- Move all application env vars to repository-root .env (with .env.example
as the committed template) and drop the per-app .env.example files.
- Add @code/env subpaths (agent, convex) and consume validated exports
everywhere instead of reading process.env directly.
- Wire every dev/build/start script to load ../../.env via bun --env-file
and point vite.config.ts envDir at the repo root.
