Update changelogs from fern repo (#1694)

Co-authored-by: Swimburger <[email protected]>

Author: fern-support

fern/products/cli-api-reference/cli-changelog/2025-10-31.mdx

@@ -2,6 +2,10 @@
 **`(feat):`** Add discriminated union base property and extend property examples to IR.
 
 
+## 0.102.1
+**`(fix):`** Fix discriminated union validation in `fern check` to include base properties and extends.
+
+
 ## 0.101.4
 **`(fix):`** Fix `coerce-enums-to-literals` setting to coerce single value enums to literals.