Introduce a tuned .luacheckrc and scripts/lint.sh so the engine has a
standing static-analysis baseline -- the tool that would have caught both
bugs in the previous commit before they shipped.
The config is high-signal by design: it keeps the categories that catch
real defects (undefined globals/locals, unused values, unreachable code)
and mutes the cosmetic ones the codebase deliberately lives with (a self/dt
an interface requires but a method ignores, documented empty fall-through
branches, long lines). It marks `love` mutable (games assign callbacks onto
it) and teaches it LuaJIT's table.unpack.
.luacheckrc is tracked via a .gitignore exception, matching how .github and
.gitignore opt out of the blanket dotfile ignore.
`luacheck src` now reports 7 benign warnings and 0 errors, down from 185.
Also drop one dead `require` (ItemEffects loaded src.pokemon.Pokemon and
never used it).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Q6bFAiQyZ5jDmewsbB4LG9
Claude