docs: stop crediting from None with secret hygiene

A TimeoutExpired chained without from None already prints no secret,
since its __str__ shows only the command and the duration. The suppressed
display buys a tidier traceback, not a narrower leak, and the comments
claimed otherwise. The from None calls stay.

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

1 files changed, 3 insertions, 2 deletions

diff --git a/test_llamachat.py b/test_llamachat.py
index 5ee2310..b943976 100755
--- a/test_llamachat.py
+++ b/test_llamachat.py
@@ -1154,8 +1154,9 @@ def test_key_resolution():
         assert "gpg-agent" in str(exc)
         # The partial stdout a timeout captures must never reach the message.
         assert "partial-secret" not in str(exc)
-        # `from None` suppresses the chained traceback. It does not clear
-        # __context__, so this pins the display behavior, not unreachability.
+        # `from None` suppresses the chained-traceback display. It does not
+        # clear __context__, and the chained traceback would not have shown
+        # the secret anyway, so this pins tidiness, not secret hygiene.
         assert exc.__suppress_context__ and exc.__cause__ is None
 
     # A non-zero exit quotes gpg's stderr, which is the only useful part, and