docs: update pre-commit hooks documentation (cms-5h8p) (#51)

- Add mypy (type checking) to hooks list in CONTRIBUTING.md
- Add markdownlint to hooks list in CONTRIBUTING.md
- Auto-fix markdown lint issues in CHANGELOG.md

Co-authored-by: Claude Opus 4.5 <[email protected]>

Author: dreamiurg

CHANGELOG.md

@@ -1,13 +1,11 @@
 ## [3.7.0](https://github.com/dreamiurg/claude-mountaineering-skills/compare/v3.6.0...v3.7.0) (2026-01-30)
 
-
 ### Features
 
 * add production-ready pre-commit hooks ([#50](https://github.com/dreamiurg/claude-mountaineering-skills/issues/50)) ([685ff40](https://github.com/dreamiurg/claude-mountaineering-skills/commit/685ff40a033840c543911b11205086700f9fb07b))
 
 ## [3.6.0](https://github.com/dreamiurg/claude-mountaineering-skills/compare/v3.5.1...v3.6.0) (2026-01-30)
 
-
 ### Features
 
 * parallel agent architecture for route-researcher ([#49](https://github.com/dreamiurg/claude-mountaineering-skills/issues/49)) ([b5db7cd](https://github.com/dreamiurg/claude-mountaineering-skills/commit/b5db7cdafcf9b0aa257e6e5e84c05438d9112de2)), closes [#25](https://github.com/dreamiurg/claude-mountaineering-skills/issues/25) [#25](https://github.com/dreamiurg/claude-mountaineering-skills/issues/25) [#25](https://github.com/dreamiurg/claude-mountaineering-skills/issues/25) [#25](https://github.com/dreamiurg/claude-mountaineering-skills/issues/25) [#25](https://github.com/dreamiurg/claude-mountaineering-skills/issues/25) [#25](https://github.com/dreamiurg/claude-mountaineering-skills/issues/25) [#25](https://github.com/dreamiurg/claude-mountaineering-skills/issues/25) [#25](https://github.com/dreamiurg/claude-mountaineering-skills/issues/25) [#25](https://github.com/dreamiurg/claude-mountaineering-skills/issues/25)

CONTRIBUTING.md

@@ -53,8 +53,10 @@ Thank you for your interest in contributing! This guide will help you get starte
 
    **Pre-commit hooks:**
    - Python formatting and linting (ruff)
+   - Python type checking (mypy)
    - Trailing whitespace and EOF fixes
    - YAML/JSON validation
+   - Markdown linting (markdownlint)
    - Large file prevention
    - Secrets detection (gitleaks)