Feature Implementation: PIN#308

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antotocar34 wants to merge 8 commits intodoy:mainfrom

antotocar34:pin

Commits on Dec 24, 2025

Add cryptographic primitives for PIN unlock using Argon2id and XChaCha20-Poly1305.
antotocar34
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Add backend abstraction layer with PinBackend trait and configuration types.
antotocar34
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Implement age backend supporting plugin-based identities (yubikey, tpm, se).
antotocar34
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Implement OS keyring backend using native platform keychains.
antotocar34
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Add PIN flow orchestration (register, unlock, clear, status).
antotocar34
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Add CLI commands for PIN management (set, clear, status).
antotocar34
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Implement PIN unlock in agent with automatic fallback to master password.
antotocar34
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Add PIN feature documentation to README.
antotocar34
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