nx_treediverge_beat.nx

nx_treediverge_beat.nx -- no-arg BEAT for the ONE clock: the standing cross-tree divergence gauge (debt 1785622769: divergence must be caught the day it appears, not by archaeology). Composes the three PROVEN instruments through tr_run_capture -- zero detector logic duplicated: nx_treediff regenerates the NAS manifest, nx_treediverge compares it against the authoring manifest (pushed fresh at every session start by the treecanon SessionStart hook), nx_treecanon_gate re-runs the canon verdict. APPENDS one evidence line per run to the trend log -- including BEAT-FAIL lines (a beat with no evidence line is a claim; failure lines are evidence too). The BURN-DOWN is the point: divergent= over time IS the 8,258-file fork shrinking, minable from the trend file. Scheduler contract: the tickless clock (clock_jobs.tsv / the clockjobs- store plane) fork+execs this elf with NO args from cwd nishihost. argv[1]=authoring-manifest argv[2]=trendfile override the defaults for testing (argv[1] pointed at a missing file is the negative control: nx_treediverge REFUSES by its own non-vacuity law and this beat must append BEAT-FAIL + exit 1, never a comforting line). trend line: <epoch>\tDIVERGE <envelope, newlines as ' | '>\tGATE rc=<rc> <verdict line>\n license_tier: ORIGINAL No hw writes (Rule 26). expect_exit: 0