docs: add CODE_OF_CONDUCT

Adapted from Contributor Covenant v2.1.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: erikhoward

CODE_OF_CONDUCT.md

@@ -0,0 +1,39 @@
+# Code of Conduct
+
+## Our Pledge
+
+We are committed to making participation in our community a positive experience for everyone, regardless of age, body size, disability, ethnicity, gender identity and expression, level of experience, nationality, personal appearance, race, religion, or sexual identity and orientation.
+
+## Our Standards
+
+### Expected Behavior
+
+- Be respectful and considerate in all interactions
+- Welcome newcomers and help them get started
+- Accept constructive feedback gracefully
+- Focus on what is best for the community
+- Show empathy towards other community members
+- Use inclusive language
+
+### Unacceptable Behavior
+
+- Personal attacks or inflammatory comments
+- Trolling or deliberately disruptive behavior
+- Publishing others' private information without permission
+- Any conduct that would be inappropriate in a professional setting
+
+## Scope
+
+This Code of Conduct applies to all community spaces, including the GitHub repository, issue tracker, pull requests, and any other communication channels associated with the project.
+
+## Enforcement
+
+Project maintainers are responsible for clarifying and enforcing standards of acceptable behavior. They may take appropriate corrective action in response to any behavior they deem inappropriate, including temporary or permanent removal from the community.
+
+## Reporting
+
+If you experience or witness unacceptable behavior, please report it by contacting the project maintainers. All reports 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.