feat: add Lua and Luau language support (#273)

Adds Lua (.lua) and Luau (.luau) extraction — functions, methods with receivers, type aliases (Luau), require imports (incl. Roblox instance-path), and call edges. Vendors the ABI-15 Lua and ABI-14 Luau tree-sitter grammars. Addresses #232.

src/extraction/languages/index.ts

@@ -23,6 +23,8 @@ import { kotlinExtractor } from './kotlin';
 import { dartExtractor } from './dart';
 import { pascalExtractor } from './pascal';
 import { scalaExtractor } from './scala';
+import { luaExtractor } from './lua';
+import { luauExtractor } from './luau';
 
 export const EXTRACTORS: Partial<Record<Language, LanguageExtractor>> = {
   typescript: typescriptExtractor,
@@ -43,4 +45,6 @@ export const EXTRACTORS: Partial<Record<Language, LanguageExtractor>> = {
   dart: dartExtractor,
   pascal: pascalExtractor,
   scala: scalaExtractor,
+  lua: luaExtractor,
+  luau: luauExtractor,
 };