docs(design): accept Testinfra post-install validation plan

Plan to port the VM harness's shell validation sweep (validation.sh, ~26 checks) to Testinfra + pytest for more expressive checks and better reporting, then expand coverage to the parts of archsetup that aren't validated today.

Records the design: where pytest fits in run-test.sh, the SSH connection model (inject a throwaway test key), preserving the three-way issue attribution via pytest markers, smoke/integration tiering, a parity-then-expand migration, and a Goss comparison.

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