fix(scanner): avoid out-of-bounds read of valid_symbols during error recovery - #258

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v4, actions/setup-go@v5, actions/setup-python@v5, tree-sitter/parse-action@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

examples/nu_scripts/stdlib-candidate-archive/std-rfc/aggregate/mod.nu Parse: 1.11 ms 3359 bytes/ms