ci: Skip reviews for PRs with [citest_skip] in the title

[spetrosi]

• Add info about .coderabbit.yam for AI assistants to contributing.md
• Note that CodeRabbit uses config from the main branch so this change will apply
  after this PR is merged.

Summary by CodeRabbit

• Documentation

  • Updated contributor guidelines with new "AI Coding Assistants" section outlining coding standards and requirements.

• Chores

  • Updated code review configuration to skip automated reviews for PRs with [citest_skip] in the title.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 5d57cee3-df1a-448e-97f9-dc2933893d9f

📥 Commits

Reviewing files that changed from the base of the PR and between 0e36db7 and e66f182.

📒 Files selected for processing (2)

• .coderabbit.yaml
• contributing.md

✅ Files skipped from review due to trivial changes (2)

• contributing.md
• .coderabbit.yaml

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📝 Walkthrough

Walkthrough

This PR adds a configuration option to skip CodeRabbit auto-review for test PR titles containing [citest_skip] and documents the CodeRabbit policy in contributing.md to guide contributors on AI-generated contributions.

Changes

Auto-review skip configuration

Layer / File(s)	Summary
Auto-review skip configuration and documentation .coderabbit.yaml, contributing.md	CodeRabbit auto-review is disabled for PR titles with [citest_skip], and contributing.md directs contributors to .coderabbit.yaml for AI coding standards.

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🎯 1 (Trivial) | ⏱️ ~3 minutes

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The description is incomplete and does not follow the required template structure with Enhancement, Reason, and Result sections.	Restructure the description to match the template with clear Enhancement, Reason, Result, and Issue Tracker sections for better clarity and consistency.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately reflects the main change: configuring automated reviews to skip PRs with [citest_skip] in the title, which aligns with the primary objective.
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 coderabbit-skip

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_{Comment @coderabbitai help to get the list of available commands and usage tips.}