feat(shared): add Lua to SupportedLanguages enum

Add Lua enum member, .lua extension mapping, 'lua' Prism syntax
identifier, and 'experimental' classification for RFC §6.1 governance.

gitnexus-shared/src/language-detection.ts

@@ -41,6 +41,7 @@ const EXTENSION_MAP: Record<SupportedLanguages, readonly string[]> = {
   [SupportedLanguages.Kotlin]: ['.kt', '.kts'],
   [SupportedLanguages.Swift]: ['.swift'],
   [SupportedLanguages.Dart]: ['.dart'],
+  [SupportedLanguages.Lua]: ['.lua'],
   [SupportedLanguages.Vue]: ['.vue'],
   [SupportedLanguages.Cobol]: ['.cbl', '.cob', '.cpy', '.cobol'],
 } satisfies Record<SupportedLanguages, readonly string[]>; // Ensure exhaustiveness
@@ -99,6 +100,7 @@ const SYNTAX_MAP: Record<SupportedLanguages, string> = {
   [SupportedLanguages.Kotlin]: 'kotlin',
   [SupportedLanguages.Swift]: 'swift',
   [SupportedLanguages.Dart]: 'dart',
+  [SupportedLanguages.Lua]: 'lua',
   [SupportedLanguages.Vue]: 'typescript',
   [SupportedLanguages.Cobol]: 'cobol',
 } satisfies Record<SupportedLanguages, string>; // Ensure exhaustiveness

gitnexus-shared/src/languages.ts

@@ -20,6 +20,7 @@ export enum SupportedLanguages {
   Swift = 'swift',
   Dart = 'dart',
   Vue = 'vue',
+  Lua = 'lua',
   /** Standalone regex processor — no tree-sitter, no LanguageProvider. */
   Cobol = 'cobol',
 }

gitnexus-shared/src/scope-resolution/language-classification.ts

@@ -39,6 +39,7 @@ export const LanguageClassifications: Readonly<Record<SupportedLanguages, Langua
     [SupportedLanguages.Kotlin]: 'production',
     [SupportedLanguages.Swift]: 'production',
     [SupportedLanguages.Dart]: 'production',
+    [SupportedLanguages.Lua]: 'experimental',
     [SupportedLanguages.Vue]: 'experimental',
     [SupportedLanguages.Cobol]: 'experimental',
   };