feat: scripts/run + README run instructions for the OpenResty demo

[Unisay]

Adds a way to actually run the compiled bindings, plus the docs to go with it.

The Lua.Ngx bindings wrap the ngx.* API that the lua-nginx-module injects, so they only work inside an OpenResty worker. Until now there was no way to exercise them short of hand writing an nginx config. This adds scripts/run, which generates a minimal config and serves the dist modules under OpenResty so you can curl them, mirroring how scripts/build produces them.

Changes:

• flake.nix: add openresty to the dev shell, so nix develop -c ./scripts/run has everything it needs, pinned by the flake like the rest of the toolchain.
• scripts/run: write a throwaway nginx.conf and serve dist/*.lua via dofile, with /say and /status locations. PORT= overrides the listen port. It fails fast with a clear message if openresty is not on PATH (the common case being a direnv shell that predates this change), pointing at nix develop -c ./scripts/run or direnv reload.
• README.md: document build, run, and how to consume a linked module from your own config (dofile by absolute path, curried Effect calling convention).
• .gitignore: ignore the direnv cache.

Verified locally: nix develop -c ./scripts/run serves on :8099, curl /say returns the greeting, and curl /status shows the HTTP_OK constant (200) with ngx.status set to 404.

[Copilot]

Pull request overview

Adds a first-class way to run and manually exercise the generated Lua.Ngx* Lua modules inside an OpenResty worker, along with documentation and Nix-shell support so contributors can curl a working demo without hand-writing an nginx config.

Changes:

• Add scripts/run to generate a temporary nginx.conf and serve dist/*.lua via OpenResty with /say and /status endpoints.
• Extend the dev shell (flake.nix) to include openresty so nix develop -c ./scripts/run works out of the box.
• Document build/run usage and embedding the linked dist/*.lua modules in your own nginx config; ignore .direnv/.

Reviewed changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated 3 comments.

File	Description
scripts/run	New demo runner that launches OpenResty with a generated nginx config to execute dist/Lua.Ngx*.lua via dofile.
README.md	Adds build/run instructions and explains how to load linked modules (literal-dot filenames) and call curried Effect thunks.
flake.nix	Adds openresty to the dev shell toolchain for running the demo.
.gitignore	Ignores .direnv/ artifacts.

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