fix(ai): route GitHub Copilot MAI-Code models through /responses endpoint (#6544)

mai-code-1-flash-picker is not accessible via /chat/completions and
must use the Copilot /responses endpoint. Update generate-models.ts to
send mai-* models to the responses API and regenerate the affected
model entry.

packages/ai/src/providers/github-copilot.models.ts

@@ -468,11 +468,10 @@ export const GITHUB_COPILOT_MODELS = {
 	"mai-code-1-flash-picker": {
 		id: "mai-code-1-flash-picker",
 		name: "MAI-Code-1-Flash",
-		api: "openai-completions",
+		api: "openai-responses",
 		provider: "github-copilot",
 		baseUrl: "https://api.individual.githubcopilot.com",
 		headers: {"User-Agent":"GitHubCopilotChat/0.35.0","Editor-Version":"vscode/1.107.0","Editor-Plugin-Version":"copilot-chat/0.35.0","Copilot-Integration-Id":"vscode-chat"},
-		compat: {"supportsStore":false,"supportsDeveloperRole":false,"supportsReasoningEffort":false},
 		reasoning: true,
 		input: ["text"],
 		cost: {
@@ -483,5 +482,5 @@ export const GITHUB_COPILOT_MODELS = {
 		},
 		contextWindow: 256000,
 		maxTokens: 128000,
-	} satisfies Model<"openai-completions">,
+	} satisfies Model<"openai-responses">,
 } as const;