docs(contributing): clarify self-assignment policy for issues

[jmr]

Update the contributing guidelines to explicitly state that only issues labeled with "help wanted" are eligible for self-assignment using the /assign command. This helps guide contributors toward tasks that have been vetted and are ready for community participation.

This prevents wasting time trying to self-assign issues where it will just fail:

#4101 (comment)

Summary

Update the contributing guidelines to clarify that only issues labeled "help wanted" can be self-assigned via the /assign command.

Details

The previous wording implied any issue could be self-assigned, which led to confusion when the bot rejected assignments on ineligible issues. This change explicitly links to the "help wanted" filter to
guide contributors toward vetted tasks and prevent them from wasting time.

Related Issues

None.

How to Validate

1. Review the modified "Self-assigning and unassigning issues" section in CONTRIBUTING.md.
2. Verify the markdown link correctly points to the help wanted issue filter.

Pre-Merge Checklist

• Updated relevant documentation and README (if needed)
• Added/updated tests (if needed)
• Noted breaking changes (if any)
• Validated on required platforms/methods:
  • MacOS
    • npm run
    • npx
    • Docker
    • Podman
    • Seatbelt
  • Windows
    • npm run
    • npx
    • Docker
  • Linux
    • npm run
    • npx
    • Docker

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request refines the project's contributing guidelines to provide clearer instructions regarding issue self-assignment. By specifying that only "help wanted" issues can be self-assigned, it streamlines the contribution process, reduces potential confusion for new contributors, and ensures that community efforts are directed towards tasks that are ready for external involvement.

Highlights

• Clarified Self-Assignment Policy: Updated the contributing guidelines to explicitly state that only issues labeled with "help wanted" are eligible for self-assignment using the /assign command.
• Improved Contributor Guidance: The change aims to guide contributors toward vetted tasks and prevent them from wasting time attempting to self-assign ineligible issues.

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[gemini-code-assist]

Code Review

This pull request updates the CONTRIBUTING.md file to clarify the policy on self-assigning issues. The change specifies that only issues with the 'help wanted' label are eligible for self-assignment. This is a useful clarification that improves the contribution guidelines and helps manage contributor expectations. The change is accurate and well-written. I have not identified any issues of high or critical severity.

_{Note: Security Review has been skipped due to the limited scope of the PR.}