pnpm --filter takes the package name, not the directory

In a pnpm workspace, pnpm --filter matches the name field in a package's package.json, not the folder it lives in.

In this repo the blog lives in apps/blog, but its package is called blog:

pnpm --filter blog dev

pnpm --filter apps/blog dev matches nothing and quietly does nothing, which is easy to mistake for a hung dev server.