Add the retry overlay file and register it in workflow.yaml

Completes the prior commit: 408/429 join 5XX via x-speakeasy-retries overlay.
Verified offline with `speakeasy overlay apply`: statusCodes -> [5XX, 408, 429].

Co-Authored-By: Claudypoo <288921227+claudypoo@users.noreply.github.com>

Author: wassname

.speakeasy/overlays/retry-transient-status-codes.overlay.yaml

@@ -0,0 +1,11 @@
+overlay: 1.0.0
+x-speakeasy-jsonpath: rfc9535
+info:
+  title: Retry request-timeout and rate-limit responses
+  version: 0.0.0
+actions:
+  - target: $["x-speakeasy-retries"].statusCodes
+    description: Also retry 408 (request timeout) and 429 (rate limit), not just 5XX
+    update:
+      - "408"
+      - "429"

.speakeasy/workflow.yaml

@@ -11,6 +11,7 @@ sources:
             - location: .speakeasy/overlays/allof-simplify.overlay.yaml
             - location: .speakeasy/overlays/boolean-query-params.overlay.yaml
             - location: .speakeasy/overlays/fix-nullable-pagination.overlay.yaml
+            - location: .speakeasy/overlays/retry-transient-status-codes.overlay.yaml
         output: .speakeasy/out.openapi.yaml
         registry:
             location: registry.speakeasyapi.dev/openrouter/sdk/open-router-chat-completions-api