P1: TypeScript types broken - .db property not visible

[brainkim]

Problem

TypeScript cannot see the .db property on Zod schemas:

import { z, table } from "@b9g/zen";

const Users = table("users", {
  id: z.string().db.primary(),  // TS2339: Property 'db' does not exist on type 'ZodString'
});

Runtime works fine because extendZod(z) adds the property dynamically.

Root Cause

The build tool (libuild) is not correctly handling:

1. .d.ts file paths - references ./impl/table.js which doesn't exist in published package
2. Module augmentations - declare module "zod" is missing from output

Upstream issue: bikeshaving/libuild#1

Workaround

None currently. Users must use // @ts-ignore or as any casts.

Priority

P1 - Core TypeScript functionality is broken.