Add max and ultra reasoning efforts to the SDKs (#39662)

## What changed

- Add `max` and `ultra` to the TypeScript `ModelReasoningEffort` type.
- Add matching Python `ReasoningEffort` members and preserve them when SDK artifacts are regenerated.
- Update the Python model-selection examples to rank the new effort levels.

## Testing

- Cover serialization of both new Python enum members while continuing to accept unknown future values.

GitOrigin-RevId: 1412b77bdbb2530f5d38921cdea971dd34458353

sdk/typescript/src/threadOptions.ts

@@ -2,7 +2,14 @@ export type ApprovalMode = "never" | "on-request" | "on-failure" | "untrusted";
 
 export type SandboxMode = "read-only" | "workspace-write" | "danger-full-access";
 
-export type ModelReasoningEffort = "minimal" | "low" | "medium" | "high" | "xhigh";
+export type ModelReasoningEffort =
+  | "minimal"
+  | "low"
+  | "medium"
+  | "high"
+  | "xhigh"
+  | "max"
+  | "ultra";
 
 export type WebSearchMode = "disabled" | "cached" | "live";