chore: import upstream snapshot with attribution

packages/api/scripts/copy-registry.mjs

@@ -0,0 +1,31 @@
+#!/usr/bin/env node
+/**
+ * Copy the generated plugin registry from `registry/` to `dist/registry/`
+ * so the published package's runtime loader (which resolves paths from
+ * `dist/`) can find it without depending on the `files` field layout.
+ *
+ * The `files: ["dist", "registry"]` array publishes both, so users can
+ * also resolve directly from the package root, but the dist/ copy is
+ * what the loader prefers (it's the path relative to __dirname).
+ */
+import { copyFileSync, mkdirSync, existsSync } from 'node:fs';
+import { dirname, join, resolve } from 'node:path';
+import { fileURLToPath } from 'node:url';
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = dirname(__filename);
+const PKG_ROOT = resolve(__dirname, '..');
+
+const src = join(PKG_ROOT, 'registry', 'plugins.generated.json');
+const destDir = join(PKG_ROOT, 'dist', 'registry');
+const dest = join(destDir, 'plugins.generated.json');
+
+if (!existsSync(src)) {
+  console.error('✗ copy-registry: source missing:', src);
+  console.error('  Run `node ../../scripts/build-plugin-registry.mjs` first.');
+  process.exit(1);
+}
+
+if (!existsSync(destDir)) mkdirSync(destDir, { recursive: true });
+copyFileSync(src, dest);
+console.log(`✓ Copied registry to ${dest}`);