usort

Pessimist depends on a prerelease version of honesty, and I doubt anyone is adding new deps to usort anymore.

Both guards used , so they only raised when both fields mismatched simultaneously. + (same name, different asname) and + (same sort_key, different stem) silently succeeded. Change to so either mismatch raises. Add three regression tests that target each of the two previously-dead raise sites.

sys.exc_info() always returned (None, None, None) inside __attrs_post_init__ because the except clause had already exited by the time Result was constructed. Move traceback capture to each except block in api.py using e.__traceback__, and remove the now-dead __attrs_post_init__ from Result (along with the sys/traceback imports that were only needed for it).