use list-dir instead of list-files. move function related functions to the center

templates/center/delete-function.mjs

@@ -0,0 +1,26 @@
+import fs from 'node:fs';
+import path from 'node:path';
+
+export const spec = {
+  name: 'delete-function',
+  description: 'Delete a function module from this remote.',
+  parameters: {
+    type: 'object',
+    properties: {
+      name: { type: 'string', description: 'Name of the function to delete.' },
+    },
+    required: ['name'],
+  },
+};
+
+export default async function (args, ctx) {
+  const functionsDir = path.join(ctx.dir, '.remote', 'functions');
+  for (const ext of ['.mjs', '.js']) {
+    const file = path.join(functionsDir, `${args.name}${ext}`);
+    if (fs.existsSync(file)) {
+      fs.unlinkSync(file);
+      return { deleted: args.name };
+    }
+  }
+  throw new Error(`No such function: ${args.name}`);
+}