_drv_f2_gate.nx

_drv_f2_gate.nx -- gate for the FEDERATED DRIVER REGISTRY (X-DRV-F2). NO mocks. Proves the NETWORK EFFECT with real measurement + real signatures: (0) MEASURE -- emit+run the two candidate configs (lean, verbose) on the sovereign emu and read their REAL emu-steps (lean < verbose). No fabricated perf -- the reports carry these. (1) SIGN -- build TWO nodes' signed reports (node A: verbose; node B: lean), each ed25519-signed with that node's own identity key (genuine, 2 distinct nodes). (2) NETWORK EFFECT -- run nx_fed_registry on node A ALONE -> winner = verbose (its only data); run on A+B -> winner = lean. Assert two_node_winner_steps < one_node_winner_steps: the registry is MEASURABLY improved by the SECOND node's data (the winner flows back). (3) FLOW-BACK -- the 2-node winner config, re-run on the emu, achieves the registry's claimed steps (the recommendation really delivers; report perf == reality). (4) POISON-REJECTION -- a report with a BAD signature claiming steps=1 (would win if accepted) is REJECTED -> the winner stays lean, NOT the poison. Only consenting, authentic data refines the registry (you cannot poison it with unsigned reports). Evidence -> knowledge/status/fed_registry.log (DRVF2GATE row). Sovereign. license_tier: ORIGINAL