fix(deps): drop conflicting utf-8-validate/bufferutil optionalDependencies

The optionalDependencies pinned utf-8-validate ^6.0.3, but ws@8 only
accepts ^5.0.2 as its optional peer and ibm-watson's websocket dep
hard-requires ^5.0.2. That 5.x-vs-6.x split forced a dual-version tree
that npm 10 and npm 11 lay out differently, so a lockfile generated with
npm 11 (local) failed 'npm ci' under npm 10 (CI, node 20) with
'Missing: utf-8-validate@5.0.10 from lock file'. The 6.x pin never
accelerated ws anyway. Removing it collapses to a single utf-8-validate
5.0.10 that both npm majors resolve identically.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

package-lock.json

@@ -59,10 +59,6 @@
       },
       "engines": {
         "node": ">= 20.x"
-      },
-      "optionalDependencies": {
-        "bufferutil": "^4.0.8",
-        "utf-8-validate": "^6.0.3"
       }
     },
     "node_modules/@aws-crypto/sha256-browser": {
@@ -10953,12 +10949,11 @@
       }
     },
     "node_modules/utf-8-validate": {
-      "version": "6.0.6",
-      "resolved": "https://registry.npmjs.org/utf-8-validate/-/utf-8-validate-6.0.6.tgz",
-      "integrity": "sha512-q3l3P9UtEEiAHcsgsqTgf9PPjctrDWoIXW3NpOHFdRDbLvu4DLIcxHangJ4RLrWkBcKjmcs/6NkerI8T/rE4LA==",
+      "version": "5.0.10",
+      "resolved": "https://registry.npmjs.org/utf-8-validate/-/utf-8-validate-5.0.10.tgz",
+      "integrity": "sha512-Z6czzLq4u8fPOyx7TU6X3dvUZVvoJmxSQ+IcrlmagKhilxlhZgxPK6C5Jqbkw1IDUmFTM+cz9QDnnLTwDz/2gQ==",
       "hasInstallScript": true,
       "license": "MIT",
-      "optional": true,
       "dependencies": {
         "node-gyp-build": "^4.3.0"
       },
@@ -11101,19 +11096,6 @@
       "integrity": "sha512-Tpp60P6IUJDTuOq/5Z8cdskzJujfwqfOTkrwIwj7IRISpnkJnT6SyJ4PCPnGMoFjC9ddhal5KVIYtAt97ix05A==",
       "license": "MIT"
     },
-    "node_modules/websocket/node_modules/utf-8-validate": {
-      "version": "5.0.10",
-      "resolved": "https://registry.npmjs.org/utf-8-validate/-/utf-8-validate-5.0.10.tgz",
-      "integrity": "sha512-Z6czzLq4u8fPOyx7TU6X3dvUZVvoJmxSQ+IcrlmagKhilxlhZgxPK6C5Jqbkw1IDUmFTM+cz9QDnnLTwDz/2gQ==",
-      "hasInstallScript": true,
-      "license": "MIT",
-      "dependencies": {
-        "node-gyp-build": "^4.3.0"
-      },
-      "engines": {
-        "node": ">=6.14.2"
-      }
-    },
     "node_modules/whatwg-url": {
       "version": "5.0.0",
       "resolved": "https://registry.npmjs.org/whatwg-url/-/whatwg-url-5.0.0.tgz",

package.json

@@ -72,9 +72,5 @@
     "nyc": "^15.1.0",
     "proxyquire": "^2.1.3",
     "tape": "^5.7.5"
-  },
-  "optionalDependencies": {
-    "bufferutil": "^4.0.8",
-    "utf-8-validate": "^6.0.3"
   }
 }