nx_vcodec_dct2_rd_gate.nx

nx_vcodec_dct2_rd_gate.nx -- MEASURED head-to-head: the clean royalty-free integer DCT-II (tf=1) vs the shipped Walsh-Hadamard transform (tf=0), through the SAME real full codec, on the SAME real 768x768 H.264-decoded luma frame, at the SAME QP sweep. Both run via vc_enc_frame_packed_tf / vc_dec_frame_packed_tf (the only difference is the transform). We print both RD curves and the HONEST exceed metric = PSNR gain at MATCHED bitrate (linear interpolation of the DCT-II curve to each WHT operating point -- the BD-PSNR idea, not a cherry-picked QP). Correctness (independent decode bit-exact at every QP, both transforms) is the GREEN bar; the RD gain is MEASURED and printed raw -- never self-scored. [[feedback-no-wave-measured-exceed]] [[feedback-show-raw-output-no-overclaim]]