chore(contributing): align contribution conventions

[jingxiang-z]

Description

Checklist

• I am familiar with the Contributing Guidelines.
• My commits are signed off (git commit -s) per the Contributing Guidelines.
• New or existing tests cover these changes.
• The documentation is up to date with these changes.

Summary by CodeRabbit

• Documentation
  • Updated contribution guidance with commit and pull request formatting, sign-off, branch naming, and merge requirements.
  • Updated the pull request template with breaking-change and validation sections.
• Chores
  • Added automatic validation of pull request titles against the project’s accepted format.

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository: NVIDIA/fleet-intelligence-client/.coderabbit.yaml

Review profile: CHILL

Plan: Enterprise

Run ID: 97686838-a3db-40f5-bfa6-c7e47201c22a

📥 Commits

Reviewing files that changed from the base of the PR and between 1b96f1b and b1549a6.

📒 Files selected for processing (3)

• .github/PULL_REQUEST_TEMPLATE.md
• .github/workflows/contribution-conventions.yml
• CONTRIBUTING.md

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📝 Walkthrough

Walkthrough

The pull request adds shared contribution guidance, updates the pull request template, and introduces a GitHub Actions check that validates pull request titles.

Changes

Contribution conventions

Layer / File(s)	Summary
Document contribution conventions .github/PULL_REQUEST_TEMPLATE.md, CONTRIBUTING.md	The template adds title-format guidance, breaking-change and validation prompts, and a sign-off requirement. CONTRIBUTING.md describes commit and pull request conventions, and links local hooks guidance to the shared conventions.
Validate pull request titles .github/workflows/contribution-conventions.yml, CONTRIBUTING.md	The workflow checks pull request titles on specified events and fails titles that do not match the allowed format. CONTRIBUTING.md describes the check and its configuration.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Other

Merge Risk: ⚪ Minimal · up to b1549

This PR adds contribution guidance and a title-format check. The check treats titles as data and enforces the documented format; no actionable merge risk remains.

🚥 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 clearly and concisely describes the main change: aligning contribution conventions across the PR template, workflow, and CONTRIBUTING.md.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
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.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Commit to this branch
• Create a new PR

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