diff --git a/docs/PROJECT-STRUCTURE.md b/docs/PROJECT-STRUCTURE.md
index dd2091e..fe6846e 100644
--- a/docs/PROJECT-STRUCTURE.md
+++ b/docs/PROJECT-STRUCTURE.md
@@ -28,6 +28,9 @@ S:\Game Hacking\Eushully\Himegari\           ← workspace root (three siblings)
 │
 └── age-reimpl/                              ← OUR WORK (everything we made lives here)
     │
+    ├── run-godot.ps1 / run-godot.cmd         tracked development launcher + Windows wrapper;
+    │                                          resolves Godot/game-root from parameters, environment,
+    │                                          PATH, and the conventional sibling install
     ├── tools/                               Python tooling (parser/disassembler + extractors + VM)
     │   ├── paths.py                           ★ central path anchor — the ONLY place that knows
     │   │                                        where the game / extracted / build dirs are. All
diff --git a/docs/tools-reference.md b/docs/tools-reference.md
index 7911de3..283badf 100644
--- a/docs/tools-reference.md
+++ b/docs/tools-reference.md
@@ -311,7 +311,7 @@ at 2.5M lines). All observe-only → parity preserved; all on `run`/`play`/`swee
   steps / 493k sleeps). Dumped when the scene ends or the window closes. e.g.
   `godot --path godot -- --scene SC0000 --boot --shot out/p1.png --trace-histogram out/hist.txt`.
 
-**Godot frontend** (`S:/Godot/Godot_v4.7…`; project = `godot/`). Toolchain: `godot --headless --path godot
+**Godot frontend** (Godot 4.7 .NET; project = `godot/`). Toolchain: `godot --headless --path godot
 --import` → `dotnet build godot/Himegari.csproj` → `godot [--headless] --path godot [-- <userargs>]`.
 Plays the real bytecode with call-script execution on (subroutines run live). The game root is selected
 before catalog loading: `--game-root <directory>` wins, otherwise the directory containing the running
@@ -350,9 +350,13 @@ input, or audible output; run those gates on a real Linux desktop.
 
 With the exported executable placed in an AGE install, a no-argument launch therefore uses that install
 and starts the persistent `SYSTEM4.BIN` root naturally. Direct development runs are hosted by the Godot
-editor executable, so pass `--game-root <install>` after Godot's `--` separator; the local
-`run-godot.ps1`/`.cmd` launchers pass the local script's directly configured `$gameRoot` value. Edit that
-one assignment when testing another installed game. Those launchers make the natural route explicit with
+editor executable, so pass `--game-root <install>` after Godot's `--` separator. The tracked
+`run-godot.ps1`/`.cmd` launchers resolve Godot and the game root without machine-specific tracked paths.
+Explicit `-GodotConsole`/`-GameRoot` values win, followed by `AGE_GODOT_CONSOLE`/`AGE_GAME_ROOT`; Godot
+then falls back to `godot4`, `godot`, or `godot-mono` on `PATH`, while the game root falls back to the
+conventional `../Himegari_Game` sibling only when it contains `SYS4INI.BIN`. `run-godot.ps1 -Doctor`
+prints the resolved repository, Godot, game-root, .NET, and Python prerequisites without building or
+launching. The launchers make the natural route explicit with
 `--scene SYSTEM4` and pass neither `--boot` nor SC0000 seeds. Examples below focus on their
 feature-specific arguments and assume the game root is already selected this way. `--headless` can't
 render texture ops (no GPU context) — run windowed for real scenes.
diff --git a/run-godot.cmd b/run-godot.cmd
new file mode 100644
index 0000000..8ef125e
--- /dev/null
+++ b/run-godot.cmd
@@ -0,0 +1,5 @@
+@echo off
+REM Default windowed launch follows SYSTEM4, exposes TITLE's shipped developer menu,
+REM and uses the accepted GPU retained renderer. Performance logging is opt-in again.
+REM -StartupDiagnostics overrides the developer-menu flag for a native-faithful capture.
+powershell -NoProfile -ExecutionPolicy Bypass -File "%~dp0run-godot.ps1" -NativeDebugMenu %*
diff --git a/run-godot.ps1 b/run-godot.ps1
new file mode 100644
index 0000000..509f237
--- /dev/null
+++ b/run-godot.ps1
@@ -0,0 +1,184 @@
+# run-godot.ps1 -- build the C# and launch the Himegari Godot project (how we've been running it).
+#
+#   .\run-godot.ps1            build, then run the persistent SYSTEM4 root windowed
+#   .\run-godot.ps1 -SelfTest  build, then headless self-test (asserts the dialogue trace vs vm0)
+#   .\run-godot.ps1 -Import    also (re)import the project first (needed after adding assets)
+#   .\run-godot.ps1 -NoBuild   skip the dotnet build, just launch
+#   .\run-godot.ps1 -NativeDebugMenu  expose TITLE's unreachable shipped developer menu
+#   .\run-godot.ps1 -StartupDiagnostics  capture the natural TITLE -> Game Start -> SC0000 route
+#   .\run-godot.ps1 -PerfLog   write a timestamped frame/compositor CSV under build/perf
+#   .\run-godot.ps1 -SoftwareRenderer  use the retained software correctness oracle
+#   .\run-godot.ps1 -Doctor     resolve and print prerequisites without building or launching
+#
+# Uses the *console* Godot build so GD.Print / DRAW logs / the selftest result show in the terminal.
+# Resolution order is explicit parameter, AGE_* environment variable, then a portable fallback.
+param(
+    [string]$GodotConsole,
+    [string]$GameRoot,
+    [switch]$SelfTest,
+    [switch]$Import,
+    [switch]$NoBuild,
+    [switch]$NativeDebugMenu,
+    [switch]$StartupDiagnostics,
+    [switch]$PerfLog,
+    [switch]$SoftwareRenderer,
+    [switch]$Doctor
+)
+
+$ErrorActionPreference = 'Stop'
+$repo    = $PSScriptRoot                          # age-reimpl/
+$project = Join-Path $repo 'godot'
+$csproj  = Join-Path $project 'Himegari.csproj'
+
+function Resolve-ConfiguredFile {
+    param(
+        [string]$ExplicitValue,
+        [string]$EnvironmentValue,
+        [string[]]$PathCommands,
+        [string]$Description
+    )
+
+    $configured = if ($ExplicitValue) { $ExplicitValue } elseif ($EnvironmentValue) { $EnvironmentValue } else { $null }
+    if ($configured) {
+        if (-not (Test-Path -LiteralPath $configured -PathType Leaf)) {
+            throw "$Description not found: $configured"
+        }
+        return (Resolve-Path -LiteralPath $configured).Path
+    }
+
+    foreach ($commandName in $PathCommands) {
+        $command = Get-Command $commandName -CommandType Application -ErrorAction SilentlyContinue |
+                   Select-Object -First 1
+        if ($command) { return $command.Source }
+    }
+
+    throw "$Description not found. Pass -GodotConsole, set AGE_GODOT_CONSOLE, or add Godot to PATH."
+}
+
+function Resolve-ConfiguredGameRoot {
+    param(
+        [string]$ExplicitValue,
+        [string]$EnvironmentValue,
+        [string]$ConventionalValue
+    )
+
+    $configured = if ($ExplicitValue) {
+        $ExplicitValue
+    } elseif ($EnvironmentValue) {
+        $EnvironmentValue
+    } else {
+        $ConventionalValue
+    }
+    if (-not (Test-Path -LiteralPath $configured -PathType Container)) {
+        throw "Game root not found: $configured. Pass -GameRoot or set AGE_GAME_ROOT."
+    }
+    $resolved = (Resolve-Path -LiteralPath $configured).Path
+    if (-not (Test-Path -LiteralPath (Join-Path $resolved 'SYS4INI.BIN') -PathType Leaf)) {
+        throw "Game root does not contain SYS4INI.BIN: $resolved"
+    }
+    return $resolved
+}
+
+$godotArguments = @{
+    ExplicitValue = $GodotConsole
+    EnvironmentValue = $env:AGE_GODOT_CONSOLE
+    PathCommands = @('godot4', 'godot', 'godot-mono')
+    Description = 'Godot .NET console executable'
+}
+$godot = Resolve-ConfiguredFile @godotArguments
+$gameRootArguments = @{
+    ExplicitValue = $GameRoot
+    EnvironmentValue = $env:AGE_GAME_ROOT
+    ConventionalValue = Join-Path (Split-Path $repo -Parent) 'Himegari_Game'
+}
+$resolvedGameRoot = Resolve-ConfiguredGameRoot @gameRootArguments
+
+if ($Doctor) {
+    $dotnet = Get-Command dotnet -CommandType Application -ErrorAction SilentlyContinue |
+              Select-Object -First 1
+    $python = Get-Command py -CommandType Application -ErrorAction SilentlyContinue |
+              Select-Object -First 1
+    if (-not $dotnet) { throw '.NET SDK not found on PATH.' }
+    if (-not $python) { throw 'Python launcher py.exe not found on PATH.' }
+    Write-Host "Repository : $repo"
+    Write-Host "Godot      : $godot"
+    Write-Host "Game root  : $resolvedGameRoot"
+    Write-Host "dotnet     : $($dotnet.Source)"
+    Write-Host "Python     : $($python.Source)"
+    exit 0
+}
+
+if ($SelfTest -and $StartupDiagnostics) {
+    throw '-SelfTest and -StartupDiagnostics are mutually exclusive.'
+}
+
+$diagnosticFiles = @()
+if ($StartupDiagnostics) {
+    $diagnosticDir = Join-Path $repo 'build\validation\title-newgame'
+    New-Item -ItemType Directory -Force -Path $diagnosticDir | Out-Null
+    $diagnosticFiles = @(
+        (Join-Path $diagnosticDir 'godot.log'),
+        (Join-Path $diagnosticDir 'timeline.jsonl'),
+        (Join-Path $diagnosticDir 'histogram.txt'),
+        (Join-Path $diagnosticDir 'page-map.jsonl')
+    )
+}
+
+$perfLogFile = $null
+if ($PerfLog -and -not $SelfTest) {
+    $perfLogDir = Join-Path $repo 'build\perf'
+    New-Item -ItemType Directory -Force -Path $perfLogDir | Out-Null
+    $perfLogFile = Join-Path $perfLogDir ("run-{0}.csv" -f (Get-Date -Format 'yyyyMMdd-HHmmss-fff'))
+}
+
+if (-not $NoBuild) {
+    Write-Host "==> dotnet build $csproj" -ForegroundColor Cyan
+    dotnet build $csproj -c Debug --nologo -v q
+    if ($LASTEXITCODE -ne 0) { throw "build failed" }
+}
+
+if ($Import) {
+    Write-Host "==> importing project" -ForegroundColor Cyan
+    & $godot --headless --path $project --import
+}
+
+if ($SelfTest) {
+    Write-Host "==> headless self-test" -ForegroundColor Cyan
+    & $godot --headless --path $project -- --selftest --game-root $resolvedGameRoot
+} else {
+    # SYSTEM4 owns the real initializer/title/New Game chain. Do not add --boot or SC0000
+    # seeds here: those belong only to explicit direct-scene diagnostics.
+    Write-Host "==> launching windowed from SYSTEM4" -ForegroundColor Cyan
+    $userArgs = @('--scene', 'SYSTEM4', '--game-root', $resolvedGameRoot)
+    if ($perfLogFile) {
+        Write-Host "==> performance log: $perfLogFile" -ForegroundColor Cyan
+        $userArgs += @('--perf-log', $perfLogFile)
+    }
+    if ($SoftwareRenderer) { $userArgs += @('--render-backend', 'software') }
+    if ($NativeDebugMenu -and -not $StartupDiagnostics) { $userArgs += '--native-debug-menu' }
+    if ($StartupDiagnostics) {
+        Write-Host "==> startup diagnostics enabled (native exit semantics)" -ForegroundColor Cyan
+        $userArgs += @(
+            '--timeline-log', $diagnosticFiles[1],
+            '--trace-histogram', $diagnosticFiles[2],
+            '--page-map', $diagnosticFiles[3]
+        )
+        & $godot --log-file $diagnosticFiles[0] --path $project -- @userArgs
+    } else {
+        & $godot --path $project -- @userArgs
+    }
+}
+
+$godotExitCode = $LASTEXITCODE
+if ($StartupDiagnostics) {
+    Write-Host "==> startup diagnostic artifacts" -ForegroundColor Cyan
+    foreach ($file in $diagnosticFiles) {
+        if (Test-Path -LiteralPath $file) {
+            $length = (Get-Item -LiteralPath $file).Length
+            Write-Host ("    {0} ({1:N0} bytes)" -f $file, $length)
+        } else {
+            Write-Warning "diagnostic artifact was not written: $file"
+        }
+    }
+}
+if ($godotExitCode -ne 0) { exit $godotExitCode }