ssl's TLS-PSK callbacks (PskTlsServer) exist only since Python 3.13 - the
first CI run on 3.12 errored in all 20 PSK tests, and the docs confirm
"Added in version 3.13".
- PskTlsServer._make_context raises a clear RuntimeError naming the
requirement instead of AttributeError; a source pin keeps the guard.
- tests/test_scp81.py skips PskTlsServerTest where the callbacks are
missing (it runs on 3.13+), so contributors on 3.9-3.12 no longer see
20 failures.
- The READMEs state the requirement, and the Windows notes now strongly
recommend Python 3.13: pyscard has wheels up to 3.13, and on 3.14
pyscard and some pysim dependency wheels are unavailable and build
from source (MSVC). setup.bat and setup.sh print the same guidance.
- Version strings + the PWA cache bumped together (simple-v457).
998 Python + 953 frontend green.