#12395: feat(github): add pull request template

This PR adds a comprehensive pull request template to standardize contributions and improve the review process. ## Changes - Add `.github/PULL_REQUEST_TEMPLATE.md` with structured sections: - **Description** for clear change explanation - **Type of Change** with checkboxes (bug fix, feature, docs, etc.) - **Testing** checklist to ensure quality - **Checklist** for code standards, self-review, and documentation - **AI-Assisted Contribution** section for transparency - **Related Issues** for issue linking - **Screenshots** section for UI changes - **Additional Notes** for extra context ## Benefits - Helps reviewers understand changes quickly - Ensures contributors follow project standards - Provides consistency across all PRs - Reduces back-and-forth by prompting for required info - Encourages testing and documentation updates ## Testing - Template renders correctly in GitHub PR creation UI - All sections are optional to maintain flexibility <!-- greptile_comment --> <h2>Greptile Overview</h2> <h3>Greptile Summary</h3> Adds a single repository-wide pull request template at `.github/PULL_REQUEST_TEMPLATE.md` to standardize PR descriptions (change type, testing, checklists, related issues, screenshots, and AI-assisted contribution disclosure). This integrates with GitHub’s PR creation UI so new pull requests are pre-populated with the structured prompts, improving consistency without touching runtime code. <h3>Confidence Score: 5/5</h3> - This PR is safe to merge with minimal risk. - Change is limited to adding a GitHub PR template; it does not affect build artifacts, runtime logic, or dependency graph, and is unlikely to break existing workflows. - No files require special attention <!-- greptile_other_comments_section --> _{(3/5) Reply to the agent's comments like "Can you suggest a fix for this @greptileai?" or ask follow-up questions!} **Context used:** - Context from `dashboard` - CLAUDE.md ([source](https://app.greptile.com/review/custom-context?memory=fd949e91-5c3a-4ab5-90a1-cbe184fd6ce8)) - Context from `dashboard` - AGENTS.md ([source](https://app.greptile.com/review/custom-context?memory=0d0c8278-ef8e-4d6c-ab21-f5527e322f13)) <!-- /greptile_comment -->