Update changelogs from fern repo (#2443)

Co-authored-by: dsinghvi <10870189+dsinghvi@users.noreply.github.com>

Author: fern-support

fern/products/cli-api-reference/cli-changelog/2025-12-02.mdx

@@ -1,3 +1,7 @@
+## 2.15.1
+**`(fix):`** Improve CI environment detection to properly detect Azure Pipelines and other CI systems. This prevents unnecessary prompts when running `fern generate --docs` in CI environments.
+
+
 ## 2.15.0
 **`(feat):`** Infer example for literal and enum types when generating IR from OpenAPI and Fern Definition.