v2 message format and upgrade to ai sdk v5 (#743)

Co-authored-by: GitHub Action <action@github.com>
Co-authored-by: Liang-Shih Lin <liangshihlin@proton.me>
Co-authored-by: Dominik Engelhardt <dominikengelhardt@ymail.com>
Co-authored-by: Jay V <air@live.ca>
Co-authored-by: adamdottv <2363879+adamdottv@users.noreply.github.com>

packages/opencode/src/auth/github-copilot.ts

@@ -122,10 +122,7 @@ export namespace AuthGithubCopilot {
     return tokenData.token
   }
 
-  export const DeviceCodeError = NamedError.create(
-    "DeviceCodeError",
-    z.object({}),
-  )
+  export const DeviceCodeError = NamedError.create("DeviceCodeError", z.object({}))
 
   export const TokenExchangeError = NamedError.create(
     "TokenExchangeError",