fix: remove lilypondDecoder from index exports

lilypondDecoder requires lotus which is optional. Remove it from main
exports to prevent TypeScript from compiling it during build.

Users who need lilypondDecoder can import it directly from:
  @k-l-lambda/lilylet/lib/lilypondDecoder.js

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: k-l-lambda

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@k-l-lambda/lilylet",
-  "version": "0.1.43",
+  "version": "0.1.44",
   "description": "Lilylet is a lilyopnd-like sheet music language designed for Markdown rendering and symbolic music representation in AIGC applications.",
   "type": "module",
   "main": "lib/index.js",

source/lilylet/index.ts

@@ -8,22 +8,12 @@ import * as musicXmlDecoder from "./musicXmlDecoder";
 import * as lilypondEncoder from "./lilypondEncoder";
 import * as musicXmlEncoder from "./musicXmlEncoder";
 
-// lilypondDecoder is optional - requires @k-l-lambda/lotus
-// Use dynamic import to avoid build-time dependency
-// @ts-ignore - lilypondDecoder.ts is excluded from build, pre-built .js is used
-const loadLilypondDecoder = async (): Promise<any> => {
-	try {
-		// eslint-disable-next-line @typescript-eslint/no-var-requires
-		return await import(/* webpackIgnore: true */ "./lilypondDecoder.js");
-	} catch {
-		return undefined;
-	}
-};
-
 export {
 	meiEncoder,
 	musicXmlDecoder,
 	lilypondEncoder,
 	musicXmlEncoder,
-	loadLilypondDecoder,
 };
+
+// Note: lilypondDecoder is optional and requires @k-l-lambda/lotus
+// Import it directly from '@k-l-lambda/lilylet/lib/lilypondDecoder.js' if needed