feat: enhance documentation system with Handoffs integration and structured guidelines

handoffs/0-instructions/M-milestone-prompt.md

@@ -0,0 +1,29 @@
+# Milestone Document Processing Instructions
+
+Please process all milestone summary documents (0-prefixed files in milestone directories) to build comprehensive project context. After reading, provide a high-level overview that includes:
+
+1. Project Evolution
+   - Completed project phases
+   - Major features implemented
+   - Architectural changes
+   - Technical debt addressed
+
+2. System Architecture
+   - Core components
+   - Integration points
+   - Data flows
+   - Performance characteristics
+
+3. Lessons Learned
+   - Technical insights
+   - Implementation patterns
+   - Avoided pitfalls
+   - Performance optimizations
+
+4. Project Health
+   - Code quality metrics
+   - Test coverage
+   - Documentation status
+   - Technical debt status
+
+After processing, respond with "MILESTONE CONTEXT INTEGRATED" followed by your summary to confirm you've absorbed the project context.