ci: add Lua lint gate with luacheck

[membphis]

Summary

• Add a LuaJIT/busted-aware .luacheckrc for lua/ and tests/lua/.
• Add make lua-lint as the local luacheck entrypoint and list it in make help.
• Add a CI Lua lint job that installs luacheck and runs make lua-lint.
• Clean up the small existing Lua warnings surfaced by luacheck.

Closes #98.

Test Plan

• PATH="/tmp/qjson-luacheck-luajit/bin:$PATH" make lua-lint
• make lint
• PATH="/tmp/qjson-luacheck-luajit/bin:$PATH" make test LUA_CPATH='./target/release/lib?.dylib;/tmp/qjson-luacheck-luajit/lib/lua/5.1/?.so;./vendor/lua-cjson/?.so;./target/release/lib?.so;./?.so;/usr/local/openresty/lualib/?.so;/usr/local/lib/lua/5.1/?.so;/usr/local/openresty/luajit/lib/lua/5.1/?.so'
• cargo test --release --no-default-features
• cargo test --features test-panic --release

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: c5080be5-4cc1-49f0-bc85-ac23f96840e6

📥 Commits

Reviewing files that changed from the base of the PR and between 3cc1d32 and 857f9ec.

📒 Files selected for processing (6)

• .github/workflows/ci.yml
• .luacheckrc
• Makefile
• lua/qjson/table.lua
• tests/lua/gc_spec.lua
• tests/lua/lazy_table_spec.lua

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/issue-98-luacheck

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