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CONTRIBUTING.md

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+# Contributing to ypsilanti
+
+Thanks for your interest in ypsilanti.
+
+## Requirements
+
+- [Zig](https://ziglang.org/download/) 0.14 or newer.
+
+## Development
+
+```
+zig build                    # debug build to zig-out/bin/ypsilanti
+zig build run -- serve ./example   # run without installing
+./test.sh                    # build (ReleaseFast) and run the test suite
+```
+
+## Before opening a pull request
+
+- Run `./test.sh` and make sure it passes. CI runs the same script.
+- Add or update tests in `test.sh` when you change behavior.
+- Keep changes focused and the diff minimal; match the surrounding style.
+
+## Reporting bugs
+
+Open an issue with a minimal site (`content/`, `layouts/`, config) that
+reproduces the problem, the command you ran, and what you expected.
+
+## Security
+
+ypsilanti escapes template variables, sanitizes URL schemes, and validates
+internal links at build time. If you find a way around these, please report it
+privately by email rather than opening a public issue.