test: run example files as CI tests; fix bugs they surface (PRI-328)#327

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adrian/pri-328-run-example-file-tests-in-ci-fix-bugs-skip-if-missing-depsPriorLabs/tabpfn-extensions:adrian/pri-328-run-example-file-tests-in-ci-fix-bugs-skip-if-missing-depsCopy head branch name to clipboard