feat(07-unified-service-catalog): add net-new services informational check to validation script

- Check 6: Count of services with migrated_from IS NULL (net-new rows created via /admin/catalog after migration)
- Printed as informational line at the end of validation output
- Does not fail validation if count is zero (expected for fresh test runs)

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

scripts/validate-services-migration.ts

@@ -99,6 +99,13 @@ async function validate() {
     console.log("PASS: no duplicate names in services");
   }
 
+  // Check 6: informational — count of net-new (non-migrated) services
+  const [netNew] = await db
+    .select({ n: sql<number>`count(*)::int` })
+    .from(services)
+    .where(sql`migrated_from IS NULL`);
+  console.log(`INFO: ${netNew.n} net-new services created post-migration (migrated_from IS NULL)`);
+
   console.log(`\n${failures === 0 ? "ALL CHECKS PASSED" : `${failures} CHECK(S) FAILED`}`);
   process.exit(failures === 0 ? 0 : 1);
 }