Add Godot project shell

SLICE1.MD

@@ -15,10 +15,10 @@ The observable result is small but concrete: from `D:\Code\zfxaction26_1`, `dotn
 - [x] (2026-04-21 16:36Z) Read repository rules, Windows rules, `PLANS.md`, `CODE.md`, and current Godot project files.
 - [x] (2026-04-21 16:36Z) Verified that the Godot project currently lives in `godot/project.godot`, not at the repository root.
 - [x] (2026-04-21 16:36Z) Verified that `SideScrollerGame.sln` and `godot/SideScrollerGame.Godot.csproj` currently build with `dotnet build SideScrollerGame.sln` after the user's fixes.
-- [ ] Implement root scene, placeholder scene, smoke scene, input actions, and debug boot code.
+- [x] (2026-04-21 16:52Z) Implemented root scene, placeholder scene, smoke scene, input actions, and debug boot code.
-- [ ] Run formatting for touched C# files with `jb cleanupcode --build=False`.
+- [x] (2026-04-21 16:52Z) Ran formatting for touched C# files with `jb cleanupcode --build=False`.
-- [ ] Validate with .NET build, Godot solution build, and headless smoke boot.
+- [x] (2026-04-21 16:52Z) Validated with .NET build, Godot solution build, and headless smoke boot.
-- [ ] Commit the completed slice.
+- [x] (2026-04-21 16:52Z) Commit the completed slice.
 
 ## Surprises & Discoveries
 
@@ -31,6 +31,12 @@ The observable result is small but concrete: from `D:\Code\zfxaction26_1`, `dotn
 - Observation: Running `dotnet build SideScrollerGame.sln` and `dotnet build godot\SideScrollerGame.Godot.csproj` at the same time can race on the same Godot temp assembly.
   Evidence: the parallel build attempt failed with `CS2012: Cannot open ... SideScrollerGame.Godot.dll for writing`. A serial `dotnet build SideScrollerGame.sln` immediately afterward succeeded.
 
+- Observation: `godot/project.godot` had `project/assembly_name="SideScrollerGame"`, while the fixed C# project builds `SideScrollerGame.Godot.dll`.
+  Evidence: the first smoke boot did not instantiate C# scripts, and `.\godot --headless --path godot --quit` reported that `GameRoot.cs` and `DebugOverlay.cs` classes could not be found. Updating the Godot assembly name to `SideScrollerGame.Godot` fixed script loading.
+
+- Observation: Quoting the semicolon-separated `jb cleanupcode` file list made JetBrains treat the full list as one path.
+  Evidence: `jb cleanupcode --build=False "file1;file2;..."` exited with "No items were found to cleanup." Running `jb cleanupcode --build=False file1 file2 ...` formatted all touched C# files.
+
 ## Decision Log
 
 - Decision: Keep `godot/project.godot` as the canonical Godot project entrypoint for this slice.
@@ -49,9 +55,30 @@ The observable result is small but concrete: from `D:\Code\zfxaction26_1`, `dotn
   Rationale: Command-line boot modes make sandbox and smoke testing fast without editor interaction. Project setting fallback keeps editor boot predictable.
   Date/Author: 2026-04-21 / Codex.
 
+- Decision: Match `godot/project.godot`'s .NET assembly name to the existing C# project output, `SideScrollerGame.Godot`.
+  Rationale: Godot resolves attached C# scripts through the configured assembly name. The project already builds `SideScrollerGame.Godot.dll`, and changing the Godot setting avoids touching the user's fixed `.csproj`.
+  Date/Author: 2026-04-21 / Codex.
+
 ## Outcomes & Retrospective
 
-Not started. When this slice is completed, update this section with the exact files created, commands run, validation output, and any remaining risks.
+Implemented a bootable Godot project shell under `godot/`. Created the root scene, menu placeholder scene, smoke scene, debug boot settings reader, debug overlay, and smoke controller. Added project input actions and configured `res://scenes/bootstrap/GameRoot.tscn` as the main scene.
+
+Validation completed:
+
+    dotnet build SideScrollerGame.sln
+      Build succeeded.
+          0 Warning(s)
+          0 Error(s)
+
+    .\godot --headless --path godot --build-solutions --quit
+      Exited successfully.
+
+    .\godot --headless --path godot -- --debug-boot=smoke --seed=12345
+      Debug boot: Smoke
+      Seed: 12345
+      Smoke scene loaded
+
+Remaining risk: editor visual layout was not manually inspected in a window during this slice. The headless boot path and script loading are validated.
 
 ## Context and Orientation
 

godot/project.godot

@@ -11,9 +11,69 @@ config_version=5
 [application]
 
 config/name="SideScrollerGame"
+run/main_scene="res://scenes/bootstrap/GameRoot.tscn"
+run/debug_boot_mode="menu"
+run/debug_seed=1
 config/features=PackedStringArray("4.5", "C#", "Forward Plus")
 config/icon="res://icon.svg"
 
 [dotnet]
 
-project/assembly_name="SideScrollerGame"
+project/assembly_name="SideScrollerGame.Godot"
+
+[input]
+
+move_up={
+"deadzone": 0.5,
+"events": [Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":87,"physical_keycode":0,"key_label":0,"unicode":0,"location":0,"echo":false,"script":null)
+, Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":4194320,"physical_keycode":0,"key_label":0,"unicode":0,"location":0,"echo":false,"script":null)
+]
+}
+move_down={
+"deadzone": 0.5,
+"events": [Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":83,"physical_keycode":0,"key_label":0,"unicode":0,"location":0,"echo":false,"script":null)
+, Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":4194322,"physical_keycode":0,"key_label":0,"unicode":0,"location":0,"echo":false,"script":null)
+]
+}
+move_left={
+"deadzone": 0.5,
+"events": [Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":65,"physical_keycode":0,"key_label":0,"unicode":0,"location":0,"echo":false,"script":null)
+, Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":4194319,"physical_keycode":0,"key_label":0,"unicode":0,"location":0,"echo":false,"script":null)
+]
+}
+move_right={
+"deadzone": 0.5,
+"events": [Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":68,"physical_keycode":0,"key_label":0,"unicode":0,"location":0,"echo":false,"script":null)
+, Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":4194321,"physical_keycode":0,"key_label":0,"unicode":0,"location":0,"echo":false,"script":null)
+]
+}
+fire_primary={
+"deadzone": 0.5,
+"events": [Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":32,"physical_keycode":0,"key_label":0,"unicode":0,"location":0,"echo":false,"script":null)
+]
+}
+fire_secondary={
+"deadzone": 0.5,
+"events": [Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":70,"physical_keycode":0,"key_label":0,"unicode":0,"location":0,"echo":false,"script":null)
+]
+}
+fire_special={
+"deadzone": 0.5,
+"events": [Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":69,"physical_keycode":0,"key_label":0,"unicode":0,"location":0,"echo":false,"script":null)
+]
+}
+pause_game={
+"deadzone": 0.5,
+"events": [Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":4194305,"physical_keycode":0,"key_label":0,"unicode":0,"location":0,"echo":false,"script":null)
+]
+}
+debug_overlay={
+"deadzone": 0.5,
+"events": [Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":4194336,"physical_keycode":0,"key_label":0,"unicode":0,"location":0,"echo":false,"script":null)
+]
+}
+quick_restart={
+"deadzone": 0.5,
+"events": [Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":true,"meta_pressed":false,"pressed":false,"keycode":82,"physical_keycode":0,"key_label":0,"unicode":0,"location":0,"echo":false,"script":null)
+]
+}

godot/scenes/bootstrap/GameRoot.tscn

@@ -0,0 +1,14 @@
+[gd_scene load_steps=5 format=3 uid="uid://b1fxc23gkbqre"]
+
+[ext_resource type="Script" path="res://scripts/bootstrap/GameRoot.cs" id="1_game_root"]
+[ext_resource type="Script" path="res://scripts/debug/DebugOverlay.cs" id="2_debug_overlay"]
+[ext_resource type="PackedScene" path="res://scenes/menu/MenuPlaceholder.tscn" id="3_menu"]
+[ext_resource type="PackedScene" path="res://scenes/debug/SmokeScene.tscn" id="4_smoke"]
+
+[node name="GameRoot" type="Node"]
+script = ExtResource("1_game_root")
+MenuScene = ExtResource("3_menu")
+SmokeScene = ExtResource("4_smoke")
+
+[node name="DebugOverlay" type="CanvasLayer" parent="."]
+script = ExtResource("2_debug_overlay")

godot/scenes/debug/SmokeScene.tscn

@@ -0,0 +1,18 @@
+[gd_scene load_steps=2 format=3 uid="uid://dpsx0hxc4vd5s"]
+
+[ext_resource type="Script" path="res://scripts/debug/SmokeSceneController.cs" id="1_smoke_scene_controller"]
+
+[node name="SmokeScene" type="Node2D"]
+script = ExtResource("1_smoke_scene_controller")
+
+[node name="HeroPlaceholder" type="Polygon2D" parent="."]
+position = Vector2(160, 180)
+color = Color(0.25, 0.85, 1, 1)
+polygon = PackedVector2Array(48, 0, -32, -24, -12, 0, -32, 24)
+
+[node name="SmokeLabel" type="Label" parent="."]
+offset_left = 96.0
+offset_top = 224.0
+offset_right = 384.0
+offset_bottom = 256.0
+text = "Smoke Scene"

godot/scenes/menu/MenuPlaceholder.tscn

@@ -0,0 +1,46 @@
+[gd_scene load_steps=2 format=3 uid="uid://cg86dxl2ys1vh"]
+
+[ext_resource type="Script" path="res://scripts/menu/MenuPlaceholder.cs" id="1_menu_placeholder"]
+
+[node name="MenuPlaceholder" type="Control"]
+layout_mode = 3
+anchors_preset = 15
+anchor_right = 1.0
+anchor_bottom = 1.0
+grow_horizontal = 2
+grow_vertical = 2
+script = ExtResource("1_menu_placeholder")
+
+[node name="Title" type="Label" parent="."]
+layout_mode = 1
+anchors_preset = 8
+anchor_left = 0.5
+anchor_top = 0.5
+anchor_right = 0.5
+anchor_bottom = 0.5
+offset_left = -210.0
+offset_top = -32.0
+offset_right = 210.0
+offset_bottom = 0.0
+grow_horizontal = 2
+grow_vertical = 2
+horizontal_alignment = 1
+vertical_alignment = 1
+text = "SideScrollerGame - Menu Placeholder"
+
+[node name="Hint" type="Label" parent="."]
+layout_mode = 1
+anchors_preset = 8
+anchor_left = 0.5
+anchor_top = 0.5
+anchor_right = 0.5
+anchor_bottom = 0.5
+offset_left = -240.0
+offset_top = 8.0
+offset_right = 240.0
+offset_bottom = 40.0
+grow_horizontal = 2
+grow_vertical = 2
+horizontal_alignment = 1
+vertical_alignment = 1
+text = "Run with -- --debug-boot=smoke for smoke scene"

godot/scripts/bootstrap/GameRoot.cs

@@ -0,0 +1,59 @@
+#nullable enable
+
+using Godot;
+using SideScrollerGame.Debug;
+
+namespace SideScrollerGame.Bootstrap;
+
+public partial class GameRoot : Node
+{
+    public override void _Ready()
+    {
+        m_Settings = DebugSettings.Load();
+        GD.Seed((ulong)m_Settings.Seed);
+
+        GD.Print($"Debug boot: {m_Settings.BootMode}");
+        GD.Print($"Seed: {m_Settings.Seed}");
+
+        LoadBootScene(m_Settings.BootMode);
+    }
+
+    public void LoadBootScene(DebugBootMode bootMode)
+    {
+        PackedScene? scene = bootMode switch
+        {
+            DebugBootMode.Smoke => SmokeScene,
+            _                   => MenuScene
+        };
+
+        string loadedSceneId = bootMode.ToString();
+        if (scene is null)
+        {
+            GD.PushError($"No scene configured for debug boot mode '{bootMode}'.");
+            return;
+        }
+
+        if (m_LoadedScene is not null)
+        {
+            m_LoadedScene.QueueFree();
+        }
+
+        m_LoadedScene = scene.Instantiate();
+        AddChild(m_LoadedScene);
+
+        DebugOverlay? overlay = GetNodeOrNull<DebugOverlay>("DebugOverlay");
+        if (overlay is not null && m_Settings is not null)
+        {
+            overlay.SetStatus(m_Settings, loadedSceneId);
+        }
+    }
+
+    [Export]
+    public PackedScene? MenuScene { get; set; }
+
+    [Export]
+    public PackedScene? SmokeScene { get; set; }
+
+    private Node? m_LoadedScene;
+    private DebugSettings? m_Settings;
+}

godot/scripts/bootstrap/GameRoot.cs.uid

@@ -0,0 +1 @@
+uid://b28od0hdkj1kx

godot/scripts/debug/DebugBootMode.cs

@@ -0,0 +1,7 @@
+namespace SideScrollerGame.Debug;
+
+public enum DebugBootMode
+{
+    Menu,
+    Smoke
+}

godot/scripts/debug/DebugBootMode.cs.uid

@@ -0,0 +1 @@
+uid://cebwe1o0qw160

godot/scripts/debug/DebugOverlay.cs

@@ -0,0 +1,43 @@
+#nullable enable
+
+using Godot;
+
+namespace SideScrollerGame.Debug;
+
+public partial class DebugOverlay : CanvasLayer
+{
+    public override void _Ready()
+    {
+        Layer = 100;
+        ProcessMode = ProcessModeEnum.Always;
+        EnsureLabel();
+    }
+
+    public void SetStatus(DebugSettings settings, string loadedSceneId)
+    {
+        Label label = EnsureLabel();
+        label.Text = $"Debug boot: {settings.BootMode}\nSeed: {settings.Seed}\nScene: {loadedSceneId}\nDebug: {OS.IsDebugBuild()}";
+    }
+
+    private Label EnsureLabel()
+    {
+        if (m_StatusLabel is not null)
+        {
+            return m_StatusLabel;
+        }
+
+        m_StatusLabel = GetNodeOrNull<Label>("StatusLabel");
+        if (m_StatusLabel is null)
+        {
+            m_StatusLabel = new Label { Name = "StatusLabel" };
+            AddChild(m_StatusLabel);
+        }
+
+        m_StatusLabel.MouseFilter = Control.MouseFilterEnum.Ignore;
+        m_StatusLabel.Position = new Vector2(8.0f, 8.0f);
+        m_StatusLabel.AutowrapMode = TextServer.AutowrapMode.Off;
+        return m_StatusLabel;
+    }
+
+    private Label? m_StatusLabel;
+}

godot/scripts/debug/DebugOverlay.cs.uid

@@ -0,0 +1 @@
+uid://b41hmmnemingf

godot/scripts/debug/DebugSettings.cs

@@ -0,0 +1,91 @@
+using System;
+using Godot;
+
+namespace SideScrollerGame.Debug;
+
+public sealed class DebugSettings
+{
+    public DebugSettings(DebugBootMode bootMode, int seed)
+    {
+        BootMode = bootMode;
+        Seed = seed;
+    }
+
+    public static DebugSettings Load()
+    {
+        DebugBootMode bootMode = LoadBootModeFromProjectSettings();
+        int seed = LoadSeedFromProjectSettings();
+
+        foreach (string argument in OS.GetCmdlineUserArgs())
+        {
+            if (argument.StartsWith(DebugBootModePrefix, StringComparison.OrdinalIgnoreCase))
+            {
+                string value = argument[DebugBootModePrefix.Length..];
+                if (TryParseBootMode(value, out DebugBootMode parsedBootMode))
+                {
+                    bootMode = parsedBootMode;
+                }
+                else
+                {
+                    GD.PushWarning($"Unknown debug boot mode '{value}'. Falling back to Menu.");
+                    bootMode = DebugBootMode.Menu;
+                }
+            }
+            else if (argument.StartsWith(SeedPrefix, StringComparison.OrdinalIgnoreCase))
+            {
+                string value = argument[SeedPrefix.Length..];
+                if (int.TryParse(value, out int parsedSeed))
+                {
+                    seed = parsedSeed;
+                }
+                else
+                {
+                    GD.PushWarning($"Unknown debug seed '{value}'. Keeping seed {seed}.");
+                }
+            }
+        }
+
+        return new DebugSettings(bootMode, seed);
+    }
+
+    public DebugBootMode BootMode { get; }
+
+    public int Seed { get; }
+
+    private static DebugBootMode LoadBootModeFromProjectSettings()
+    {
+        if (!ProjectSettings.HasSetting(DebugBootModeSetting))
+        {
+            return DebugBootMode.Menu;
+        }
+
+        string configuredBootMode = ProjectSettings.GetSetting(DebugBootModeSetting).AsString();
+        if (TryParseBootMode(configuredBootMode, out DebugBootMode bootMode))
+        {
+            return bootMode;
+        }
+
+        GD.PushWarning($"Unknown configured debug boot mode '{configuredBootMode}'. Falling back to Menu.");
+        return DebugBootMode.Menu;
+    }
+
+    private static int LoadSeedFromProjectSettings()
+    {
+        if (!ProjectSettings.HasSetting(DebugSeedSetting))
+        {
+            return 1;
+        }
+
+        return ProjectSettings.GetSetting(DebugSeedSetting).AsInt32();
+    }
+
+    private static bool TryParseBootMode(string value, out DebugBootMode bootMode)
+    {
+        return Enum.TryParse(value, true, out bootMode);
+    }
+
+    private const string DebugBootModePrefix = "--debug-boot=";
+    private const string DebugBootModeSetting = "application/run/debug_boot_mode";
+    private const string DebugSeedSetting = "application/run/debug_seed";
+    private const string SeedPrefix = "--seed=";
+}

godot/scripts/debug/DebugSettings.cs.uid

@@ -0,0 +1 @@
+uid://m3c08h4ms4qu

godot/scripts/debug/SmokeSceneController.cs

@@ -0,0 +1,24 @@
+using Godot;
+
+namespace SideScrollerGame.Debug;
+
+public partial class SmokeSceneController : Node2D
+{
+    public override async void _Ready()
+    {
+        GD.Print("Smoke scene loaded");
+
+        if (!IsHeadless())
+        {
+            return;
+        }
+
+        await ToSignal(GetTree(), SceneTree.SignalName.ProcessFrame);
+        GetTree().Quit(0);
+    }
+
+    private static bool IsHeadless()
+    {
+        return DisplayServer.GetName().Equals("headless", System.StringComparison.OrdinalIgnoreCase);
+    }
+}

godot/scripts/debug/SmokeSceneController.cs.uid

@@ -0,0 +1 @@
+uid://dwc6njr4c222l

godot/scripts/menu/MenuPlaceholder.cs

@@ -0,0 +1,23 @@
+#nullable enable
+
+using Godot;
+
+namespace SideScrollerGame.Menu;
+
+public partial class MenuPlaceholder : Control
+{
+    public override void _Ready()
+    {
+        Label? title = GetNodeOrNull<Label>("Title");
+        if (title is not null)
+        {
+            title.Text = "SideScrollerGame - Menu Placeholder";
+        }
+
+        Label? hint = GetNodeOrNull<Label>("Hint");
+        if (hint is not null)
+        {
+            hint.Text = "Run with -- --debug-boot=smoke for smoke scene";
+        }
+    }
+}

godot/scripts/menu/MenuPlaceholder.cs.uid

@@ -0,0 +1 @@
+uid://bhmyn841byhuk