v0.4.0

What's Changed

• Plan: Reorganize documentation structure and consolidate agent configs by @jeduden in #51
• Refactor: Extract development guide to shared DEVELOPMENT.md by @jeduden in #52
• Mark plan-70 complete by @jeduden in #53
• Update MDS020 description to surface front matter validation by @jeduden in #54
• Include enhancements: link adjustment and heading-level by @jeduden in #55
• Support diff3-style merge conflict markers in merge driver by @jeduden in #57
• Fix override pattern matching to support basename matching by @jeduden in #58
• Add MDS031 rule to detect unclosed fenced code blocks by @jeduden in #59
• Add MDS032 rule to enforce non-empty alt text on images by @jeduden in #60
• Plan: Replace inline rule examples with fixture includes by @jeduden in #61
• Add PR fixup workflow documentation for CI and review management by @jeduden in #62
• Enforce front matter with diagnostics in bad fixture files by @jeduden in #63
• Fix skill formatting and add frontmatter validation by @jeduden in #64

Full Changelog: v0.3.0...v0.4.0