sdlc-gcs-storage

Implement Cloud Storage with private buckets, uniform bucket-level access, and V4 signed URLs. Use when creating buckets, generating signed URLs, configuring lifecycle rules, or reviewing storage code. Triggers on Cloud Storage, GCS, bucket, signed URL, or object storage requests. Buckets are always private with uniform bucket-level access — access only via short-lived signed URLs, never public reads or legacy ACLs.