docs: add GitHub issue and PR templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug Report
+about: Report a bug to help us improve
+title: "bug: "
+labels: bug
+assignees: ""
+---
+
+## Describe the Bug
+
+A clear and concise description of the bug.
+
+## Steps to Reproduce
+
+1. Go to '...'
+2. Run '...'
+3. See error
+
+## Expected Behavior
+
+What you expected to happen.
+
+## Actual Behavior
+
+What actually happened.
+
+## Environment
+
+- OS: [e.g., Windows 11, macOS 14, Ubuntu 22.04]
+- Node.js version: [e.g., 20.x]
+- Claude Code version: [e.g., 1.x]
+
+## Additional Context
+
+Add any other context, screenshots, or log output here.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature Request
+about: Suggest a new feature or improvement
+title: "feat: "
+labels: feature
+assignees: ""
+---
+
+## Problem Statement
+
+A clear description of the problem this feature would solve.
+
+## Proposed Solution
+
+Describe how you'd like this to work.
+
+## Alternatives Considered
+
+Any alternative solutions or workarounds you've considered.
+
+## Additional Context
+
+Add any other context, mockups, or examples here.

.github/PULL_REQUEST_TEMPLATE.md

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+## Summary
+
+<!-- Describe what this PR does and why. -->
+
+## Related Issue
+
+<!-- Link to the issue this PR addresses. -->
+
+Closes #
+
+## Changes
+
+- 
+
+## Test Plan
+
+- [ ] Build passes
+- [ ] Tests pass (if applicable)
+- [ ] Manual verification (if applicable)
+
+## Checklist
+
+- [ ] Code follows project conventions
+- [ ] Changes are minimal and focused
+- [ ] Self-reviewed the diff