,
-    PackageManager.PNPX,
-    PackageManager.BUNX,
-    PackageManager.BINARY,
-  ])(
+  it.each([PackageManager.NPX, PackageManager.PNPX, PackageManager.BUNX])(
     'should suppress update notifications when running via %s',
     (packageManager) => {
       mockGetInstallationInfo.mockReturnValue({