Initial ChronoSeal release

CONTRIBUTING.md

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+# Contributing
+
+## Requirements
+
+- Rust stable
+- wasm-pack
+- NodeJS (optional frontend tooling)
+
+## Development
+
+```bash
+cargo fmt
+cargo clippy
+cargo test
+```
+
+## Guidelines
+
+- Keep security-sensitive logic inside Rust/WASM
+- Avoid placing trust logic in JavaScript
+- Preserve silent-failure behavior
+- Maintain deterministic protocol serialization