Adds domain-skills/kaggle/notebook-editor.md with field-tested mechanics for driving the Kaggle notebook editor:

• Private notebooks 404 over plain HTTP and even authenticated in-page fetch only returns an SPA shell — the editor DOM is the data source.
• Replacing a draft with a local .ipynb via File → Import Notebook, using the input[data-testid="file-uploader-input"] selector (the page also has a decoy image-upload input).
• Committing with Save & Run All, including the version-name field that ignores CDP Input.insertText (it's optional — skip it).
• Polling commit status from the Active Events widget text (Version #N ... Running: Xm).
• Reading a committed version's cell outputs from the kaggleusercontent.com/kf/... iframe via iframe_target().

Learned while uploading and running a training notebook end-to-end on a private, collaborator-owned notebook.

🤖 Generated with Claude Code

Summary by cubic

Adds a Kaggle notebook editor domain skill with reliable steps to import a local .ipynb, commit with Save & Run All, poll run status, and read outputs from the editor DOM for private notebooks. Includes notes on traps like draft ConcurrencyViolation and version lag.

• New Features
  • Import local .ipynb via File → Import using input[data-testid="file-uploader-input"] (avoid the decoy image input).
  • Commit runs with “Save & Run All”; version name is optional and ignores CDP text; confirm GPU/Internet in Session options.
  • Poll run status via the Active Events widget text (e.g., “Version #N … Running”).
  • Read committed outputs from the kaggleusercontent.com/kf/... iframe; prefer printed values over HTML tables.
  • Traps: editor may open in “Viewing Version N” (use back arrow); queued commits show no duration; draft ConcurrencyViolation can roll back the last import (reload, re-import, save); the viewer’s default version can lag—select the version explicitly.

^{Written for commit 10ffa15. Summary will update on new commits.}