MAUI templates are published as separate NuGet packages per .NET
major version (e.g., Microsoft.Maui.Templates.net9,
Microsoft.Maui.Templates.net10). Also add --nuget-source to avoid
the repo NuGet.config private feeds which don't host the templates.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

- Install all platform workloads needed for multi-TFM restore:
  Linux: maui-android; macOS: android+ios+maccatalyst; Windows: full maui
- Add --force to template install to handle pre-installed versions

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

win10-x64 is not a recognized RID in modern .NET SDK.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

…conflicts

When multiple .NET SDKs are installed (e.g., 9.0 + 10.0), the highest
SDK resolves workload manifests that may conflict with older TFMs.
Pin the SDK to match the target .NET version.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

…tance

Two critical fixes:
1. Create projects in $HOME/template-builds/ to avoid inheriting the
   repo's Directory.Build.props (which imports Microsoft.DotNet.Arcade.Sdk)
2. Restrict TargetFrameworks to only the platform being built, avoiding
   NETSDK1178 errors when not all platform workloads are installed

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

…kaged builds

- Add ValidateXcodeVersion=false for iOS/MacCatalyst (runner Xcode may
  differ from SDK-required version; we only measure size, not run apps)
- Add WindowsPackageType=MSIX for packaged builds (template defaults to
  None which conflicts with GenerateAppxPackageOnBuild=true)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

- Use iossimulator-arm64 RID (no code signing required for simulator)
- Use hyphens in project names (MSIX identity requires [-.A-Za-z0-9])
- Add dotnet-public NuGet feed for .NET 10 Mono runtime packages

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

…-dependent win

- iOS: Use dotnet build instead of publish (publish requires code signing)
  Copy .app from bin/ to publish/ for consistent measurement
- Shorten project names to stay within MSIX 50-char identity limit
- Move NuGet.config to parent dir (prevents bundling into macOS .app)
- Windows unpackaged non-AOT: framework-dependent (Mono.win-x64 unavailable)
- Restore ios-arm64 RID (build doesn't have simulator restriction)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

…on-AOT

iOS: Use dotnet publish with CodesignKey='-' (ad-hoc signing) and
BuildIpa=false to produce .app without Apple certificates.

Windows unpackaged non-AOT: Drop -r win-x64 flag which forces
self-contained and needs Mono.win-x64 (unavailable for .NET 10 GA).

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

With BuildIpa=false, dotnet publish doesn't copy the .app to -o path.
The .app stays in bin/Release/{framework}/{rid}/. Copy it to publish/
so measure-package-size.ps1 can find and measure it.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

…PR feedback

- Remove template installation (templates come with workload)
- Simplify workload install to 2 steps: maui-android on Linux, maui on macOS/Windows
- Extract 4 new scripts: prepare-matrix.ps1, create-project.ps1, build-and-publish.ps1, prepare-historical-data.ps1
- Fix project naming: use $template -replace '-', '' instead of if/else
- Remove nuget.org from NuGet.config (keep only dotnet-public)
- Change metrics artifact retention to 31 days
- Fix iOS compressed size: .app is not a compressed archive
- Fix default HistoricalMetricsPath in compare-and-alert.ps1
- Add null check for mauiVersion in generate-summary.ps1
- Fix IsAot ValidateSet in measure-package-size.ps1
- Add comment explaining immutable cache key pattern
- Remove maui_template_version workflow input
- Workflow YAML reduced from 671 to 236 lines

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

PowerShell variable names are case-insensitive, so $dotnetVersions
and $DotNetVersions (the [string] parameter) are the same variable.
Assigning an array to a [string]-typed variable coerces it back to a
space-separated string, causing all matrix entries to merge.

Fix: use [array]$versions and [array]$templateList as distinct names.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Add 'maui-sample' as a synthetic template name that maps to
'dotnet new maui --sample-content'. This tracks the full sample app
template which includes CommunityToolkit, SQLite, and Syncfusion
dependencies (~5 extra NuGet packages, ~60+ source files).

Matrix grows from 34 to 51 entries (17 new for maui-sample).

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>