docs: add Code of Conduct and issue templates

Add Contributor Covenant Code of Conduct and GitHub issue templates
(bug report + feature request) to reach 100% community health score.

.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 what the bug is.
+
+## To Reproduce
+
+Steps to reproduce the behavior:
+
+1. Configure agent with '...'
+2. Call `runTeam(...)` with '...'
+3. See error
+
+## Expected behavior
+
+A clear description of what you expected to happen.
+
+## Error output
+
+```
+Paste any error messages or logs here
+```
+
+## Environment
+
+- OS: [e.g. macOS 14, Ubuntu 22.04]
+- Node.js version: [e.g. 20.11]
+- Package version: [e.g. 0.1.0]
+- LLM provider: [e.g. Anthropic, OpenAI]
+
+## Additional context
+
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature Request
+about: Suggest an idea for this project
+title: "[Feature] "
+labels: enhancement
+assignees: ''
+---
+
+## Problem
+
+A clear description of the problem or limitation you're experiencing.
+
+## Proposed Solution
+
+Describe what you'd like to happen.
+
+## Alternatives Considered
+
+Any alternative solutions or features you've considered.
+
+## Additional context
+
+Add any other context, code examples, or screenshots about the feature request here.

CODE_OF_CONDUCT.md

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+# Contributor Covenant Code of Conduct
+
+## Our Pledge
+
+We as members, contributors, and leaders pledge to make participation in our
+community a positive experience for everyone, regardless of background or
+identity.
+
+## Our Standards
+
+Examples of behavior that contributes to a positive environment:
+
+- Using welcoming and inclusive language
+- Being respectful of differing viewpoints and experiences
+- Gracefully accepting constructive feedback
+- Focusing on what is best for the community
+- Showing empathy towards other community members
+
+Examples of unacceptable behavior:
+
+- Trolling, insulting or derogatory comments, and personal attacks
+- Public or private unwelcome conduct
+- Publishing others' private information without explicit permission
+- Other conduct which could reasonably be considered inappropriate in a
+  professional setting
+
+## Enforcement Responsibilities
+
+Community leaders are responsible for clarifying and enforcing our standards of
+acceptable behavior and will take appropriate and fair corrective action in
+response to any behavior that they deem inappropriate or harmful.
+
+## Scope
+
+This Code of Conduct applies within all community spaces, and also applies when
+an individual is officially representing the community in public spaces.
+
+## Enforcement
+
+Instances of unacceptable behavior may be reported to the community leaders
+responsible for enforcement at **jack@yuanasi.com**. All complaints will be
+reviewed and investigated promptly and fairly.
+
+## Attribution
+
+This Code of Conduct is adapted from the [Contributor Covenant](https://www.contributor-covenant.org),
+version 2.1, available at
+[https://www.contributor-covenant.org/version/2/1/code_of_conduct.html](https://www.contributor-covenant.org/version/2/1/code_of_conduct.html).