nx_jpeg_huff_enc.nx

nx_jpeg_huff_enc.nx -- SOVEREIGN JPEG baseline Huffman ENCODE substrate (J1 of the sovereign JPEG encoder yardstick, for the patent-free codec RD head-to-head). The JPEG arc was decode-only; this is the missing encode side. Provides the STANDARD ITU-T T.81 Annex K.3 luminance Huffman tables (DC + AC) as canonical code/size lookups, the JPEG magnitude-category + sign-magnitude additional-bits encoding, and DC/AC symbol emission over the shared MSB-first bit writer (nx_h264_bitwriter, reused as the generic hardware-rung bit primitive -- DRY). JPEG/Annex K is fully public since 1992 and patent-expired -> patent-clean. Self-proof = encode->decode round-trip (no 3rd party). The byte 0xFF-stuffing belongs to the scan-writer stage (J3), not here. license_tier: ORIGINAL