Update changelogs from fern repo (#3864)

Author: fern-support

fern/products/sdks/overview/typescript/changelog/2026-02-26.mdx

@@ -1,3 +1,11 @@
+## 3.51.6
+**`(chore):`** In downloadFiles mode, install only the configured formatter/linter
+packages instead of the full dependency tree when outputting source files
+only. This replaces the ~1.8s full `pnpm install` with a targeted
+`pnpm add` of just the check:fix packages (e.g. @biomejs/biome,
+prettier, oxfmt, oxlint).
+
+
 ## 3.51.5
 **`(fix):`** Fix duplicate identifier collision in serialization schemas when two different packages
 define types with the same name. The schema generator now tracks directly imported type