nx_ecomat_domtrend_gate.nx

nx_ecomat_domtrend_gate.nx -- proves EXACT attribution: a domain that CLIMBED is never confused with a domain that was merely DECLARED. THE PAYOFF TOOTH IS T3+T4. The fixture moves sum_cur from 3 to 5 while the domain count goes 2->3. Given only the AGGREGATE ledger that span is unattributable -- nx_ecomat_trend must bucket all of it as AMBIGUOUS, which is exactly why live decomposability sat at 406 permil. Given the per-domain ledger the same span resolves to advance=1 (alpha climbed 2->3) and expansion=1 (gamma declared at 1). Same numbers in, a real answer out. That difference IS the debt being closed. license_tier: ORIGINAL No hw writes (Rule 26).