[EPIC 5.0] Keycard Advanced Features #8
Description
Problem
Advanced Keycard security and code quality beyond basic integration.
Success Criteria
- Security level tracking
- Secure channel abstraction
- Type-safe builder pattern
- Verified signing (double-take protocol)
Non-goals
Non-Keycard smart cards, NFC support
Timeline
Q1 2026 - Q2 2026
Dependencies
BLOCKED BY: Epic 1
Notes
Basic Keycard (logos-messaging#68, logos-messaging#70) in Epic 1. This covers advanced features.