Test error handling through public commands

[adamtheturtle]

Summary

• update vws-python-mock to the released 2026.8.26
• exercise shared VWS and Cloud Reco failures through public CLI commands backed by MockVWS
• send the now-required views array for Model Target models and match shared standard/advanced dataset visibility
• keep defensive Model Target fallbacks without using injected private-call tests
• keep the Cloud Reco formatter private now that tests no longer import it

This is stacked on #2508 because the error-handling cases being revised were added there.

Testing

• uv run prek run --all-files --hook-stage pre-commit
• uv run pytest -s -q --cov-fail-under 100 --cov=src/ --cov=tests . (151 passed, 100% coverage)
• mypy, pyright, pyrefly, and ty

Dependency release

• VWS-Python/vws-python-mock 2026.08.26
• release workflow: https://github.com/VWS-Python/vws-python-mock/actions/runs/32952026742