First cut

scripts/check-canonical.js

@@ -0,0 +1,41 @@
+#!/usr/bin/env node
+import fs from 'fs';
+import path from 'path';
+import { fileURLToPath } from 'url';
+
+const __dirname = path.dirname(fileURLToPath(import.meta.url));
+const root = path.resolve(__dirname, '..');
+
+const { stringifyCanonical } = await import(path.join(root, 'shared/src/canonical-json.ts'));
+
+const files = [
+  'site-context.json',
+  'content/events.json',
+  'config/sms-sites.json',
+  ...fs.readdirSync(path.join(root, 'content/sections'))
+    .filter(f => f.endsWith('.json'))
+    .map(f => `content/sections/${f}`),
+];
+
+const errors = [];
+console.log('Checking canonical JSON format...');
+
+for (const rel of files) {
+  const abs = path.join(root, rel);
+  const raw = fs.readFileSync(abs, 'utf-8');
+  const parsed = JSON.parse(raw);
+  const canonical = stringifyCanonical(parsed);
+  if (raw === canonical) {
+    console.log(`  ✓ ${rel}`);
+  } else {
+    errors.push(rel);
+  }
+}
+
+if (errors.length > 0) {
+  console.error('\n✗ Non-canonical files (run `node scripts/canonicalize.js` to fix):');
+  errors.forEach(e => console.error(`  ${e}`));
+  process.exit(1);
+} else {
+  console.log('\n✓ All files are canonical.');
+}