fix: update nostr-crypto-utils to use NPM package

- Replace local file dependency with NPM package version
- Update to version 0.6.4
- Use nostr-crypto-utils ^0.4.10 from NPM registry
- Ensure compatibility with published package

.gitignore

@@ -24,4 +24,3 @@ coverage/
 .env.*.local
 
 # Project specific
-CHECKLIST.md

package.json

@@ -1,6 +1,6 @@
 {
   "name": "nostr-nsec-seedphrase",
-  "version": "0.6.3",
+  "version": "0.6.4",
   "description": "A comprehensive TypeScript library for Nostr key management with BIP39 seed phrases, supporting both ESM and CommonJS. Implements NIP-01, NIP-06, NIP-19, and NIP-26 with key generation, event signing, bech32 encoding/decoding, and secure cryptographic operations.",
   "type": "module",
   "main": "./dist/index.js",
@@ -59,7 +59,7 @@
     "@scure/base": "^1.2.1",
     "bech32": "^2.0.0",
     "bip39": "^3.1.0",
-    "nostr-crypto-utils": "file:../nostr-crypto-utils",
+    "nostr-crypto-utils": "^0.4.10",
     "pino": "^8.17.2"
   },
   "devDependencies": {