A.19.CN:9 - Anti‑patterns (and the fix)

Anti‑pattern	Symptom	Why it hurts	Fix (CN‑Spec slot)
Chartless number	“Latency = 120”	No unit/vantage → untestable	Fill `cs_basis` + `chart`
Normalization smuggling	Quiet “per‑unit” normalisation mid‑stream	Trend reversal	Declare UNM normalization references (`NormalizationMethodId` / `NormalizationMethodInstanceId`) + named invariants (see A.19.UNM)
Bridge-by-name	Reusing equal labels under different schemes	False comparability	Establish the exact F.9 relation and state the separate receiving use and tolerated loss
Free-hand averaging	An arithmetic mean is used without a model for the intended risk result	The number can answer the wrong question	Use A.9 to select a justified law, bound or separate-input result; declare an actual `Γ_fold` only for the selected fold
CN‑frame sprawl	Ten nearly‑identical CN‑frames	Cognitive debt	Use Registry + DRR; prefer reuse
Self-certification hidden by assignments	A holder authors the basis and later certifies it under a new role	A required independent check still examines that holder’s own basis	Apply §4.2 to actual participation in the exact edition; separate authority and examination, and keep uncertified use explicit when certification is not required