nx_chargen_param_gate.nx

nx_chargen_param_gate.nx -- CHARACTER-GEN-PARAMETRIC: a parameter vector becomes a DISTINCT, VALID character, reproducibly, across a RANGE -- proven end-to-end on the PROMOTED generator. WHY THIS GATE EXISTS (measured 2026-08-23, not assumed). nx_gamebench row 22 (character-gen-parametric, capv[22]=1 PARTIAL) was the board's LAST gap and the entire gap_queue. It is also the ONLY capability row in the whole board carrying NO reason: every neighbour that reached HAVE cites the same shape -- "flipped GAP->HAVE <date>: <organ> (certified part) + <gate> N/N GREEN, mutation-proven (<the mutant that drove it RED>)". nx_catalog measured the actual gap: the generators are LIVE (nx_body_gen PROMOTED+REGISTERED 77455 B, nx_body_proc PROMOTED+REGISTERED 75120 B) while nx_body_proc_gate / nx_bodygen_gate / nx_charactergen_gate are ALL **ABSENT**. The capability was never the missing thing; the proof binding it to the board was. This gate is that binding. Subject: ./nx_body_gen.elf -- the SERVING-ROOT binary, forked e2e (never an in-process re-derive) through gk_run_capture, the estate's deadlock-proven subprocess primitive. A hand-rolled pipe/fork/wait in a sibling gate wedged for 50+ minutes in production today (pid 2240, utime=0, wchan=pipe_wait, artifact frozen at its header): fixtures and subprocess come from nx_gatekit_lib, and this gate never re-rolls them. EVERY BOUND HERE IS READ OR MEASURED, NONE IS PICKED: * N (how many characters) is READ from the reference corpus that DEFINES validity (knowledge/rigfloor_msh.conf n_read). The generated set must be able to express at least the width of the corpus that defines "valid"; a smaller N could not. * the validity band (tris/parts) is READ from that same conf -- the floor organ owns those numbers, this gate restates none of them. * the radial sweep range is DERIVED AT RUNTIME from the generator's OWN reported defaults (a probe run with radial omitted makes the organ report radial0/tris0), scaled onto the floor's band. That linear sampling model is a HEURISTIC FOR CHOOSING SAMPLES ONLY -- its correctness is not assumed, it is CHECKED by the in-band tooth on every generated asset.