_enc_replace_gate.nx

_enc_replace_gate.nx -- DIFFERENTIAL-REPLACEMENT of a COMPILER-INTERNAL (eve "inside like a compiler"): is the SEARCH-derived RV64 U-type encoder (nx_evo_enc's champion) behaviorally IDENTICAL to the Claude-authored assembler encoder? The operator's test on the toolchain's GUTS: "turn off Claude's encoder, emit ours, function the same." GREEN across the full in-range domain (every 7-bit opcode x every 5-bit register x an imm20 sample) = the team derived a verified drop-in for a piece of the assembler's inside. evo_enc_u is the SEARCH-emitted structure (_evo_enc_champ.nx), not hand-written. enc_u_ref is the REAL Claude encoder inlined VERBATIM from nxasm/asm_enc.nx:39-41 (cross-dir import doesn't resolve into _hdl_build; this is the production formula, citable). license_tier: ORIGINAL