The default harness loads shared helpers and smoke checks before topic
includes, registers poroelastic and thermo_poroelastic, drops the retired IO
topic, and removes the orphaned ASCII fixture.
- Add zero_alloc_helpers.jl, test_api_contract.jl, test_pkg_hygiene.jl, and
test_inference_smoke.jl included once from runtests.jl
- Extend TOPICS; remove io; clarify test_args accepts topic names only
- Delete test/testdata/cantilever_beam.msh
Jukka Aho