docs: add self-assign issues guideline to CLAUDE.md

[jwm4]

Summary

Adds a guideline to the Agent Guidelines section of CLAUDE.md instructing agents to self-assign GitHub issues immediately when starting work on them.

This prevents duplicate effort — we had a contributor (Jeremy Eder) independently implement the same #414 fix while we were working on it in PR #415, because the issue wasn't claimed.

Test plan

• No code changes; docs-only

🤖 Generated with Claude Code under the supervision of Bill Murdock

Summary by CodeRabbit

• Documentation
  • Added agent guideline to self-assign GitHub issues when beginning work, preventing duplicate effort.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Enterprise

Run ID: 3255ac0b-be3e-43e9-a9bd-6b47421044da

📥 Commits

Reviewing files that changed from the base of the PR and between d8783b5 and 51b2348.

📒 Files selected for processing (1)

• CLAUDE.md

📝 Walkthrough

Walkthrough

Added a contributor guideline to self-assign GitHub issues immediately upon starting work, ensuring issue assignment as a conflict-prevention mechanism in multi-contributor environments.

Changes

Contributor Guidelines Documentation

Layer / File(s)	Summary
Self-assignment workflow guideline CLAUDE.md	New guideline instructs contributors to self-assign issues at the start of work, reducing the risk of duplicate effort when multiple contributors are active on the same issue.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title follows Conventional Commits format with type 'docs' and clearly describes the main change: adding a self-assign issues guideline to CLAUDE.md.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/self-assign-issues-guideline

✨ Simplify code

• Create PR with simplified code
• Commit simplified code in branch docs/self-assign-issues-guideline

Warning

Review ran into problems

🔥 Problems

Timed out fetching pipeline failures after 30000ms

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[github-actions]

📈 Test Coverage Report

Branch	Coverage
This PR	72.5%
Main	72.5%
Diff	✅ +0%

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Coverage calculated from unit tests only

[github-actions]

🎉 This PR is included in version 2.36.0 🎉

The release is available on GitHub release

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