nx_wiki_walk_gate.nx

nx_wiki_walk_gate.nx -- REFEREE for the walkability metrics (modeled on nx_wiki_exceed_gate). Proves nx_wiki_walk_metrics MEASURES honestly + can SEE every case (no fabricated greens), via 3 hand-built framed-corpus fixtures: HEALTHY (3 pages, all reciprocally cross-linked, start reachable): reciprocity==100, orphans==0, dead-ends==0, reachability==100. SPARSE (3 pages, NO internal links at all): orphans high (>=66%), dead-ends==100%, reachability==33% (start only) -- proves full SENSITIVITY (it does NOT always report healthy). ONE-AXIS (HEALTHY but one page's outbound link removed -> exactly ONE dead-end and the reciprocity drops): dead-ends moves 0 -> >0 while orphans STAY 0 -- proves per-axis SPECIFICITY (greens can't be fabricated; moving one structural fact moves exactly the axes it should, not all-or-none). LIVE (the real live corpus): metrics RUN and assert the spine MEETS S-class structure -- orphans==0 AND dead-ends==0 AND reachability==100. GREEN iff all checks hold. Evidence -> knowledge/status/wiki_walk_gate.log. Sovereign: imports the organ + nx_framed_append + nx_syscalls. license_tier: ORIGINAL