feat: add react-markdown dependency and update README with release process

CHANGELOG.md

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+# Changelog
+
+All notable changes to Pulse (frontend and product) are documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/), and Pulse uses [Semantic Versioning](https://semver.org/spec/v2.0.0.html) with a **0.x.y** version scheme while in initial development. The leading `0` indicates that the public API and behaviour may change until we release **1.0.0**.
+
+## [Unreleased]
+
+- No unreleased changes yet; add items here as you work toward the next release.
+
+## [0.1.0] - 2026-02-09
+
+### Added
+
+- Initial changelog and release process (PULSE-28).
+- Release documentation in `docs/releasing.md` and optional changelog check script.
+
+---
+
+[Unreleased]: https://github.com/ciphera-net/pulse/compare/v0.1.0...HEAD
+[0.1.0]: https://github.com/ciphera-net/pulse/releases/tag/v0.1.0