Merge branch 'phase/49-skip-stale-build'

Co-authored-by: Cursor <cursoragent@cursor.com>

AGENTS.md

@@ -49,12 +49,14 @@ npm --prefix src/HSchool.Client run build
 dotnet run --project src/HSchool.AppHost
 ```
 
-`run-aspire.cmd` is the same command for Windows users who want a double-clickable entry point —
+`run-aspire.cmd` is the Windows entry point: it skips MSBuild when AppHost and Server dlls are
-keep the two in sync if the AppHost path ever moves.
+newer than C# / csproj / props. Pass `--rebuild` to force a build. Keep the script in sync with
+`tools/apphost-uptodate.ps1` if the AppHost path ever moves.
 
-`dotnet run --project src/HSchool.AppHost` starts the server *and* the Vite dev server and opens
+`dotnet run --project src/HSchool.AppHost` still compiles every time — that is for a dirty tree,
-the Aspire dashboard. The Vite port is assigned per run (`npm run dev -- --port <random>`), so read
+not a fast relaunch. It starts the server *and* the Vite dev server and opens the Aspire
-the client URL off the dashboard instead of assuming 5173.
+dashboard. The Vite port is assigned per run (`npm run dev -- --port <random>`), so read the
+client URL off the dashboard instead of assuming 5173.
 
 Do not start a dev server with a bare `npm run dev` when you meant to run the whole app — the
 client only finds the backend through the Aspire-injected `SERVER_HTTP` environment variable, or
@@ -131,6 +133,8 @@ say so explicitly in the change description.
   is empty. Reset deletes through the API, which deletes the save files. Headless AppHost
   sets `HSchool:AllowSaveReload` so tests can `POST /api/dev/reload-schools` without killing
   the shared fixture.
+- Launch-script up-to-date checks belong in `tests/HSchool.AppHost.Tests` and must not use
+  `AppHostFixture`. Keep `LaunchBuildStamp` and `tools/apphost-uptodate.ps1` in sync.
 - Screen logic is covered in Vitest under happy-dom (`ui/*.test.ts`): people filters and the
   pager, the create dialog (core stays on, map reset, submit busy), planner rejection text, and
   the payroll-cap message. Layout and styles are still verified by running the app. Dictionaries
@@ -185,3 +189,7 @@ say so explicitly in the change description.
   the clock does not advance, so occupancy (often empty) and lesson labels from the timetable
   keep going out. Opening sends one extra snapshot. A test that waits for *people* on pause
   will hang; a test that waits for a lesson label will not.
+- **`dotnet run` on the AppHost always evaluates MSBuild**, even when nothing changed.
+  `run-aspire.cmd` skips that with `--no-build` when AppHost and Server dlls are newer than
+  C# / csproj / props. `--rebuild` forces a build. Bare `dotnet run --project src/HSchool.AppHost`
+  still compiles.

README.md

@@ -32,7 +32,8 @@ dotnet run --project src/HSchool.AppHost
 
 On Windows `run-aspire.cmd` does the same and can be double-clicked; it checks that the .NET SDK
 and Node are on PATH first and passes any arguments through
-(`run-aspire.cmd --launch-profile http`).
+(`run-aspire.cmd --launch-profile http`). A second launch with no C# changes skips MSBuild;
+`run-aspire.cmd --rebuild` forces a build.
 
 The Aspire dashboard opens with two resources: `server` (ASP.NET Core) and `client` (Vite dev
 server). Aspire assigns the client a random port on every run, so take its URL from the dashboard

docs/design/off-queue.md

@@ -1,7 +1,7 @@
 # Вне очереди
 
 Задачи, которых нет в нумерованных срезах. Сюда не дописывают срез 9 и не заводят срез 10:
-это склейка уже живых систем, после любой фазы школа целая.
+склейка уже живых систем и мелкий DX. После любой фазы школа целая.
 
 Люди: [`people.md`](people.md). Штат: [`staffing.md`](staffing.md). Расписание:
 [`schedule.md`](schedule.md). Присутствие: [`ai.md`](ai.md). Одежда и климат:
@@ -88,3 +88,33 @@
 | Тепло | Рядом с голодом, произведение двух `NeedFactor` |
 | Учебник | Только сумка, не шкафчик и не дом; ваниль ×0.5 |
 | Погода на дорогу | Минуты в `BehaviorDef`; лога нет |
+
+## Пропуск сборки при запуске
+
+### Зачем
+
+`run-aspire.cmd` каждый раз вызывает `dotnet run`, а тот — MSBuild графа Aspire, даже когда
+исходники не менялись. Повторный запуск после Ctrl+C стоит десятки секунд впустую: SDK
+пересчитывает хост, хотя dll на месте.
+
+### Было / Стало / Почему
+
+**Было.** Скрипт всегда `dotnet run --project src/HSchool.AppHost`. Аргументы проходили насквозь.
+
+**Стало.** Если `HSchool.AppHost.dll` и `HSchool.Server.dll` новее входов (C#, csproj, props,
+`global.json`), скрипт делает `dotnet run --no-build`. Иначе — `dotnet build`, потом `--no-build`.
+`--rebuild` собирает всегда. Конфигурация (`-c` / `--configuration`) выбирает, какие dll сравнивать;
+по умолчанию Debug, как у `dotnet run`.
+
+**Почему.** Инкрементальный MSBuild всё равно оценивает Aspire SDK. `--no-build` это пропускает.
+Клиентский TypeScript и JSONC модов не входы: Vite и каталог читают диск (`ContentRoot`), а не
+`bin`. Тестовые проекты AppHost не ссылается — их правки запуск не пересобирают.
+
+Правила «устарел ли билд» живут в `tools/apphost-uptodate.ps1` (то, что вызывает `.cmd`) и в
+`LaunchBuildStamp` (то, что проверяют тесты). Менять надо оба.
+
+### Что не входит
+
+Голый `dotnet run --project src/HSchool.AppHost` по-прежнему собирает — так удобнее агентам с
+грязным деревом. Linux-обёртки нет: точка входа Windows — `.cmd`. Протокол, HTTP и сейв не
+трогаем.

docs/phases/49-skip-stale-build.md

@@ -0,0 +1,45 @@
+# Фаза 49. Пропуск сборки при запуске
+
+## Зависимости
+
+Нет. Скрипт запуска уже есть.
+
+## Зачем
+
+Повторный `run-aspire.cmd` без правок в C# не должен ждать MSBuild графа Aspire. Сборка нужна
+только когда входы новее dll или когда просили `--rebuild`.
+
+## Задачи
+
+- [x] `tools/apphost-uptodate.ps1`: выход 0, если AppHost и Server dll новее входов; 1 — если
+      нет dll или вход новее. Входы: `*.cs` / `*.csproj` / `*.props` под `src/` без `bin` /
+      `obj` / `node_modules`, плюс `global.json`, `Directory.Build.props`, `Directory.Packages.props`.
+      TypeScript и JSONC не входы
+- [x] `run-aspire.cmd` вызывает проверку; при 0 — `dotnet run --no-build` и пишет, что сборка
+      пропущена; иначе `dotnet build`, затем `--no-build`. `--rebuild` всегда собирает и не
+      уходит в AppHost. `-c` / `--configuration` выбирают папку `bin`
+- [x] `LaunchBuildStamp` с теми же правилами, тесты на временных папках без `AppHostFixture`
+- [x] `AGENTS.md` и `README.md`: повторный запуск без правок — `run-aspire.cmd`; голый
+      `dotnet run` по-прежнему собирает. `--rebuild` упомянут
+
+## Тесты, без которых фаза не закрыта
+
+- [x] Нет dll — нужно собирать
+- [x] Dll новее всех входов — пропускать
+- [x] `.cs` новее dll — собирать
+- [x] `.ts` или `.jsonc` новее dll — пропускать
+- [x] Файл в `bin` / `obj` / `node_modules` не считается входом
+- [x] `Directory.Packages.props` новее dll — собирать
+- [x] `-c Release` смотрит `bin/Release`, а не Debug
+
+## Критерий готовности
+
+- Два запуска `run-aspire.cmd` подряд без правок: второй пишет, что сборка пропущена, и
+  стартует AppHost
+- `run-aspire.cmd --rebuild` собирает даже со свежими dll
+- `dotnet test` проходит; тесты штампа не поднимают хост
+
+## Стоп
+
+Не менять Aspire-граф, протокол, сейвы. Не вшивать `--no-build` в голый `dotnet run`. Не
+сканировать `tests/` и не считать клиентский TS поводом пересобрать сервер.

docs/phases/README.md

@@ -227,12 +227,14 @@
 
 Дизайн: [`../design/off-queue.md`](../design/off-queue.md).
 
-Склейка уже живых систем, не новый кусок игры. Номера не спорят со срезом 10. После каждой
+Склейка уже живых систем и мелкий DX, не новый кусок игры. Номера не спорят со срезом 10.
-фазы школа целая. 50–52 стоят на 48; 53 — на 18 и 32, можно параллельно с 48.
+После каждой игровой фазы школа целая. 50–52 стоят на 48; 53 — на 18 и 32, можно параллельно
+с 48. 49 от них не зависит.
 
 | Фаза | Статус | Зачем |
 | --- | --- | --- |
 | [48. Учитель в кабинете](48-lesson-teacher-present.md) | ✅ | Нет учителя на месте — нет роста навыка |
+| [49. Пропуск сборки при запуске](49-skip-stale-build.md) | ✅ | `run-aspire.cmd` не гоняет MSBuild, если dll свежие |
 | [50. Навык учителя](50-teacher-skill-gain.md) | 🔄 | Соискатель 78 учит лучше, чем 41 |
 | [51. Тепло на уроке](51-warmth-lesson.md) | ⬜ | Замёрзший учится хуже, как голодный |
 | [52. Учебник на уроке](52-textbook-lesson.md) | ⬜ | Нет в сумке — половинный рост |

run-aspire.cmd

@@ -1,8 +1,10 @@
 @echo off
-setlocal
+setlocal EnableDelayedExpansion
 
 rem Starts the whole app: game server, Vite client and the Aspire dashboard.
-rem Arguments are passed through, e.g.  run-aspire.cmd --launch-profile http
+rem Skips MSBuild when AppHost and Server dlls are newer than C# / csproj / props.
+rem   run-aspire.cmd --launch-profile http
+rem   run-aspire.cmd --rebuild
 
 cd /d "%~dp0"
 
@@ -21,19 +23,70 @@ if errorlevel 1 (
     echo.
 )
 
+set "CONFIG=Debug"
+set "REBUILD=0"
+set "ARGS="
+
+:parse
+if "%~1"=="" goto parsed
+if /I "%~1"=="--rebuild" (
+    set "REBUILD=1"
+    shift
+    goto parse
+)
+if /I "%~1"=="-c" if not "%~2"=="" set "CONFIG=%~2"
+if /I "%~1"=="--configuration" if not "%~2"=="" set "CONFIG=%~2"
+set "ARGS=!ARGS! %1"
+shift
+goto parse
+
+:parsed
+
+if "%REBUILD%"=="1" (
+    echo [run-aspire] --rebuild: building.
+    goto build
+)
+
+where powershell >nul 2>&1
+if errorlevel 1 (
+    echo [run-aspire] PowerShell not found, building.
+    goto build
+)
+
+powershell -NoProfile -ExecutionPolicy Bypass -File "%~dp0tools\apphost-uptodate.ps1" -RepoRoot "%CD%" -Configuration "%CONFIG%"
+if errorlevel 1 (
+    echo [run-aspire] sources changed or binaries missing, building.
+    goto build
+)
+
+echo [run-aspire] binaries are up to date, skipping build.
+goto run
+
+:build
+echo.
+dotnet build "src\HSchool.AppHost\HSchool.AppHost.csproj" -c "%CONFIG%"
+if errorlevel 1 (
+    echo.
+    echo [run-aspire] build failed.
+    call :maybe_pause
+    exit /b 1
+)
+echo.
+
+:run
 echo [run-aspire] Starting the Aspire AppHost. Press Ctrl+C to shut everything down.
 echo.
 
-dotnet run --project "src\HSchool.AppHost\HSchool.AppHost.csproj" %*
+dotnet run --project "src\HSchool.AppHost\HSchool.AppHost.csproj" --no-build --no-restore !ARGS!
-set "EXITCODE=%ERRORLEVEL%"
+set "EXITCODE=!ERRORLEVEL!"
 
-if not "%EXITCODE%"=="0" (
+if not "!EXITCODE!"=="0" (
     echo.
-    echo [run-aspire] AppHost exited with code %EXITCODE%.
+    echo [run-aspire] AppHost exited with code !EXITCODE!.
 )
 
 call :maybe_pause
-endlocal & exit /b %EXITCODE%
+exit /b !EXITCODE!
 
 rem Keeps the window open when the file was double-clicked from Explorer.
 :maybe_pause

tests/HSchool.AppHost.Tests/LaunchBuildStamp.cs

@@ -0,0 +1,105 @@
+namespace HSchool.AppHost.Tests;
+
+/// <summary>
+/// Same rules as <c>tools/apphost-uptodate.ps1</c>. Keep the two in sync.
+/// </summary>
+internal static class LaunchBuildStamp
+{
+    public const string TargetFramework = "net10.0";
+
+    public static readonly string[] InputExtensions = [".cs", ".csproj", ".props"];
+
+    public static readonly string[] NamedInputs =
+    [
+        "global.json",
+        "Directory.Build.props",
+        "Directory.Packages.props",
+    ];
+
+    public static readonly string[] SkipDirectoryNames = ["bin", "obj", "node_modules"];
+
+    public static readonly string[] OutputProjects = ["HSchool.AppHost", "HSchool.Server"];
+
+    public static bool NeedsBuild(string repoRoot, string configuration = "Debug")
+    {
+        ArgumentException.ThrowIfNullOrWhiteSpace(repoRoot);
+        ArgumentException.ThrowIfNullOrWhiteSpace(configuration);
+
+        DateTime? oldestOutput = null;
+        foreach (var project in OutputProjects)
+        {
+            var dll = Path.Combine(
+                repoRoot,
+                "src",
+                project,
+                "bin",
+                configuration,
+                TargetFramework,
+                project + ".dll");
+            if (!File.Exists(dll))
+            {
+                return true;
+            }
+
+            var written = File.GetLastWriteTimeUtc(dll);
+            if (oldestOutput is null || written < oldestOutput.Value)
+            {
+                oldestOutput = written;
+            }
+        }
+
+        if (oldestOutput is null)
+        {
+            return true;
+        }
+
+        var cutoff = oldestOutput.Value;
+
+        foreach (var name in NamedInputs)
+        {
+            var path = Path.Combine(repoRoot, name);
+            if (File.Exists(path) && File.GetLastWriteTimeUtc(path) > cutoff)
+            {
+                return true;
+            }
+        }
+
+        var src = Path.Combine(repoRoot, "src");
+        return !Directory.Exists(src) || HasNewerInput(src, cutoff);
+    }
+
+    private static bool HasNewerInput(string directory, DateTime cutoff)
+    {
+        foreach (var file in Directory.EnumerateFiles(directory))
+        {
+            if (!IsInputExtension(Path.GetExtension(file)))
+            {
+                continue;
+            }
+
+            if (File.GetLastWriteTimeUtc(file) > cutoff)
+            {
+                return true;
+            }
+        }
+
+        foreach (var child in Directory.EnumerateDirectories(directory))
+        {
+            var leaf = Path.GetFileName(child);
+            if (SkipDirectoryNames.Contains(leaf, StringComparer.OrdinalIgnoreCase))
+            {
+                continue;
+            }
+
+            if (HasNewerInput(child, cutoff))
+            {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    private static bool IsInputExtension(string extension) =>
+        InputExtensions.Contains(extension, StringComparer.OrdinalIgnoreCase);
+}

tests/HSchool.AppHost.Tests/LaunchBuildStampTests.cs

@@ -0,0 +1,157 @@
+namespace HSchool.AppHost.Tests;
+
+public class LaunchBuildStampTests
+{
+    private static readonly DateTime Inputs = new(2026, 1, 1, 12, 0, 0, DateTimeKind.Utc);
+    private static readonly DateTime Outputs = new(2026, 1, 1, 12, 5, 0, DateTimeKind.Utc);
+    private static readonly DateTime Newer = new(2026, 1, 1, 12, 10, 0, DateTimeKind.Utc);
+
+    [Fact]
+    public void MissingDll_NeedsBuild()
+    {
+        using var repo = FreshRepo();
+        File.Delete(repo.Dll("HSchool.Server"));
+
+        Assert.True(LaunchBuildStamp.NeedsBuild(repo.Root));
+    }
+
+    [Fact]
+    public void FreshDlls_SkipBuild()
+    {
+        using var repo = FreshRepo();
+
+        Assert.False(LaunchBuildStamp.NeedsBuild(repo.Root));
+    }
+
+    [Fact]
+    public void NewerCs_NeedsBuild()
+    {
+        using var repo = FreshRepo();
+        repo.Touch("src/HSchool.Server/Program.cs", Newer);
+
+        Assert.True(LaunchBuildStamp.NeedsBuild(repo.Root));
+    }
+
+    [Fact]
+    public void NewerTsOrJsonc_SkipBuild()
+    {
+        using var repo = FreshRepo();
+        repo.Write("src/HSchool.Client/src/main.ts", "export {}");
+        repo.Write("src/HSchool.Server/mods/core/defs/foo.jsonc", "{}");
+        repo.Touch("src/HSchool.Client/src/main.ts", Newer);
+        repo.Touch("src/HSchool.Server/mods/core/defs/foo.jsonc", Newer);
+
+        Assert.False(LaunchBuildStamp.NeedsBuild(repo.Root));
+    }
+
+    [Fact]
+    public void FilesInBinObjNodeModules_AreNotInputs()
+    {
+        using var repo = FreshRepo();
+        repo.Write("src/HSchool.Server/bin/Debug/net10.0/Generated.cs", "class G {}");
+        repo.Write("src/HSchool.Server/obj/Debug/net10.0/Generated.cs", "class G {}");
+        repo.Write("src/HSchool.Client/node_modules/pkg/index.cs", "class N {}");
+        repo.Touch("src/HSchool.Server/bin/Debug/net10.0/Generated.cs", Newer);
+        repo.Touch("src/HSchool.Server/obj/Debug/net10.0/Generated.cs", Newer);
+        repo.Touch("src/HSchool.Client/node_modules/pkg/index.cs", Newer);
+
+        Assert.False(LaunchBuildStamp.NeedsBuild(repo.Root));
+    }
+
+    [Fact]
+    public void NewerDirectoryPackagesProps_NeedsBuild()
+    {
+        using var repo = FreshRepo();
+        repo.Touch("Directory.Packages.props", Newer);
+
+        Assert.True(LaunchBuildStamp.NeedsBuild(repo.Root));
+    }
+
+    [Fact]
+    public void ReleaseLooksAtReleaseBin()
+    {
+        using var repo = FreshRepo();
+
+        Assert.False(LaunchBuildStamp.NeedsBuild(repo.Root, "Debug"));
+        Assert.True(LaunchBuildStamp.NeedsBuild(repo.Root, "Release"));
+
+        repo.WriteDll("HSchool.AppHost", "Release");
+        repo.WriteDll("HSchool.Server", "Release");
+        repo.TouchDlls("Release", Outputs);
+
+        Assert.False(LaunchBuildStamp.NeedsBuild(repo.Root, "Release"));
+    }
+
+    private static TempRepo FreshRepo()
+    {
+        var repo = new TempRepo();
+        repo.Write("global.json", "{}");
+        repo.Write("Directory.Build.props", "<Project />");
+        repo.Write("Directory.Packages.props", "<Project />");
+        repo.Write("src/HSchool.AppHost/AppHost.cs", "class A {}");
+        repo.Write("src/HSchool.AppHost/HSchool.AppHost.csproj", "<Project />");
+        repo.Write("src/HSchool.Server/Program.cs", "class S {}");
+        repo.Write("src/HSchool.Server/HSchool.Server.csproj", "<Project />");
+        repo.WriteDll("HSchool.AppHost");
+        repo.WriteDll("HSchool.Server");
+        repo.Touch("global.json", Inputs);
+        repo.Touch("Directory.Build.props", Inputs);
+        repo.Touch("Directory.Packages.props", Inputs);
+        repo.Touch("src/HSchool.AppHost/AppHost.cs", Inputs);
+        repo.Touch("src/HSchool.AppHost/HSchool.AppHost.csproj", Inputs);
+        repo.Touch("src/HSchool.Server/Program.cs", Inputs);
+        repo.Touch("src/HSchool.Server/HSchool.Server.csproj", Inputs);
+        repo.TouchDlls("Debug", Outputs);
+        return repo;
+    }
+
+    private sealed class TempRepo : IDisposable
+    {
+        public string Root { get; } = Path.Combine(Path.GetTempPath(), "h-school-stamp-" + Guid.NewGuid().ToString("N"));
+
+        public TempRepo() => Directory.CreateDirectory(Root);
+
+        public string Write(string relative, string contents)
+        {
+            var path = PathUnder(relative);
+            var dir = Path.GetDirectoryName(path);
+            if (dir is not null)
+            {
+                Directory.CreateDirectory(dir);
+            }
+
+            File.WriteAllText(path, contents);
+            return path;
+        }
+
+        public string WriteDll(string project, string configuration = "Debug") =>
+            Write($"src/{project}/bin/{configuration}/{LaunchBuildStamp.TargetFramework}/{project}.dll", "dll");
+
+        public string Dll(string project, string configuration = "Debug") =>
+            PathUnder($"src/{project}/bin/{configuration}/{LaunchBuildStamp.TargetFramework}/{project}.dll");
+
+        public void Touch(string relative, DateTime utc) => File.SetLastWriteTimeUtc(PathUnder(relative), utc);
+
+        public void TouchDlls(string configuration, DateTime utc)
+        {
+            foreach (var project in LaunchBuildStamp.OutputProjects)
+            {
+                Touch($"src/{project}/bin/{configuration}/{LaunchBuildStamp.TargetFramework}/{project}.dll", utc);
+            }
+        }
+
+        public void Dispose()
+        {
+            try
+            {
+                Directory.Delete(Root, recursive: true);
+            }
+            catch (IOException)
+            {
+            }
+        }
+
+        private string PathUnder(string relative) =>
+            Path.Combine(Root, relative.Replace('/', Path.DirectorySeparatorChar));
+    }
+}

tools/apphost-uptodate.ps1

@@ -0,0 +1,80 @@
+# Same rules as tests/HSchool.AppHost.Tests/LaunchBuildStamp.cs. Keep the two in sync.
+# Exit 0: AppHost and Server dlls are newer than inputs. Exit 1: need a build.
+param(
+    [Parameter(Mandatory = $true)]
+    [string] $RepoRoot,
+    [string] $Configuration = "Debug"
+)
+
+$ErrorActionPreference = "Stop"
+$tfm = "net10.0"
+$outputs = @(
+    Join-Path $RepoRoot "src\HSchool.AppHost\bin\$Configuration\$tfm\HSchool.AppHost.dll"
+    Join-Path $RepoRoot "src\HSchool.Server\bin\$Configuration\$tfm\HSchool.Server.dll"
+)
+
+foreach ($dll in $outputs) {
+    if (-not (Test-Path -LiteralPath $dll)) {
+        exit 1
+    }
+}
+
+$oldest = $null
+foreach ($dll in $outputs) {
+    $written = (Get-Item -LiteralPath $dll).LastWriteTimeUtc
+    if ($null -eq $oldest -or $written -lt $oldest) {
+        $oldest = $written
+    }
+}
+
+$named = @(
+    "global.json"
+    "Directory.Build.props"
+    "Directory.Packages.props"
+)
+foreach ($name in $named) {
+    $path = Join-Path $RepoRoot $name
+    if ((Test-Path -LiteralPath $path) -and (Get-Item -LiteralPath $path).LastWriteTimeUtc -gt $oldest) {
+        exit 1
+    }
+}
+
+$src = Join-Path $RepoRoot "src"
+if (-not (Test-Path -LiteralPath $src)) {
+    exit 1
+}
+
+$extensions = @{
+    ".cs" = $true
+    ".csproj" = $true
+    ".props" = $true
+}
+$skip = @{
+    "bin" = $true
+    "obj" = $true
+    "node_modules" = $true
+}
+
+$stack = New-Object System.Collections.Stack
+$stack.Push($src)
+while ($stack.Count -gt 0) {
+    $dir = [string]$stack.Pop()
+    foreach ($child in [System.IO.Directory]::EnumerateDirectories($dir)) {
+        $leaf = Split-Path -Path $child -Leaf
+        if ($skip.ContainsKey($leaf.ToLowerInvariant())) {
+            continue
+        }
+        $stack.Push($child)
+    }
+    foreach ($file in [System.IO.Directory]::EnumerateFiles($dir)) {
+        $ext = [System.IO.Path]::GetExtension($file).ToLowerInvariant()
+        if (-not $extensions.ContainsKey($ext)) {
+            continue
+        }
+        if ((Get-Item -LiteralPath $file).LastWriteTimeUtc -gt $oldest) {
+            exit 1
+        }
+    }
+}
+
+exit 0