nx_interp_ex_gate.nx

nx_interp_ex_gate.nx -- proves + MEASURES sovereign dead-reckoning extrapolation (nx_interp ip_sample_ex): during a LOSS BURST (rt runs past the newest snapshot) the peer keeps MOVING from estimated velocity instead of freezing, capped at a safe horizon so long loss holds (bounded) rather than diverging. 1) extrapolation tracks truth during a loss burst (measured err ~0 on steady motion) 2) EXCEED vs hold (neg-control = NET-R1 freeze): extrap_max_err << hold_max_err (measured) 3) horizon cap (neg): beyond max_extrap_ms it HOLDS (status 3, bounded) -- no runaway divergence 4) interior unchanged: ip_sample_ex delegates to ip_sample for in-bracket rt (regression) 5) no-data (neg): empty history -> 0 Built nx_cc_sovereign -> nxasm_x86 (no gcc, no .sh). license_tier: ORIGINAL