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docs/contribution-guide.md

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+# Contribution Guide
+
+## Setup
+
+1. Install Node.js 20+.
+2. Run `npm install`.
+3. Run `npm run dev`.
+4. Run `npm run docker-up` to verify the single-container path.
+
+## Expectations
+
+- Keep client gameplay code under `client/src/game`.
+- Keep API and persistence code under `server/src`.
+- Keep production assumptions aligned with the single-container deployment model.
+- Prefer small milestone-focused changesets.
+
+## CI Baseline
+
+The repo includes a first-pass workflow that runs install, lint, test, build, and Docker build checks on pushes and pull requests.
+