fix(verify): crash if no hard evidence of code execution

Before: script returned 0 (success) even if we couldn't verify code execution
- Debugger port not found → warning but continues
- Debugger not accessible → warning but continues

After: script returns 1 (failure) if we can't prove code executed
- Debugger port not found → ERROR and exit 1
- Debugger not accessible → ERROR and exit 1

Now enforces: "skrypt ma sie wywalic jesli dowodu nie ma"
(script should crash if there's no proof)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

scripts/test_verify.py

@@ -200,21 +200,27 @@ def main() -> int:
 
     # Guard: Check if debugger port found
     if not port:
-        print("⚠ Could not find debugger port (but extension installed OK)")
-    else:
-        print_success(f"Firefox debugger port: {port}")
+        print_error("Could not find debugger port in logs")
+        print_error("Extension installed but NO PROOF of code execution")
+        cleanup(xvfb_pid, webext_pid)
+        return 1
 
-        # Guard: Check debugger connectivity
-        if not test_debugger_connectivity(port):
-            print("⚠ Remote debugging not accessible (but extension installed OK)")
-        else:
-            print_success("Remote debugging protocol accessible")
-            print_success("Extension code VERIFIED executing")
-            print()
-            print("NOTE: Verified by:")
-            print("  - Extension installed without errors")
-            print("  - Background page loaded (debugger accessible)")
-            print("  - No JavaScript errors detected")
+    print_success(f"Firefox debugger port: {port}")
+
+    # Guard: Check debugger connectivity
+    if not test_debugger_connectivity(port):
+        print_error("Remote debugging not accessible")
+        print_error("Extension installed but CANNOT VERIFY code execution")
+        cleanup(xvfb_pid, webext_pid)
+        return 1
+
+    print_success("Remote debugging protocol accessible")
+    print_success("Extension code VERIFIED executing")
+    print()
+    print("NOTE: Verified by:")
+    print("  - Extension installed without errors")
+    print("  - Background page loaded (debugger accessible)")
+    print("  - No JavaScript errors detected")
 
     # Show process info
     print()