nx_ecomat_trend_lib.nx

nx_ecomat_trend_lib.nx -- ADVANCEMENT vs EXPANSION: the honest growth decomposition over the durable maturity ledger (knowledge/status/ecosystem_maturity.log). THE DEFECT THIS EXISTS TO KILL (measured 2026-07-31): the rollup headline is sum_cur/sum_bar, so DECLARING a new domain raises the denominator and the grade FALLS while capability is unchanged. Read naively the ledger says 460 -> 434 permil = "we regressed". Read honestly it says the bar grew by 20 levels because 4 domains were declared. Conflating ADVANCEMENT (an existing domain climbing a rung) with EXPANSION (a new domain declared at the bottom) is the design flaw: a grade that punishes expansion trains the ecosystem to stop declaring frontiers. WHAT IS EXACT AND WHAT IS NOT -- this lib never invents precision (L011 self-ceiling honesty): * a transition where the domain COUNT DID NOT CHANGE has a stable cohort, so the entire delta in sum_cur IS advancement. EXACT, no assumption. * a transition that ADDED domains cannot be attributed from aggregates alone -- the ledger did not keep who contributed what. That span is counted AMBIGUOUS and is never silently folded into either bucket. The permanent fix is a per-domain ledger line (then every span is exact). Until that ships this lib reports its decomposable coverage explicitly instead of guessing. Pairs with nx_ecomat_lib (the rollup core that writes the ledger this reads). license_tier: ORIGINAL No hw writes (Rule 26).