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feat: add technical specification for biometric note locking ($660 bounty #7) #83

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feat: add technical specification for biometric note locking ($660 bounty #7) #83

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14 changes: 14 additions & 0 deletions security/biometric-note-locking-tech-spec.md
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# Note Locking with Biometrics/PIN - Technical Specification

## Implementation Plan
1. Use OS-level biometric APIs (Windows Hello, macOS TouchID, Android Biometric)
2. PIN fallback with secure local storage
3. AES-256 encryption for note content
4. React Native or Flutter for cross-platform

## Security Considerations
- Keys stored in OS keychain/keystore
- Rate limiting on PIN attempts
- Auto-lock after inactivity

## Estimated Effort: 2-3 weeks