refactor(commands): split CLI commands

src/commands/auth-choice.apply.github-copilot.ts

@@ -0,0 +1,71 @@
+import { githubCopilotLoginCommand } from "../providers/github-copilot-auth.js";
+import type {
+  ApplyAuthChoiceParams,
+  ApplyAuthChoiceResult,
+} from "./auth-choice.apply.js";
+import { applyAuthProfileConfig } from "./onboard-auth.js";
+
+export async function applyAuthChoiceGitHubCopilot(
+  params: ApplyAuthChoiceParams,
+): Promise<ApplyAuthChoiceResult | null> {
+  if (params.authChoice !== "github-copilot") return null;
+
+  let nextConfig = params.config;
+
+  await params.prompter.note(
+    [
+      "This will open a GitHub device login to authorize Copilot.",
+      "Requires an active GitHub Copilot subscription.",
+    ].join("\n"),
+    "GitHub Copilot",
+  );
+
+  if (!process.stdin.isTTY) {
+    await params.prompter.note(
+      "GitHub Copilot login requires an interactive TTY.",
+      "GitHub Copilot",
+    );
+    return { config: nextConfig };
+  }
+
+  try {
+    await githubCopilotLoginCommand({ yes: true }, params.runtime);
+  } catch (err) {
+    await params.prompter.note(
+      `GitHub Copilot login failed: ${String(err)}`,
+      "GitHub Copilot",
+    );
+    return { config: nextConfig };
+  }
+
+  nextConfig = applyAuthProfileConfig(nextConfig, {
+    profileId: "github-copilot:github",
+    provider: "github-copilot",
+    mode: "token",
+  });
+
+  if (params.setDefaultModel) {
+    const model = "github-copilot/gpt-4o";
+    nextConfig = {
+      ...nextConfig,
+      agents: {
+        ...nextConfig.agents,
+        defaults: {
+          ...nextConfig.agents?.defaults,
+          model: {
+            ...(typeof nextConfig.agents?.defaults?.model === "object"
+              ? nextConfig.agents.defaults.model
+              : undefined),
+            primary: model,
+          },
+        },
+      },
+    };
+    await params.prompter.note(
+      `Default model set to ${model}`,
+      "Model configured",
+    );
+  }
+
+  return { config: nextConfig };
+}