chore: align CI to hardened canon, add AGENTS.md + CLAUDE.md

CI: drop accept-flake-config (supply-chain risk; caches already pinned),
run luacheck with --std lua51 --no-unused-args (matches the Lua 5.1 target
and the curried-FFI idiom), invoke the test step via bash so it no longer
needs the execute bit.

AGENTS.md is the single instruction file the coding agents read natively;
CLAUDE.md is a one-line @AGENTS.md import so Claude Code shares it. Also
removes dead JavaScript-era package files. Tooling and docs only, no src/.

Author: Unisay

.eslintrc.json

@@ -14,15 +14,14 @@ jobs:
       - uses: cachix/install-nix-action@v27
         with:
           extra_nix_config: |
-            accept-flake-config = true
             extra-substituters = https://cache.iog.io https://purescript-lua.cachix.org
             extra-trusted-public-keys = hydra.iohk.io:f/Ea+s+dFdN+3Y/G+FDgSq+a5NEWhJGzdjvKNGv0/EQ= purescript-lua.cachix.org-1:yLs4ei2HtnuPtzLekOrW3xdfm95+Etw15gwgyIGTayA=
 
       - name: Build
         run: nix develop -c ./scripts/build
 
       - name: Test
-        run: if [ -f scripts/test ]; then nix develop -c ./scripts/test; fi
+        run: if [ -f scripts/test ]; then nix develop -c bash ./scripts/test; fi
 
       - name: Luacheck
-        run: nix develop -c luacheck --quiet --std min src/
+        run: nix develop -c luacheck --quiet --std lua51 --no-unused-args src/

.github/workflows/ci.yml

@@ -1,8 +1,4 @@
 /.*
 !/.gitignore
-!/.eslintrc.json
 !/.github/
-/bower_components/
-/node_modules/
 /output/
-package-lock.json

.gitignore

@@ -0,0 +1,45 @@
+# AGENTS.md
+
+A PureScript→Lua FFI fork in the [`purescript-lua`](https://github.com/Unisay/purescript-lua) package set. Generated code targets **Lua 5.1**.
+
+## Commands
+
+All commands run inside the nix dev shell:
+
+- Build: `nix develop -c ./scripts/build`
+- Test (only if the fork has `scripts/test`): `nix develop -c bash ./scripts/test`
+- Lint: `nix develop -c luacheck --quiet --std lua51 --no-unused-args src/`
+
+## Lua 5.1 target
+
+The output runs on Lua 5.1, which is stricter than 5.3:
+
+- No `table.unpack`, `bit32`, `utf8`, or the `//` operator. `math.pow` and `math.atan2` do exist.
+- Array-style tables are 1-indexed: the first element is `t[1]`, not `t[0]`.
+- `unit` is `{}`, never `nil`: a `nil` table element silently disappears, which would collapse `Array Unit` into an empty table.
+- Lua 5.1 mangles some Lua 5.3 string escapes, so keep FFI string escapes 5.1-safe.
+
+## FFI files (under `src/`)
+
+pslua's foreign-file parser needs every exported value wrapped in parentheses:
+
+```lua
+return {
+  identity = (function(x) return x end),
+  answer = (42),
+}
+```
+
+A bare `function … end` or an unparenthesised expression fails to parse.
+
+## Toolchain
+
+`flake.nix` pins everything through [`purescript-overlay`](https://github.com/thomashoneyman/purescript-overlay): purs 0.15.16 (`purs-bin.purs-0_15_16`), spago 0.21.0 (`spago-bin.spago-0_21_0`), Lua 5.1 (`lua51Packages`). The `pslua` input tracks `github:Unisay/purescript-lua`; keep `flake.lock` reasonably current, since a long-stale pslua pin won't create the `--lua-output-file` directory and CI fails.
+
+## Releasing
+
+Tag-driven, with no GitHub Release or changelog entry. The full conventions live in the [package-set repo](https://github.com/Unisay/purescript-lua-package-sets/blob/master/CONTRIBUTING.md): push an annotated tag on `master`, bump this fork's `version` in the package set's `src/packages.dhall`, refresh `latest-compatible-sets.json`, and push a `psc-*` set tag.
+
+## Decisions
+
+Cross-cutting decisions are recorded as ADRs in the [package-set repo](https://github.com/Unisay/purescript-lua-package-sets/tree/master/docs/adr). Read them before a decision that affects the set, and add one after making such a decision.

AGENTS.md

@@ -0,0 +1 @@
+@AGENTS.md