feat(email): implement full email plugin
Supports Gmail (OAuth + filter API), Microsoft 365 (OAuth + full rule CRUD via
O365), ProtonMail (Bridge, paid only), and generic IMAP/SMTP providers.
16 tools: list_inbox, read, send, reply, forward, move, delete, mark_read,
search, list_folders, create_folder, inbox_summary, list_rules, create_rule,
delete_rule, bulk_action.
Background daemon task monitors inbox via IMAP IDLE and publishes new-email
events to daemon/events.py for messaging bot pickup. Setup wizard warns
explicitly about ProtonMail Bridge + paid plan requirement and recommends
a messaging bot if none is configured.
36 unit tests covering: HTML stripping, header decoding, raw message parsing,
IMAP search builder, Gmail/Outlook rule normalisation, folder-not-found path,
events bus, Bridge connectivity guard, and tool approval flags.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
curo1305
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