update

Co-authored-by: Copilot <copilot@github.com>

CHANGELOG.md

@@ -4,11 +4,12 @@ All notable changes to this project will be documented in this file.
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 
----
+______________________________________________________________________
 
 ## [Unreleased]
 
 ### Added
+
 - `README.md` — project overview, description, example workflow, supported distributions, and suggested tooling
 - `ROADMAP.md` — phased development plan covering decisions, data collection, AI integration, CLI design, and hardening
 - `CHANGELOG.md` — this file; established changelog tracking for the project
@@ -27,8 +28,10 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 - Test scaffold (`pytest`) with initial parser and CLI coverage
 - SSH test coverage for policy checks, SSH argument construction, and config summary behavior
 - CI workflow for lint (`ruff`), type-check (`mypy`), and tests (`pytest`)
+- CI coverage expanded with Markdown formatting checks (`mdformat --check`) and YAML linting (`yamllint`)
 
 ### Decided
+
 - Implementation language: **Python**
 - Distribution strategy: single distributable binary via **Nuitka** (PyInstaller as fallback)
 - SSH authentication: **keypair only** (ed25519/RSA); auto-accept new hosts; hard reject on host key change with MITM warning