fix(opencode): switch session models without restart

electron/opencode/client.ts

@@ -271,6 +271,16 @@ export function createOpencodeClient(options: OpencodeClientOptions) {
         body: JSON.stringify(payload),
         signal: options?.signal,
       }),
+    switchSessionModel: (
+      sessionID: string,
+      model: OpencodeModelReference,
+      options?: OpencodeRuntimeRequestOptions,
+    ): Promise<void> =>
+      request<void>(`/api/session/${encodeURIComponent(sessionID)}/model`, {
+        method: 'POST',
+        body: JSON.stringify({ model }),
+        signal: options?.signal,
+      }),
     executeSessionCommand: (
       sessionID: string,
       payload: ExecuteOpencodeSessionCommandInput,