nx_share_convergence_gate.nx

nx_share_convergence_gate.nx -- THE DEDUP PROOF. I built nx_share_plane as a new who-may-see-what primitive and only afterwards found runtime/nx_rebac.nx, which calls itself "the ONE shared authorization plane for every Nishi surface" and exists precisely because the estate once had three incompatible authz philosophies. Mine would be a fourth. The irony is exact: nx_share_plane's whole justification was that shared gallery, shared contacts and gifts must not become three copies of one permission rule. The estate's law is to RETIRE a duplicate by PROVING CONVERGENCE, not by asserting redundancy. So this gate runs the SAME scenarios through both planes and compares verdicts, and it is deliberately built so that agreement is not the only outcome it can report: * an UNDECLARED divergence turns the gate RED -- two planes that disagree about who may see a photo is a privacy bug wearing a refactor's clothes; * a DECLARED divergence is printed with its reason and does NOT fail, because the point of the exercise is to find them. Two are declared below, and each one changes what "retire the duplicate" means. A gate that could only ever say "they agree" would prove nothing about a decision this consequential. license_tier: ORIGINAL expect_exit: 0