Update changelogs from fern repo (#5593)

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

Author: fern-support

fern/products/cli-api-reference/cli-changelog/2026-05-21.mdx

@@ -1,3 +1,27 @@
+## 5.37.0
+**`(feat):`** Propagate the per-spec `namespace:` declared in `generators.yml`
+through the raw specs manifest mounted into generator containers.
+`RawSpecsManifestEntry` now carries an optional `namespace` field
+populated from `OpenAPISpec.namespace` (also `OpenRPCSpec.namespace`
+and `GraphQLSpec.namespace`). Enables generators that opt into
+`generatorWantsSpecs` to route multi-spec workspaces by their
+workspace-declared namespace instead of inferring one from the
+runner-assigned filename. The new `fernapi/fern-cli` generator
+uses this to emit `.spec_under("<ns>", ...)` in the generated
+`main.rs` when the user namespaces their specs.
+
+
+**`(fix):`** Skip copying zero-byte `snippet.json` stubs from the workspace
+temp dir into the user's generated output. The local workspace
+runner pre-creates an empty `snippet.json` file and bind-mounts
+it into the generator container so the generator can optionally
+write per-endpoint code samples. Generators that emit a CLI
+binary (or any output without call-site snippets) leave it empty
+— copying the empty stub left a confusing 0-byte `snippet.json`
+in the user's output. The runner now stat's the tmp file and
+skips the copy when it's empty.
+
+
 ## 5.36.1
 **`(fix):`** Fix OpenAPI 3.1 importer to inherit path-level parameters (headers, query params) into operations.
 Previously, only operation-level parameters were processed, causing path-level headers like