The `time`/`timeLog`/`timeEnd` FFI stubs took a label parameter `s` but
never used it (the stub just errors), so luacheck flagged an unused
argument. Rename it to `_s` to mark it deliberately unused; the stubs
still fail loudly because Lua has no console-timer equivalent.

Also moves CI off the dead npm/bower/setup-purescript flow onto the nix
+ overlay canon used by the other package-set forks: `scripts/build`
under `set -euo pipefail`, luacheck `--std lua51 --no-unused-args`, and
drops the broken pulp/node `scripts/test`.

CI built on a 2024-03 pslua pin that wrote --lua-output-file without
creating the parent dir, so a fresh checkout failed with
`dist/Effect_Console.lua: withFile: does not exist`. Current pslua
ensures the output dir exists (the withOutputFile fix).

fix: stop ignoring timer labels with a named arg, move CI to nix (#64)

Move the dev shell off easy-purescript-nix onto the shared
purescript-overlay (purs 0.15.16, spago 0.21.0, lua51). Add AGENTS.md as
the single agent instruction file + CLAUDE.md @-import. Drop dead JS-era
files. Tooling and docs only.

chore: migrate flake to the purescript-overlay canon, add AGENTS.md

Repos moved from Unisay/* to the purescript-lua org. Update the pslua
flake input and lockfile owner (same rev 94c13ce), the packages.dhall
upstream-lua release URL, and the AGENTS.md links, so nothing relies on
the old-owner redirect.

chore: point pslua + package-set links at purescript-lua org

Wire treefmt via treefmt-nix: nixfmt, dhall format, purs-tidy (.tidyrc.json)
and LuaFormatter for the FFI (.lua-format, kept over StyLua because it
preserves the parentheses pslua's parser needs). `nix fmt` formats; the dev
shell installs a content-based pre-commit hook and CI runs
`nix fmt && git diff --exit-code` (content-based, since the in-place
formatters bump mtime and would trip treefmt --fail-on-change). Lua lines
budget 130 cols, matching the raised `luacheck --max-line-length`. The bulk
of the diff is the first format pass.

chore: add treefmt formatting (nix fmt + pre-commit + CI check)

Replace the dev-shell installer that wrote .git/hooks/pre-commit with a
tracked .githooks/pre-commit wired via `git config core.hooksPath .githooks`.

Fixes three issues with the old hook: it gated on `[ -d .git ]` (false in
worktrees/submodules where .git is a file), it clobbered any existing
.git/hooks/pre-commit on every `nix develop`, and `nix fmt … || exit 0`
swallowed real formatter failures. The new hook skips only when `nix` is
absent (CI is the authoritative gate) and otherwise blocks on a `nix fmt`
failure or reformat.

Toolchain consistency: pin the pslua dev flake input to the current
compiler main across the ecosystem. flake.lock only; the package set
consumes sources + FFI, not this dev input, so no re-tag is needed.

Upstream purescript-console maps `error` and `warn` to console.error /
console.warn, which target stderr in Node; the Lua FFI routed both through
`print` (stdout), erasing the only behavioral distinction they have from
`log` and breaking consumers that separate the streams. They now use
`io.stderr:write`. `log`/`info`/`debug` stay on stdout (correct — Node's
console.log/info/debug all target stdout).

Adds a Lua 5.1 regression guard (test/regression/console.lua) and a
scripts/test runner.

Fixes purescript-lua/purescript-lua#76
Fixes purescript-lua/purescript-lua#77

Build against the published purescript-lua package set via
workspace.packageSet.url instead of the old spago.dhall + packages.dhall
(upstream-ps // upstream-lua) merge. The new spago drives spago.yaml/spago.lock
and dropped Dhall.

- spago.dhall/packages.dhall -> spago.yaml (package name lua-console; the new
  spago rejects the purescript- prefix). backend.cmd "true" keeps codegen on
  corefn; the pslua invocation from spago.dhall's `backend` now lives in
  scripts/build, run over the emitted corefn as a plain step.
- flake.nix: spago 0.21.0 -> 1.x; drop the now-unused dhall dev-shell tool.
- treefmt.nix: drop the dead Dhall formatter. AGENTS.md: spago 1.x, src/packages.json.
- CI action versions bumped to current majors (checkout v5, install-nix v31).
- Remove the upstream PureScript test source test/Main.purs (never built: old
  sources globbed src/ only, and it carries JS FFI that doesn't target Lua). The
  Lua regression tests under test/regression stay.

…t.txt

treefmt.toml is dead config (nix fmt formats via treefmt.nix). The
expected_output.txt was an orphan from the old test setup; the kept
tests live under test/regression/.

Adds a CHANGELOG.md managed with scriv (fragments in changelog.d/), provides
scriv in the flake dev shell, and records the fork's Lua 5.1 FFI release line.
Where the upstream PureScript changelog existed it is preserved below the fork
section. The AGENTS.md Releasing note now points at the scriv flow instead of
"no changelog entry".

Part of the ecosystem-wide changelog adoption
(purescript-lua/purescript-lua#101); canon in package-set ADR 0009.