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.Infrastructure/Repositories/ContextEventRepository.cs

@@ -0,0 +1,34 @@
+using Microsoft.EntityFrameworkCore;
+using TaskTracker.Core.Entities;
+using TaskTracker.Core.Interfaces;
+using TaskTracker.Infrastructure.Data;
+
+namespace TaskTracker.Infrastructure.Repositories;
+
+public class ContextEventRepository(TaskTrackerDbContext db) : IContextEventRepository
+{
+    public async Task<ContextEvent> CreateAsync(ContextEvent contextEvent)
+    {
+        contextEvent.Timestamp = DateTime.UtcNow;
+        db.ContextEvents.Add(contextEvent);
+        await db.SaveChangesAsync();
+        return contextEvent;
+    }
+
+    public async Task<List<ContextEvent>> GetRecentAsync(int minutes = 30)
+    {
+        var since = DateTime.UtcNow.AddMinutes(-minutes);
+        return await db.ContextEvents
+            .Where(c => c.Timestamp >= since)
+            .OrderByDescending(c => c.Timestamp)
+            .ToListAsync();
+    }
+
+    public async Task<List<ContextEvent>> GetByTaskIdAsync(int taskId)
+    {
+        return await db.ContextEvents
+            .Where(c => c.WorkTaskId == taskId)
+            .OrderByDescending(c => c.Timestamp)
+            .ToListAsync();
+    }
+}