Storage:
- contacts sled tree: auto-tracked on send/receive
- fingerprint, alias, first_seen, last_seen, message_count
- history sled tree: all messages stored locally
- key: hist:<peer_fp>:<timestamp>:<uuid> for ordered scan
- sender, text, is_self, timestamp
TUI commands:
- /contacts or /c — list all contacts (sorted by most recent)
Shows alias, fingerprint, message count
- /history or /h — show last 50 messages with current peer
- /h <fingerprint> — show history with specific peer
Auto-tracking:
- On send: touch_contact + store_message (is_self=true)
- On receive: touch_contact + store_message (is_self=false)
- Both KeyExchange and Message variants tracked
Backup: contacts + history included in export_all (encrypted backup).
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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