test: establish WP5 continuous lineage gate

package.json

@@ -96,7 +96,8 @@
     "test:wp5-04": "node scripts/run-wp5-04-validation.mjs",
     "test:wp5-04:red": "node scripts/run-wp5-04-validation.mjs --phase red",
     "test:wp5-05": "node scripts/run-wp5-05-validation.mjs",
-    "test:wp5-05:red": "node scripts/run-wp5-05-validation.mjs --phase red"
+    "test:wp5-05:red": "node scripts/run-wp5-05-validation.mjs --phase red",
+    "test:wp5-lineage": "node scripts/run-wp5-lineage-validation.mjs"
   },
   "devDependencies": {
     "@playwright/test": "1.62.0",

scripts/run-wp5-lineage-validation.mjs

@@ -0,0 +1,59 @@
+import { execFileSync } from 'node:child_process';
+import fs from 'node:fs';
+import path from 'node:path';
+
+const tasks = [
+  ['TASK-WP5-03', 'origin/codex/wp5-03'],
+  ['TASK-WP5-04', 'origin/codex/wp5-04'],
+  ['TASK-WP5-05', 'origin/codex/wp5-05'],
+  ['TASK-WP5-06', 'origin/codex/wp5-06'],
+  ['TASK-WP5-07', 'origin/codex/wp5-07'],
+];
+
+function sha(ref) {
+  return execFileSync('git', ['rev-parse', ref], { encoding: 'utf8' }).trim();
+}
+
+function isAncestor(ref) {
+  try {
+    execFileSync('git', ['merge-base', '--is-ancestor', ref, 'HEAD'], { stdio: 'ignore' });
+    return true;
+  } catch {
+    return false;
+  }
+}
+
+function run(command, args) {
+  try {
+    const executable = process.platform === 'win32' && command === 'pnpm' ? 'pnpm.cmd' : command;
+    execFileSync(executable, args, { stdio: 'pipe', encoding: 'utf8', shell: process.platform === 'win32' });
+    return { status: 'passed' };
+  } catch (error) {
+    return { status: 'failed', exit_code: error.status ?? 1 };
+  }
+}
+
+const checks = tasks.map(([task, ref]) => ({ task, ref, sha: sha(ref), ancestor: isAncestor(ref) }));
+const regression = {
+  'TASK-WP5-06': run('pnpm', ['exec', 'vitest', 'run', 'tests/integration/wp5-06-sticker-cleanup.test.ts']),
+  'TASK-WP5-07': run('pnpm', ['exec', 'vitest', 'run', 'tests/api/wp5-07-preview-grants.test.ts']),
+};
+const status = checks.every((check) => check.ancestor)
+  && Object.values(regression).every((check) => check.status === 'passed')
+  ? 'ready_for_wp4_07'
+  : 'externally_blocked';
+
+const output = {
+  schema_version: '1.0',
+  task: 'TASK-WP5-LINEAGE',
+  status,
+  checks,
+  regression,
+  note: 'This gate proves ancestry and targeted regressions only; it does not replace per-task UI/resource evidence.',
+};
+const runId = `wp5-lineage-${new Date().toISOString().replace(/[^0-9]/g, '')}`;
+const outputDirectory = path.join('artifacts', 'tdd', runId);
+fs.mkdirSync(outputDirectory, { recursive: true });
+fs.writeFileSync(path.join(outputDirectory, 'lineage.json'), `${JSON.stringify(output, null, 2)}\n`, 'utf8');
+console.log(JSON.stringify(output));
+process.exitCode = status === 'ready_for_wp4_07' ? 0 : 3;

tests/package/wp5-lineage-validation.test.mjs

@@ -0,0 +1,10 @@
+import test from 'node:test';
+import assert from 'node:assert/strict';
+import { execFileSync } from 'node:child_process';
+
+test('WP5 lineage branch contains every required remote task tip', () => {
+  for (const task of ['wp5-03', 'wp5-04', 'wp5-05', 'wp5-06', 'wp5-07']) {
+    execFileSync('git', ['merge-base', '--is-ancestor', `origin/codex/${task}`, 'HEAD']);
+  }
+  assert.ok(true);
+});