nx_capgraph_derive_gate.nx

nx_capgraph_derive_gate.nx -- the gate for nx_capgraph_derive_lib: level thresholds, the journal row parser, and the progress-rail lookup. WHY: the progress rail was proven only by a LIVE neg-control (drop an edge, watch it record). That is real evidence but it is not a standing tooth -- it proves the rail worked ONCE, on one machine, on one day. These teeth are the standing version, and they cover the parts a live run cannot easily reach: threshold BOUNDARIES (off-by-one is invisible in a live run where nothing sits on the boundary), NEGATIVE level parsing (-1 UNMEASURED must survive a round-trip or every unmeasured node silently reads as 1), and PREFIX safety in the lookup. license_tier: ORIGINAL No hw writes (Rule 26). expect_exit: 0