Merge branch '3.1' into 3.x

Author: cowtowncoder

release-notes/VERSION

@@ -20,7 +20,7 @@ implementations)
   method signatures
 #674: Smile parser does not update `StreamReadContext` index or entry count
 
-3.1.1 (not yet released)
+3.1.1 (27-Mar-2026)
 
 #387: Avro generator should enforce `StreamWriteConstraints.maxNestingDepth`
 #669: STRINGREF String reference outside of a namespace