chore: add CODEOWNERS file

[jamesbhobbs]

Summary

Adds a CODEOWNERS file to establish default code ownership for the repository, copied from the deepnote/deepnote repository configuration.

Changes

• New CODEOWNERS file (.github/CODEOWNERS): Sets @saltenasl @jamesbhobbs @Artmann @andyjakubowski as default owners for all files (*)

Human Review Checklist

• Verify all GitHub usernames are correct and users exist
• Confirm these users have appropriate repository access permissions
• Validate that giving ownership over all files (*) is the intended scope
• Test that GitHub properly recognizes the CODEOWNERS file format

Notes

This change mirrors the CODEOWNERS setup from the main deepnote/deepnote repository to maintain consistent ownership patterns across Deepnote extension repositories.

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Link to Devin run: https://app.devin.ai/sessions/7df2a76e10f2447faf46c3c41fd5cc8c
Requested by: @jamesbhobbs

Summary by CodeRabbit

• Chores
  • Introduced repository code ownership rules to automatically assign default reviewers for any changes, streamlining code reviews and improving accountability across the project. This applies to all areas of the repository. There are no user-facing changes and no impact on runtime behavior, performance, or UI. Development workflow is improved through clearer ownership and faster reviewer assignment.

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📝 Walkthrough

Walkthrough

Adds a new .github/CODEOWNERS file defining a single, repository-wide default rule. All files (*) are assigned four owners: @saltenasl, @jamesbhobbs, @Artmann, and @andyjakubowski. No other paths or patterns are specified. No exports or public APIs are changed.

Possibly related PRs

• chore: add codeowners deepnote#6: Also modifies .github/CODEOWNERS to add repository owners (adds two users), affecting the same default ownership mechanism.
• chore(codeowners): update repository ownership deepnote#26: Updates the default CODEOWNERS line to include @Artmann and @andyjakubowski, directly overlapping with this PR’s owners.
• deepnote/deepnote#18343: Edits .github/CODEOWNERS with specific patterns and GitHub Actions ownership, interacting with the same ownership configuration.

Pre-merge checks

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title Check	✅ Passed	The title succinctly and accurately describes the primary change by indicating that a CODEOWNERS file is being added, matching the main content of the changeset.
Docstring Coverage	✅ Passed	No functions found in the changes. Docstring coverage check skipped.

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📜 Recent review details

Configuration used: CodeRabbit UI

Review profile: ASSERTIVE

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 8f22894 and 26f78a5.

📒 Files selected for processing (1)

• .github/CODEOWNERS (1 hunks)

🧰 Additional context used

🧠 Learnings (3)

📓 Common learnings

Learnt from: m1so
PR: deepnote/app-config#1310
File: .github/CODEOWNERS:1-12
Timestamp: 2025-09-11T14:44:52.932Z
Learning: GitHub natively validates CODEOWNERS files for syntax errors and invalid team references, making external validation actions potentially unnecessary for small CODEOWNERS files where human validation is still feasible.

Learnt from: m1so
PR: deepnote/app-config#1310
File: .github/CODEOWNERS:8-8
Timestamp: 2025-09-11T14:45:50.365Z
Learning: In CODEOWNERS files, m1so prefers specific paths over glob patterns when assigning broad ownership groups to avoid unintentionally granting access to other helm charts or configurations that shouldn't be accessible to the same group.

📚 Learning: 2025-09-11T14:45:50.365Z

Learnt from: m1so
PR: deepnote/app-config#1310
File: .github/CODEOWNERS:8-8
Timestamp: 2025-09-11T14:45:50.365Z
Learning: In CODEOWNERS files, m1so prefers specific paths over glob patterns when assigning broad ownership groups to avoid unintentionally granting access to other helm charts or configurations that shouldn't be accessible to the same group.

Applied to files:

• .github/CODEOWNERS

📚 Learning: 2025-09-11T14:44:52.932Z

Learnt from: m1so
PR: deepnote/app-config#1310
File: .github/CODEOWNERS:1-12
Timestamp: 2025-09-11T14:44:52.932Z
Learning: GitHub natively validates CODEOWNERS files for syntax errors and invalid team references, making external validation actions potentially unnecessary for small CODEOWNERS files where human validation is still feasible.

Applied to files:

• .github/CODEOWNERS

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• GitHub Check: Lint & Format

🔇 Additional comments (1)

.github/CODEOWNERS (1)

1-2: Confirm repo-wide ownership is intentional. Assigning * to these four users makes them code owners for every path, which diverges from the earlier preference for path-specific patterns. Please confirm this blanket scope is desired for this extension to avoid unintended coverage. (Based on learnings)

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