[WIP] Streaming/chunked tool results: Implement for large/long-running operations

[Copilot]

• Explore repository structure and understand current MCP implementation
• Analyze MCP SDK progress notification capabilities
• Identify tools that can benefit from streaming (bookmark_search, export_bookmarks, highlight_list, batch_operations)
• Implement progress notifications for bookmark_search with chunked results
• Add streaming support for highlight_list operations
• Implement progress tracking for bookmark_batch_operations
• Add progress notifications for export_bookmarks
• Update tool metadata to document streaming capabilities
• Test streaming functionality validation
• Update documentation and manifest
• Integration testing with actual API calls
• Performance optimization for large datasets

Key Features Implemented:

🔄 Streaming/Chunked Results:

• bookmark_search: Chunked search results with streamResults parameter
• highlight_list: Chunked highlight retrieval with progress tracking
• bookmark_batch_operations: Progress notifications for batch operations with enableProgress parameter
• export_bookmarks: Background export monitoring with monitorProgress parameter
• export_status: Continuous progress tracking with trackProgress parameter

📡 Progress Notifications:

• Uses MCP standard notifications/progress method for STDIO transport
• Leverages existing SSE infrastructure for HTTP transport
• Real-time progress updates with completion percentages
• Graceful error handling and reporting

📋 Updated Documentation:

• Manifest includes streaming capabilities metadata
• Tool descriptions mention streaming support
• Added comprehensive STREAMING.md documentation
• Updated keywords to include "streaming" and "progress-notifications"

🧪 Testing:

• Created streaming capabilities validation test
• Verifies implementation structure and features
• Confirms manifest documentation completeness

Fixes #11.

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