Add generators: code, completion, and docs generators

src/generators/index.ts

@@ -0,0 +1,3 @@
+export { generateCode, getLanguageExtension, getOutputFileName, type GenerationResult } from './code-generator.js';
+export { generateCompletion, getCompletionFileName, getInstallInstructions, type CompletionResult } from './completion-generator.js';
+export { generateManPage, generateReadmeSection, getManPageFileName, getReadmeFileName, type DocsResult } from './docs-generator.js';