Zero Trust Access Control with Vault AppRole and Machine Identity

Act as a Machine Identity Architect. Engineer a highly secure, automated 'Secret Zero' introduction and authentication workflow leveraging the HashiCorp Vault AppRole auth method specifically designed for autonomous machine identities. The target environment is a chaotic [RUNTIME_ENVIRONMENT] (e.g., ephemeral EC2 instances or Docker Swarm) with all deployments ruthlessly managed by a [CI_CD_PLATFORM] (e.g., GitLab CI or Jenkins). You must provide a deeply technical explanation demonstrating how to utilize strict CIDR block binding and Vault's cryptographic 'Response Wrapping' (Cubbyhole) mechanism to securely deliver the highly sensitive `RoleID` and `SecretID` across untrusted networks. Define an uncompromising, highly granular [POLICY_STRICTNESS] HCL policy that restricts the resulting Vault token's access based entirely on environment metadata and tight temporal constraints (e.g., token expires in 60 seconds).