refactor: split main runtime flows into focused modules

src/main/runtime/cli-command-prechecks.ts

@@ -0,0 +1,21 @@
+import type { CliArgs } from '../../cli/args';
+
+export function createHandleTexthookerOnlyModeTransitionHandler(deps: {
+  isTexthookerOnlyMode: () => boolean;
+  setTexthookerOnlyMode: (enabled: boolean) => void;
+  commandNeedsOverlayRuntime: (args: CliArgs) => boolean;
+  startBackgroundWarmups: () => void;
+  logInfo: (message: string) => void;
+}) {
+  return (args: CliArgs): void => {
+    if (
+      deps.isTexthookerOnlyMode() &&
+      !args.texthooker &&
+      (args.start || deps.commandNeedsOverlayRuntime(args))
+    ) {
+      deps.setTexthookerOnlyMode(false);
+      deps.logInfo('Disabling texthooker-only mode after overlay/start command.');
+      deps.startBackgroundWarmups();
+    }
+  };
+}