Fix V1.8 model card references

README.md

@@ -47,7 +47,7 @@ The locked test split contains 120 songs and 503 authored/time charts. Exact-slo
 
 These metrics compare against one authored chart even though chart design permits multiple valid answers. They do not establish human-rated groove, fun, or playability. The release has one training seed and no fair same-split V1.6/V1.7 retraining baseline.
 
-Known limitations include weak note-type decisions relative to onset placement, under-generation of rolls/balloons, repetitive slot-mode motifs, and beat-grid ambiguity outside stable 4/4 material. See the [V1.8 release report](https://github.com/JacobLinCool/SoftChart/blob/main/V18_RELEASE.md) for scope and failure analysis.
+Known limitations include weak note-type decisions relative to onset placement, under-generation of rolls/balloons, repetitive slot-mode motifs, and beat-grid ambiguity outside stable 4/4 material.
 
 ## Use