Add one-command Kaggle pre-upload release gate

[karlwaldman]

Summary

• add a one-command pre-upload gate that regenerates notebooks, rejects drift, scans secrets, validates JSON, executes exact cells against production-shaped fixtures, and builds Kaggle CLI packages
• align CI with the documented Python SDK 1.11.0 pin and run the same operator gate used locally
• document deterministic notebook authoring, Kaggle Secrets, failure recovery, package/publish/status steps, public-output review, and honest distribution/SEO rules

Verification

• clean Python virtual environment
• ./scripts/validate_before_upload.sh
• 5 notebook contract tests pass; both exact notebooks execute against fixtures
• secret scan and deterministic regeneration pass
• both public Kaggle packages build
• git diff --check

No Kaggle kernel was published or updated by this PR.

Closes #5
Closes #6

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: e17fec02-4096-4c4e-a06a-a0500f7f39a7

📥 Commits

Reviewing files that changed from the base of the PR and between ec45c03 and db81ef2.

📒 Files selected for processing (4)

• .github/workflows/validate.yml
• KAGGLE_BEST_PRACTICES.md
• README.md
• scripts/validate_before_upload.sh

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/issues-5-6-kaggle-practices

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