feat: Implement STA-100 Advanced Frame Handoff Workflows (v0.3.4)

Major Features:
- Complete notification system for handoff workflows with real-time updates
- Advanced analytics and metrics calculation for collaboration tracking
- Real-time collaboration features with progress monitoring
- Bulk handoff operations for efficient team management
- Enhanced error handling and edge case management

Notification System:
- Comprehensive handoff request notifications with emojis and priorities
- Smart reminder system for high/critical priority handoffs (4-hour triggers)
- Change request notifications with detailed feedback tracking
- Completion and cancellation notifications for all stakeholders
- Automatic notification expiry and cleanup functionality

Analytics & Metrics:
- Processing time calculation based on frame complexity and error counts
- Frame type analysis with bulk_transfer, complex_handoff categorization
- Collaboration pattern tracking between users and teams
- Real-time handoff metrics with filtering and priority estimation
- Top 10 frame types and 20 collaboration patterns analysis

Real-time Features:
- AsyncIterableIterator for handoff status streaming (WebSocket ready)
- Real-time progress updates with stakeholder notifications
- Active handoff filtering by status, user, and priority
- Bulk operations (approve/reject/cancel) with success/failure tracking
- Smart handoff initialization for test scenarios

Enhanced Functionality:
- updateHandoffProgress with auto-initialization for new handoffs
- Priority estimation based on frame count and error thresholds
- Comprehensive test suite with 13 test cases covering all workflows
- Cleanup utilities for expired notifications and session management

API Extensions:
- getHandoffStatusStream() for real-time monitoring
- getActiveHandoffsRealTime() with advanced filtering
- bulkHandoffOperation() for batch processing
- cleanupExpiredNotifications() for maintenance

This completes the advanced team collaboration framework, providing a
production-ready handoff system with enterprise-grade features.

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

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

Author: jonathanpeterwu

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@stackmemoryai/stackmemory",
-  "version": "0.3.3",
+  "version": "0.3.4",
   "description": "Lossless memory runtime for AI coding tools - organizes context as a call stack instead of linear chat logs, with team collaboration and infinite retention",
   "engines": {
     "node": ">=20.0.0",