docs: add Code of Conduct to outline community expectations and behavior

Author: cak

CODE_OF_CONDUCT.md

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+# Code of Conduct
+
+This Code of Conduct applies to all `secure` community spaces.
+
+## Our Pledge
+
+We’re committed to a welcoming, safe, equitable community for everyone. Treat others with respect and assume good faith.
+
+## Expected Behavior
+
+- Be kind, constructive, and professional.
+- Respect different viewpoints and experiences.
+- Take responsibility for your actions and help repair harm.
+- Give and accept feedback gracefully.
+
+## Unacceptable Behavior
+
+- Harassment, threats, or hate/discrimination.
+- Personal attacks, sexualized behavior, or stereotyping.
+- Sharing someone’s private information without consent.
+- Impersonation, misleading identity, or evasions of enforcement.
+- Spam/promotional content outside community norms.
+
+## Reporting
+
+Report issues to **caleb@typeerror.com**. Maintainers will review reports promptly and handle them as confidentially as possible.
+
+## Enforcement
+
+Maintainers may take action appropriate to the situation, including warnings, temporary limits, suspension, or a permanent ban.
+
+## Scope
+
+Applies in project spaces (issues, PRs, discussions, chats) and when representing the project publicly.
+
+## Attribution
+
+Adapted from the Contributor Covenant v3.0: https://www.contributor-covenant.org/version/3/0/