test: add unresolved local import scanner

scripts/check-local-imports.ts

@@ -0,0 +1,12 @@
+import { findMissingLocalImports } from "../src/lib/local-imports";
+
+const missing = await findMissingLocalImports(process.cwd());
+
+if (missing.length === 0) {
+  console.log("No unresolved local imports.");
+  process.exit(0);
+}
+
+for (const item of missing) console.error(`${item.importer}: ${item.specifier}`);
+console.error(`${missing.length} unresolved local import(s).`);
+process.exitCode = 1;