* fix(email): close IMAP socket when connect/login fails (#3174)
_imap_connect opened a live socket via _open_imap_connection and then
called conn.login() with no try/finally, and _open_imap_connection called
conn.starttls() unguarded. When auth fails (e.g. an Office 365 app password
on an MFA-enabled tenant, #3174) or STARTTLS is rejected, the already-open
socket was orphaned. Every IMAP caller funnels through _imap_connect,
including the 30-minute _auto_summarize_poller, so a persistently
misconfigured account leaked one descriptor per pass toward FD exhaustion.
The previously merged leak fixes (#1325/#1330/#1423/#1530) only guard the
post-connect body and monkeypatch _imap_connect to succeed, so this
connect-time path was uncovered. Wrap login() and starttls() so a failure
calls conn.shutdown() (low-level close; logout() can't run pre-auth) before
re-raising. Adds two regression tests that fail without the guard.
* fix(email): guard MCP IMAP+SMTP connect-time leaks too (#3174)
Folds in the sibling connect-time leaks vdmkenny flagged on #3363, so the
whole connect-then-step leak class is closed in one place:
- mcp_servers/email_server.py::_imap_connect — guard starttls() and login();
close pre-auth with conn.shutdown() before re-raising.
- mcp_servers/email_server.py::_smtp_connect — guard starttls() and login();
SMTP has no shutdown(), so close with conn.close() (socket close, no QUIT).
Routes SMTP (_send_smtp_message) is already safe via 'with smtplib.SMTP(...)'.
Adds four regression tests (one per guard), verified to fail without the fix.
932b7f2446