chore: initial commit of TaskTracker project

Existing ASP.NET API with vanilla JS SPA, WindowWatcher, Chrome extension, and MCP server.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

TaskTracker.Core/Interfaces/ITaskRepository.cs

@@ -0,0 +1,15 @@
+using TaskTracker.Core.Entities;
+using TaskTracker.Core.Enums;
+
+namespace TaskTracker.Core.Interfaces;
+
+public interface ITaskRepository
+{
+    Task<List<WorkTask>> GetAllAsync(WorkTaskStatus? status = null, int? parentId = null, bool includeSubTasks = false);
+    Task<WorkTask?> GetByIdAsync(int id);
+    Task<WorkTask?> GetActiveTaskAsync();
+    Task<List<WorkTask>> GetSubTasksAsync(int parentId);
+    Task<WorkTask> CreateAsync(WorkTask task);
+    Task UpdateAsync(WorkTask task);
+    Task DeleteAsync(int id);
+}