Rewrite the encryption/persona/JWT docs to match the implemented code and
record the multi-person sharing design.
- multi-person-sharing.md (NEW): ADR for per-profile DEK + X25519 envelope
sharing. All five original open questions resolved 2026-07-18. Covers
divorced-parents, pets, graduation, and elderly-parent care; adds an
admin permission tier for owner-incapacity. Decided, not yet implemented.
(#3)
- encryption.md: full rewrite to the implemented wrapped-DEK / Web Crypto
model; the old version described ZK encryption as 'planned'. (#4)
- jwt-authentication-decision.md: rewritten to match implementation
(PBKDF2 not bcrypt, no Redis, token_version revocation, real Claims).
Original aspirational content preserved in a History section. (#4)
- PERSONA_AND_FAMILY_MANAGEMENT.md: 'Current reality' section added, old
'Implementation Status' marked superseded, encryption section corrected. (#4)
- ENCRYPTION_UPDATE_SUMMARY.md: archived (changelog for a rewrite that
itself went stale). (#4)
- ADR README index updated for the new + reconciled entries.
