fix(projekt-matching): final-review fixes — safe redeploy, poison-mail hardening, plan deviations note

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

projekt-matching/tests/test_mailer.py

@@ -1,4 +1,6 @@
 import email
+
+import pytest
 from unittest import mock
 
 from projektmatch import mailer
@@ -43,6 +45,22 @@ def test_move_uses_move_then_fallback():
     assert conn.expunge.called
 
 
+def test_fetch_raises_on_no_response():
+    conn = fake_conn()
+    conn.uid.return_value = ("NO", [None])
+    box = mailer.MailBox("u", "p", conn=conn)
+    with pytest.raises(RuntimeError):
+        box.fetch("3")
+
+
+def test_fetch_raises_on_malformed_ok_response():
+    conn = fake_conn()
+    conn.uid.return_value = ("OK", [None])
+    box = mailer.MailBox("u", "p", conn=conn)
+    with pytest.raises(RuntimeError):
+        box.fetch("3")
+
+
 def test_send_mail_starttls():
     with mock.patch("projektmatch.mailer.smtplib.SMTP") as smtp:
         server = smtp.return_value.__enter__.return_value