feat(regression): skill scaffold + resolveBinary/buildHeader/parseExit

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.claude/skills/regression/run.mjs

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+#!/usr/bin/env node
+// .claude/skills/regression/run.mjs
+// Regression sweep orchestrator for the /regression skill.
+// Design: docs/superpowers/specs/2026-05-16-regression-skill-design.md
+import process from 'node:process';
+
+// ── pure: platform binary resolution ───────────────────────────────
+export function resolveBinary(name, platform = process.platform) {
+  return platform === 'win32' ? `bin\\${name}.exe` : name;
+}
+
+// ── pure: output header line ───────────────────────────────────────
+export function buildHeader(tier) {
+  const head = `─ /regression ${tier} `;
+  return head + '─'.repeat(Math.max(3, 48 - head.length));
+}
+
+// ── pure: exit-code token ──────────────────────────────────────────
+export function parseExit(label, code) {
+  return `${label} ${code}`;
+}

.claude/skills/regression/run.test.mjs

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+import test from 'node:test';
+import assert from 'node:assert/strict';
+import {
+  resolveBinary, buildHeader, parseExit,
+} from './run.mjs';
+
+test('resolveBinary: win32 → bin\\<name>.exe', () => {
+  assert.equal(resolveBinary('gitleaks', 'win32'), 'bin\\gitleaks.exe');
+});
+test('resolveBinary: non-win32 → bare name on PATH', () => {
+  assert.equal(resolveBinary('lychee', 'linux'), 'lychee');
+  assert.equal(resolveBinary('lychee', 'darwin'), 'lychee');
+});
+
+test('buildHeader: starts with the tier banner', () => {
+  assert.ok(buildHeader('quick').startsWith('─ /regression quick '));
+  assert.ok(buildHeader('full').startsWith('─ /regression full '));
+});
+test('buildHeader: is padded with dashes', () => {
+  assert.ok(buildHeader('full').length >= 30);
+});
+
+test('parseExit: builds "<label> <code>" token', () => {
+  assert.equal(parseExit('Pint', 0), 'Pint 0');
+  assert.equal(parseExit('ESLint', 1), 'ESLint 1');
+});