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.Api/Controllers/NotesController.cs

@@ -0,0 +1,41 @@
+using Microsoft.AspNetCore.Mvc;
+using TaskTracker.Core.DTOs;
+using TaskTracker.Core.Entities;
+using TaskTracker.Core.Interfaces;
+
+namespace TaskTracker.Api.Controllers;
+
+[ApiController]
+[Route("api/tasks/{taskId:int}/notes")]
+public class NotesController(ITaskRepository taskRepo) : ControllerBase
+{
+    [HttpGet]
+    public async Task<IActionResult> GetNotes(int taskId)
+    {
+        var task = await taskRepo.GetByIdAsync(taskId);
+        if (task is null)
+            return NotFound(ApiResponse.Fail("Task not found"));
+
+        return Ok(ApiResponse<List<TaskNote>>.Ok(task.Notes));
+    }
+
+    [HttpPost]
+    public async Task<IActionResult> AddNote(int taskId, [FromBody] CreateNoteRequest request)
+    {
+        var task = await taskRepo.GetByIdAsync(taskId);
+        if (task is null)
+            return NotFound(ApiResponse.Fail("Task not found"));
+
+        var note = new TaskNote
+        {
+            Content = request.Content,
+            Type = request.Type,
+            CreatedAt = DateTime.UtcNow
+        };
+
+        task.Notes.Add(note);
+        await taskRepo.UpdateAsync(task);
+
+        return Ok(ApiResponse<TaskNote>.Ok(note));
+    }
+}