feat: add app-owned Copilot and Grok subscription connections

src/agent/subscription-connections.ts

@@ -0,0 +1,23 @@
+import { chatGPTBackgroundAllowed, chatGPTConnected, chatGPTScopeCurrent, onChatGPTChange } from "./chatgpt-bridge.ts";
+import { nativeSubscriptionId, nativeSubscriptionConnected, nativeSubscriptionBackgroundAllowed, nativeAdmissionCurrent, onNativeSubscriptionChange } from "./subscription-bridge.ts";
+import type { AdmissionScope } from "./subscription-request-cycle.ts";
+
+export function isSubscriptionProvider(provider: string | undefined): boolean { return provider === "chatgpt" || !!(provider && nativeSubscriptionId(provider)); }
+export function subscriptionConnected(provider: string): boolean {
+	if (provider === "chatgpt") return chatGPTConnected();
+	const native = nativeSubscriptionId(provider); return !!native && nativeSubscriptionConnected(native);
+}
+/** Ordinary API connections have no subscription background-consent gate. */
+export function connectionBackgroundAllowed(provider: string | undefined): boolean {
+	if (provider === "chatgpt") return chatGPTBackgroundAllowed();
+	const native = provider ? nativeSubscriptionId(provider) : undefined;
+	return native ? nativeSubscriptionBackgroundAllowed(native) : true;
+}
+export function connectionScopeCurrent(provider: string, scope: AdmissionScope): boolean {
+	if (provider === "chatgpt") return chatGPTScopeCurrent(scope);
+	const native = nativeSubscriptionId(provider); return !!native && nativeAdmissionCurrent(native, scope);
+}
+export function onSubscriptionChange(listener: () => void): () => void {
+	const stopChatGPT = onChatGPTChange(listener), stopNative = onNativeSubscriptionChange(listener);
+	return () => { stopChatGPT(); stopNative(); };
+}