submit_to_kaggle: readable result + graceful auth handling#2
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The kaggle CLI exits 0 and prints "Successfully submitted ..." buried under a version-upgrade warning, so the raw CompletedProcess repr didn't make success obvious; a missing token produced an ugly traceback. - Return a KaggleSubmissionResult (truthy on success, clean __repr__, Kaggle's response on .detail, raw process on .process/.stdout/.stderr) and print a one-line ✅/❌ status (verbose=True). - Detect success from the "Successfully submitted" marker, not just the exit code (the CLI can exit 0 on some errors), and drop the version warning noise. - Fail fast with actionable guidance when no credentials are configured; give a clean auth message when the CLI rejects them. - Check installation with importlib.util.find_spec instead of `import kaggle`, which authenticates eagerly and would raise just from the availability check. - tests/test_competition_submission.py: offline coverage (subprocess mocked). - examples/submit_pnpl2026.ipynb: display the result object; use the real pnpl-competition-2026 slug.
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The kaggle CLI exits 0 and prints "Successfully submitted ..." buried under a version-upgrade warning, so the raw CompletedProcess repr didn't make success obvious; a missing token produced an ugly traceback.
import kaggle, which authenticates eagerly and would raise just from the availability check.