nx_vcodec_nf.nx

nx_vcodec_nf.nx -- LEARNED decoder-side RESTORATION FILTER (NEURAL track rung 1, task #46; operator 2026-07-07: "achieve true neural sota as we climb ... and these things are all going live"). A data-TRAINED piecewise-linear restorer (RAISR/Wiener-class -- the same family as AV1's loop restoration): every interior pixel of the DEBLOCKED recon is classified by its local gradient (flat + 4 directions x 2 strengths = 9 classes) inside a qp band (3 bands), and restored by that class's TRAINED 3x3+bias filter (Q12 integer weights, trained by nx_vcodec_nf_train on (our-codec-recon -> source) pairs from REAL frames -- no floats anywhere, sovereign end to end). DISPLAY-PATH ONLY by design: the P-reference chain keeps the unfiltered recon (bit-exactness of the codec is untouched; a receiver applies this after decode, before YUV->RGBA). The trained table is caller-provided (vc_nf_load from the GENERATED nx_vcodec_nf_table.nx fills it) -- this module stays allocation-free and wasm-clean. license_tier: ORIGINAL