Several libcpp headers lack file extensions. Added a first line pattern for recognition. https://github.com/llvm/llvm-project/blob/main/libcxx/include/random)](https://github.com/llvm/llvm-project/blob/main/libcxx/include/random Before: <img width="1229" height="512" alt="before" src="https://github.com/user-attachments/assets/fe62f904-73c9-494e-adf5-e5f259fab611" /> After: <img width="1229" height="512" alt="after" src="https://github.com/user-attachments/assets/a68b4242-61b7-4dba-a12e-9424be4b06dc" /> Release Notes: - Added first-line C++ language detection for extensionless libcpp headers.