chore: add clean-cache command

TICKET: WP-6096

Author: zahin-mohammad

CLAUDE.md

@@ -66,7 +66,7 @@ yarn unit-test
 # - Cache hit: "[existing outputs match the cache, left as is]"
 
 # Clear cache if needed
-rm -rf .nx/cache
+yarn clean-cache
 
 # Cache works with all test commands
 yarn unit-test --scope @bitgo/sdk-core  # Caches per package

package.json

@@ -128,6 +128,7 @@
     "check-fmt-changed": "lerna run check-fmt --since origin/${GITHUB_REPO_BRANCH:-master}..HEAD --stream --parallel",
     "check-fmt": "lerna run check-fmt --stream --parallel",
     "check-commits": "yarn commitlint --from=origin/${GITHUB_REPO_BRANCH:-master} -V",
+    "clean-cache": "npx nx reset",
     "check-deps": "tsx ./scripts/check-package-dependencies.ts",
     "check-versions": "node ./check-package-versions.js",
     "dev": "tsc -b ./tsconfig.packages.json -w",