refactor(launcher): split CLI flow into command modules

Isolate process-side effects behind adapter seams and keep wrapper behavior stable while improving command-level testability.

launcher/commands/config-command.ts

@@ -0,0 +1,43 @@
+import fs from 'node:fs';
+import { fail } from '../log.js';
+import { resolveMainConfigPath } from '../config-path.js';
+import type { LauncherCommandContext } from './context.js';
+
+interface ConfigCommandDeps {
+  existsSync(path: string): boolean;
+  readFileSync(path: string, encoding: BufferEncoding): string;
+  resolveMainConfigPath(): string;
+}
+
+const defaultDeps: ConfigCommandDeps = {
+  existsSync: fs.existsSync,
+  readFileSync: fs.readFileSync,
+  resolveMainConfigPath,
+};
+
+export function runConfigCommand(
+  context: LauncherCommandContext,
+  deps: ConfigCommandDeps = defaultDeps,
+): boolean {
+  const { args, processAdapter } = context;
+  if (args.configPath) {
+    processAdapter.writeStdout(`${deps.resolveMainConfigPath()}\n`);
+    return true;
+  }
+
+  if (!args.configShow) {
+    return false;
+  }
+
+  const configPath = deps.resolveMainConfigPath();
+  if (!deps.existsSync(configPath)) {
+    fail(`Config file not found: ${configPath}`);
+  }
+
+  const contents = deps.readFileSync(configPath, 'utf8');
+  processAdapter.writeStdout(contents);
+  if (!contents.endsWith('\n')) {
+    processAdapter.writeStdout('\n');
+  }
+  return true;
+}