update to 3.26.0: fix deprecation re -[ksp|snes]_monitor_short by con… …verting those instances to -.._converged_reason
keep the main README cleaner
make Chapter 13 Python tests less fragile
update C tests to v3.25.1
test changes for firedrake 2025.10.2
I think this should have been fixed in previous commit
update python test outputs, now that I am sure mpi is making sense
maintenance: avoid deprecation message re VTKFile
minor one-word add