feat: support Android and iOS simulator startup profiling in maui profile

MauiLabs.slnx

@@ -16,6 +16,7 @@
   <Folder Name="/src/Cli/">
     <Project Path="src/Cli/Microsoft.Maui.Cli.UnitTests/Microsoft.Maui.Cli.UnitTests.csproj" />
     <Project Path="src/Cli/Microsoft.Maui.Cli/Microsoft.Maui.Cli.csproj" />
+    <Project Path="src/Cli/Microsoft.Maui.StartupProfiling/Microsoft.Maui.StartupProfiling.csproj" />
   </Folder>
   <Folder Name="/src/DevFlow/">
     <Project Path="src/DevFlow/Microsoft.Maui.DevFlow.Agent.Core/Microsoft.Maui.DevFlow.Agent.Core.csproj" />

src/Cli/Cli.slnf

@@ -4,6 +4,7 @@
     "projects": [
       "src\\Cli\\Microsoft.Maui.Cli\\Microsoft.Maui.Cli.csproj",
       "src\\Cli\\Microsoft.Maui.Cli.UnitTests\\Microsoft.Maui.Cli.UnitTests.csproj",
+      "src\\Cli\\Microsoft.Maui.StartupProfiling\\Microsoft.Maui.StartupProfiling.csproj",
       "src\\DevFlow\\Microsoft.Maui.DevFlow.Driver\\Microsoft.Maui.DevFlow.Driver.csproj"
     ]
   }

src/Cli/Microsoft.Maui.Cli.UnitTests/OutputFormatterTests.cs

@@ -1,9 +1,11 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
+using System.Diagnostics;
 using System.Text;
 using System.Text.Json.Nodes;
 using Microsoft.Maui.Cli.Errors;
+using Microsoft.Maui.Cli.Commands;
 using Microsoft.Maui.Cli.Models;
 using Microsoft.Maui.Cli.Output;
 using Spectre.Console;
@@ -109,6 +111,27 @@ private static (SpectreOutputFormatter formatter, TestConsole console) CreateTes
 		return (formatter, console);
 	}
 
+	private static Process StartTestProcessThatWritesStderr()
+	{
+		var startInfo = OperatingSystem.IsWindows()
+			? new ProcessStartInfo("cmd", "/c echo boom 1>&2")
+			: new ProcessStartInfo("/bin/bash", "-lc \"echo boom >&2\"");
+
+		startInfo.UseShellExecute = false;
+		startInfo.RedirectStandardOutput = true;
+		startInfo.RedirectStandardError = true;
+		startInfo.RedirectStandardInput = true;
+		startInfo.CreateNoWindow = true;
+
+		var process = new Process
+		{
+			StartInfo = startInfo
+		};
+
+		Assert.True(process.Start());
+		return process;
+	}
+
 	[Fact]
 	public void SpectreOutputFormatter_WriteSuccess_OutputsMessage()
 	{
@@ -145,6 +168,44 @@ public void SpectreOutputFormatter_WriteInfo_OutputsMessage()
 		Assert.Contains("ℹ", output);
 	}
 
+	[Fact]
+	public void Program_HandleCommandException_ForCancellation_WritesCancelledInsteadOfError()
+	{
+		var (formatter, console) = CreateTestFormatter();
+
+		var exitCode = Program.HandleCommandException(formatter, new OperationCanceledException());
+
+		Assert.Equal(130, exitCode);
+		Assert.Contains("Cancelled.", console.Output);
+		Assert.DoesNotContain("Error", console.Output);
+	}
+
+	[Fact]
+	public async Task MonitoredProcess_Attach_DoesNotEchoStderr_WhenNotVerbose()
+	{
+		var (formatter, console) = CreateTestFormatter();
+		using var process = StartTestProcessThatWritesStderr();
+		using var monitored = MonitoredProcess.Attach(process, formatter, useJson: false, verbose: false, prefix: "trace", CancellationToken.None);
+
+		await monitored.WaitForExitAsync();
+
+		Assert.DoesNotContain("boom", console.Output);
+		Assert.Contains("boom", monitored.StandardError.ToString());
+	}
+
+	[Fact]
+	public async Task MonitoredProcess_Attach_EchoesStderr_AsProgress_WhenVerbose()
+	{
+		var (formatter, console) = CreateTestFormatter(verbose: true);
+		using var process = StartTestProcessThatWritesStderr();
+		using var monitored = MonitoredProcess.Attach(process, formatter, useJson: false, verbose: true, prefix: "trace", CancellationToken.None);
+
+		await monitored.WaitForExitAsync();
+
+		Assert.Contains("[trace:stderr] boom", console.Output);
+		Assert.DoesNotContain("⚠", console.Output);
+	}
+
 	[Fact]
 	public void SpectreOutputFormatter_WriteError_IncludesErrorCode()
 	{
@@ -248,4 +309,36 @@ public void SpectreOutputFormatter_WriteTable_FormatsColumns()
 		Assert.Contains("Apple", output);
 		Assert.Contains("Carrot", output);
 	}
+
+	[Theory]
+	[InlineData(0.4, "0.4s")]
+	[InlineData(5.4, "5.4s")]
+	[InlineData(36, "36.0s")]
+	[InlineData(62.3, "1:02.3s")]
+	public void SpectreOutputFormatter_FormatElapsed_UsesReadableDurations(double seconds, string expected)
+	{
+		var actual = SpectreOutputFormatter.FormatElapsed(TimeSpan.FromSeconds(seconds));
+		Assert.Equal(expected, actual);
+	}
+
+	[Fact]
+	public void SpectreOutputFormatter_FormatTimedStatusMarkup_AppendsElapsedToFirstLine()
+	{
+		var actual = SpectreOutputFormatter.FormatTimedStatusMarkup(
+			"Publishing dotnet-pgo...\n[grey]  Restored packages[/]",
+			TimeSpan.FromSeconds(36));
+
+		Assert.StartsWith("Publishing dotnet-pgo... [grey](36.0s)[/]", actual);
+		Assert.Contains("\n[grey]  Restored packages[/]", actual);
+	}
+
+	[Fact]
+	public void SpectreOutputFormatter_FormatCompletedStatusMessage_StripsTrailingEllipsis()
+	{
+		var actual = SpectreOutputFormatter.FormatCompletedStatusMessage(
+			"Building the app...",
+			TimeSpan.FromSeconds(36));
+
+		Assert.Equal("Building the app (36.0s)", actual);
+	}
 }