chore: add CHANGELOG and CONTRIBUTING

Author: teovl

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project are documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [v0.1.0]
+
+Initial release.

CONTRIBUTING.md

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+# Contributing
+
+Thanks for your interest in contributing to `docs` — Pilot Protocol design docs — specs, runbooks, whitepaper, IETF drafts, research papers.
+
+## Quick start
+
+```bash
+git clone https://github.com/pilot-protocol/docs.git
+cd docs
+# review markdown locally
+```
+
+## Pull requests
+
+1. Open an issue first for non-trivial changes so design can be discussed.
+2. Branch off `main`; keep changes focused and self-contained.
+3. Tests are required for new behavior; passing CI is required to merge.
+4. Coverage should not regress (Codecov reports per-PR delta).
+5. Conventional commit style is preferred (`feat:`, `fix:`, `docs:`, `chore:`, …) but not enforced.
+
+## Code of conduct
+
+Be respectful and constructive. Project maintainers will moderate.
+
+## License
+
+By contributing you agree your contributions will be released under the
+project's license (AGPL-3.0-or-later — see `LICENSE`).