Implement Phase 1 Enhanced GitHub Pages Interface with Task Dashboard and Matrix Bot Integration

[Copilot]

This PR implements the first phase of the Issue Management System design outlined in ISSUE_MANAGEMENT.md, transforming the basic task listing into an interactive dashboard with enhanced search capabilities and Matrix bot integration.

Enhanced GitHub Pages Interface

The /status/tasks/ page has been completely redesigned with:

• Task Statistics Dashboard: Visual cards displaying real-time counts of open tasks, completed tasks, and active phases
• Interactive Search & Filtering: Real-time search input and dropdown filters for status and phase selection
• Modern Card Layout: Clean, academic-themed task cards with status badges and metadata
• Responsive Design: Mobile-friendly interface that gracefully degrades when JavaScript is disabled
• JSON API Endpoint: New /api/tasks.json providing programmatic access to task data and statistics

Matrix Bot Enhancement

Extended the existing !tasks command with new sub-commands:

!tasks summary    # Shows project statistics and phase breakdown
!tasks search <query>    # Searches tasks by keyword in title/content

The implementation maintains full backward compatibility with the existing !tasks command while adding powerful new functionality for task discovery and project overview.

Technical Implementation

• Performance Optimized: DOM-based filtering provides instant search results without API calls
• Accessible Design: Semantic HTML with proper form controls and ARIA support
• Academic Theme Integration: Styling consistent with the site's scholarly design language
• Comprehensive Testing: Full test coverage including Matrix bot command tests (24/24 tests passing)
• API-First Approach: JSON endpoint enables future integrations and programmatic access

The implementation leverages Jekyll's existing collections system and maintains the directory-based task structure that eliminates merge conflicts, while adding the enhanced visibility and searchability outlined in the Issue Management System design.


Fixes #152.

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