Skip CDP test files gracefully in CI

tests/cdp_native_scrollbar_test.py

@@ -9,6 +9,12 @@ Flow:
 2. SendInput: move real mouse cursor to scrollbar, click-and-drag
 3. CDP: verify scrollTop changed, flag lifecycle, content integrity
 """
+import sys
+import pytest
+pytest.importorskip("websockets")
+if sys.platform != "win32":
+    pytest.skip("Windows-only (SendInput)", allow_module_level=True)
+
 import ctypes
 import ctypes.wintypes
 import json
@@ -265,7 +271,7 @@ async def run():
             })()
         """)
 
-        print(f"\n=== RESULTS ===")
+        print("\n=== RESULTS ===")
         print(f"  Total scroll delta: {total_delta}px")
         print(f"  Monotonic steps: {increasing}/{steps-1}")
         print(f"  Reversals: {reversals}")

tests/cdp_scrollbar_behavioral.py

@@ -3,6 +3,9 @@
 Tests the actual deployed code on localhost:8787 via Chrome DevTools Protocol.
 Verifies flag lifecycle, event handler wiring, and render suppression.
 """
+import pytest
+pytest.importorskip("websockets")
+
 import json
 import asyncio
 import urllib.request
@@ -255,7 +258,7 @@ async def run_tests():
             })()
         """)
         if result.get("has_children") == True:
-            print(f"  PASS: content rendered after drag release")
+            print("  PASS: content rendered after drag release")
             passed += 1
         else:
             print(f"  FAIL: {result}")