Update changelogs from fern repo (#4934)

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

Author: fern-support

fern/products/cli-api-reference/cli-changelog/2026-04-14.mdx

@@ -1,3 +1,9 @@
+## 4.68.5
+**`(chore):`** Migrate CLI to a unified error system using a shared CliError class with typed error codes.
+Error codes drive Sentry reporting eligibility; unclassified errors are temporarily suppressed
+from Sentry until all call sites are migrated.
+
+
 ## 4.68.4
 **`(fix):`** Deduplicate global headers when merging IRs from multiple OpenAPI specs. Previously, if multiple specs shared the same `globalHeaderOverrides` from `generators.yml`, the same header would appear once per spec in the merged IR.