Add a Node.js CI workflow that builds and tests inside clusterio

The packages use workspace:^ and catalog: versions, so they only
resolve inside a clusterio checkout with this repository under
external_plugins. The workflow clones clusterio master, checks this
repository out into external_plugins/ExpCluster, runs pnpm install
(which runs every prepare script), then runs the tap suites.

A last step wipes dist and runs tsc --build in each package on its own.
pnpm install builds packages in dependency order, which is why the
missing project references fixed in #473 went unnoticed. On the tree
before #473 this step fails with the same five TS2307 errors.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

CONTRIBUTING.md

@@ -9,7 +9,7 @@ For developers wanting to add features please follow these guidelines:
 - Lua is checked with [emmylua](https://github.com/EmmyLuaLs/emmylua-analyzer-rust), configured by `.emmyrc.json`. Install the EmmyLua extension rather than sumnekolua / luals, and use factoriomod-debug to generate the factorio api types. Note that an inline cast must be written `--[[@as T]]`, the spaced form is not parsed.
 - Changes should be made on your own fork and merged into `main` through a pull request.
 - Each pull request should be limited to one feature or a few bug fixes and link to the related issue page.
-- Pull requests are automatically linted and documentation checked.
+- Pull requests are automatically linted, then built and tested against the latest clusterio `master`.
 - Pull requests are manually reviewed to maintain code and language quality.
 - New features should have the branch names: `feature/feature-name`
 - Bug fixes should have the branch names: `fix/bug-name`