docs(community): add GitHub contribution templates

.github/CODE_OF_CONDUCT.md

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+# CCS Code of Conduct
+
+CCS is a technical project. Keep discussion respectful, constructive, and focused on improving the work.
+
+## Expected Behavior
+
+- Be respectful in issues, pull requests, reviews, and discussions.
+- Assume good intent and ask clarifying questions before escalating.
+- Give feedback that is specific, technical, and actionable.
+- Be patient with contributors who are new to the codebase or toolchain.
+- Respect maintainers' time by keeping reports reproducible and well scoped.
+
+## Unacceptable Behavior
+
+- Harassment, discrimination, or hate speech
+- Personal attacks, insults, or hostile dogpiling
+- Publishing private information, credentials, logs, or screenshots that expose sensitive data
+- Spam, repeated derailment, or intentionally disruptive behavior
+- Sexualized language or unwelcome sexual attention
+
+## Scope
+
+This applies to project spaces, including:
+
+- GitHub issues
+- Pull requests and review comments
+- Discussions
+- Any other repository-managed collaboration channel
+
+## Enforcement
+
+Maintainers may edit or remove content, lock conversations, close threads, reject contributions, or block participants when needed to protect the project and contributors.
+
+For non-sensitive concerns, open a GitHub Discussion or issue.
+
+For sensitive concerns, do not post details publicly. Ask a maintainer for a private reporting path first and keep the initial message minimal.
+
+## Practical Rule
+
+Critique code, behavior, and decisions. Do not attack people.