GCS: Support Node/VM identity auth. - #33
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Without GOOGLE_APPLICATION_CREDENTIALS, mint the bearer token from the GCE/GKE metadata server (the VM's attached service account) instead of failing with "metadata-server auth not yet supported". This mirrors the S3 "no static keys -> EC2 IMDS" default, i.e. node identity. The key-file path is unchanged. Both sources share the token cache and response handling. The metadata client bypasses proxies and uses short timeouts, as the IMDS client does. GcsConfig is untouched, so there is no public API change; GCE_METADATA_HOST is not read. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Summary
Support Node/VM identity auth to GCS via metadata server.
Similarly to AWS activated when GOOGLE_APPLICATION_CREDENTIALS not provided.