T06: Mail plugin backend — IMAP/SMTP, threading, templates, rules, PGP, vacation, delegates — 46 tests, 74.56% coverage
- 14 SQLAlchemy models (mail_accounts, mail_folders, mails, attachments, labels, rules, templates, signatures, etc.) - AES-256 encrypted credential storage - IMAP sync service (ARQ-ready, sync trigger endpoint) - SMTP send/reply/forward service - Mail rule engine (condition matching → move/label/flag/forward) - Vacation auto-reply with dedup (vacation_sent_log) - PGP integration (key import, encrypt/decrypt, contact public keys) - Shared mailboxes with delegate access + send permissions - HTML sanitization (nh3) - Full-text search (ILIKE fallback, tsvector-ready) - Thread grouping via References/In-Reply-To headers - Template variable substitution - Contact/company auto-linking from email addresses - Calendar event creation from mail - 46 tests covering all 40 acceptance criteria - Ruff lint clean, format clean - Full regression: 527 tests pass (0 failures)
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