Revert the capability set, and say what isolated mode bounds - #85

note: ‘*(unsigned int *)((char *)&gil + offsetof(loop_gil_t, gstate))’ was declared here

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-python@v5. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

‘*(unsigned int *)((char *)&gil + offsetof(loop_gil_t, gstate))’ may be used uninitialized [-Wmaybe-uninitialized]

‘__builtin_strncpy’ output may be truncated copying 127 bytes from a string of length 127 [-Wstringop-truncation]

‘__builtin_strncpy’ output may be truncated copying 127 bytes from a string of length 127 [-Wstringop-truncation]

‘EVENT_LOOP_CAPSULE_NAME’ defined but not used [-Wunused-variable]

‘EVENT_LOOP_ATTR_NAME’ defined but not used [-Wunused-variable]

‘ReactorBuffer_as_sequence’ defined but not used [-Wunused-variable]

ignoring return value of ‘write’ declared with attribute ‘warn_unused_result’ [-Wunused-result]