docs: add new contributors section to contribution guidelines

[saubyk]

Advise new contributors to build a PR review track record before submitting code, or to open a detailed issue when they spot a bug.

[gemini-code-assist]

Summary of Changes

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This pull request updates the project's contribution guidelines to introduce a new policy for new contributors. The goal is to encourage new developers to engage with the project through code reviews and detailed issue reporting rather than submitting code directly, helping to manage the influx of contributions in the era of AI-assisted coding.

Highlights

• New Contributor Policy: Added a new section to the contribution guidelines that advises new contributors to build a PR review track record before submitting code.
• Documentation Structure: Updated the table of contents in the contribution guidelines to include the new section.

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[gemini-code-assist]

Code Review

This pull request updates the code contribution guidelines to introduce a new policy for new contributors, requiring them to establish a track record of pull request reviews before submitting code due to the prevalence of AI-assisted tools. A review comment suggested grammatical and phrasing improvements to the new section to enhance readability and flow.

[github-actions]

🟢 PR Severity: LOW

Automated classification | 1 file | 20 lines changed

🟢 Low (1 file)

• docs/code_contribution_guidelines.md - documentation file under docs/*

Analysis

This PR modifies only a single documentation file (docs/code_contribution_guidelines.md). Documentation files under docs/* are classified as LOW severity per the classification rules. No code changes are present, and no severity bump conditions apply (1 file changed, 20 lines changed — well below the thresholds of 20 files or 500 lines).

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_{To override, add a severity-override-{critical,high,medium,low} label.}
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[hieblmi]

LGTM!

[ziggie1984]

Makes a lot of sense to restrict contributions more having seen a lot of AI-generated slope lately.

[ziggie1984]

Nit: remove necessarily or describe what you mean by it.