Add PostCSS configuration and skills lock file

- Created a new PostCSS configuration file to integrate Tailwind CSS.
- Added a skills lock file containing various Expo skills with their respective source and computed hashes.

.agents/skills/expo-cicd-workflows/scripts/validate.js

@@ -0,0 +1,84 @@
+#!/usr/bin/env node
+
+import { readFile } from 'node:fs/promises';
+import { resolve } from 'node:path';
+import process from 'node:process';
+
+import Ajv2020 from 'ajv/dist/2020.js';
+import addFormats from 'ajv-formats';
+import yaml from 'js-yaml';
+
+import { fetchCached } from './fetch.js';
+
+const SCHEMA_URL = 'https://api.expo.dev/v2/workflows/schema';
+
+async function fetchSchema() {
+  const data = await fetchCached(SCHEMA_URL);
+  const body = JSON.parse(data);
+  return body.data;
+}
+
+function createValidator(schema) {
+  const ajv = new Ajv2020({ allErrors: true, strict: true });
+  addFormats(ajv);
+  return ajv.compile(schema);
+}
+
+async function validateFile(validator, filePath) {
+  const content = await readFile(filePath, 'utf-8');
+
+  let doc;
+  try {
+    doc = yaml.load(content);
+  } catch (e) {
+    return { valid: false, error: `YAML parse error: ${e.message}` };
+  }
+
+  const valid = validator(doc);
+  if (!valid) {
+    return { valid: false, error: formatErrors(validator.errors) };
+  }
+
+  return { valid: true };
+}
+
+function formatErrors(errors) {
+  return errors
+    .map((error) => {
+      const path = error.instancePath || '(root)';
+      const allowed = error.params?.allowedValues?.join(', ');
+      return `  ${path}: ${error.message}${allowed ? ` (allowed: ${allowed})` : ''}`;
+    })
+    .join('\n');
+}
+
+if (import.meta.main) {
+  const args = process.argv.slice(2);
+  const files = args.filter((a) => !a.startsWith('-'));
+
+  if (files.length === 0 || args.includes('--help') || args.includes('-h')) {
+    console.log(`Usage: validate <workflow.yml> [workflow2.yml ...]
+
+Validates EAS workflow YAML files against the official schema.`);
+    process.exit(files.length === 0 ? 1 : 0);
+  }
+
+  const schema = await fetchSchema();
+  const validator = createValidator(schema);
+
+  let hasErrors = false;
+
+  for (const file of files) {
+    const filePath = resolve(process.cwd(), file);
+    const result = await validateFile(validator, filePath);
+
+    if (result.valid) {
+      console.log(`✓ ${file}`);
+    } else {
+      console.error(`✗ ${file}\n${result.error}`);
+      hasErrors = true;
+    }
+  }
+
+  process.exit(hasErrors ? 1 : 0);
+}