release: prepare v0.4.0 - Enhanced Edit Mode & Version Tracking

Key improvements:
- Fixed critical md-render --edit functionality that was broken
- Enhanced version tracking with git commit hash, timestamps, and local changes detection
- Comprehensive regression tests to prevent future breaks
- Repository cleanup completed

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

CHANGELOG.md

@@ -0,0 +1,18 @@
+# Changelog
+## [0.4.0] - 2025-10-25
+
+### Added
+- feat: add comprehensive testing and error tracking for edit mode
+
+### Fixed
+- fix: resolve md-render --edit functionality and add enhanced version tracking
+- fix: resolve critical JavaScript syntax errors in md-render --edit
+- fix: resolve md-ingest Path object conversion error
+
+### Other
+- chore: clean up repository documentation files for release
+
+
+
+All notable changes to MarkiTect will be documented in this file.
+