When git hooks run, the shell profile is not sourced so nvm-managed
Node installations are not in PATH. This caused 'node: command not
found' errors on every commit for users relying on nvm.
Add a PATH-extension fallback in both pre-commit and run-node-tool.sh
that walks ~/.nvm/versions/node/*/bin/node and prepends the first
found binary to PATH, mirroring how nvm itself resolves the runtime.
