test: cut low-value tests, rewrite the rest around behavior, parallelize lanes (#285)

launcher/test-support/args.ts

@@ -0,0 +1,7 @@
+import { parseArgs } from '../config.js';
+import type { Args } from '../types.js';
+
+/** Default launcher `Args` (as if run with no CLI input), with `overrides` applied. */
+export function makeLauncherArgs(overrides: Partial<Args> = {}): Args {
+  return { ...parseArgs([], 'subminer', {}), ...overrides };
+}