6/ZK-AGE-ELIGIBILITY: Add ZK-based Age Eligibility Verification spec

[cc03668]

Summary

• Adds spec 6/ZK-AGE-ELIGIBILITY: Wallet-Based Age Eligibility Verification for Third-Party Services
• Defines an OpenAC-based privacy-preserving age-eligibility verification protocol for wallet-based proof presentation to merchants
• MVP scope: Driver License credential for alcohol-purchase age gating (age >= 18 via accepted credential profile, no DOB disclosure)
• Covers the full prepare-reblind-show pipeline, device binding, verification sessions, merchant result model, circuit design (prepare/show relation split), and security considerations

Status

Raw specification, following 1/COSS.

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