Fix all broken internal links in documentation

Changes:
- Fixed 11 broken internal links across 3 documentation files
- Updated relative paths to use correct format without /docs/ prefix
- Removed broken CHANGELOG.md anchor links (mintlify doesn't support external file anchors)
- Changed /docs/progressive-disclosure → progressive-disclosure
- Changed /docs/hooks-architecture → hooks-architecture
- Changed /docs/context-engineering → context-engineering
- Changed /docs/architecture → architecture/overview
- Changed /docs/worker-service → architecture/worker-service
- Changed /docs/viewer-ui → VIEWER
- Verified with mintlify broken-links: 0 broken links remaining

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

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

docs/architecture-evolution.mdx

@@ -1059,12 +1059,10 @@ The result is a memory system that's both powerful and invisible. Users never no
 
 ## Further Reading
 
-- [Progressive Disclosure](/docs/progressive-disclosure) - The philosophy behind v4
-- [Hooks Architecture](/docs/hooks-architecture) - How hooks power the system
-- [Context Engineering](/docs/context-engineering) - Foundational principles
-- [Viewer UI](/docs/viewer-ui) - Real-time visualization (v5.1.0+)
-- [v5.0.0 Release Notes](/CHANGELOG.md#v500) - Hybrid search architecture
-- [v4.0.0 Release Notes](/CHANGELOG.md#v400) - Progressive disclosure
+- [Progressive Disclosure](progressive-disclosure) - The philosophy behind v4
+- [Hooks Architecture](hooks-architecture) - How hooks power the system
+- [Context Engineering](context-engineering) - Foundational principles
+- [Viewer UI](VIEWER) - Real-time visualization (v5.1.0+)
 
 ---