Body step 2.1: climbing, mantling, crawling, legs, playground, 144 Hz

- Step rule + lower-body collider: no walking onto tables, steps <= 0.35 m
- Structural hand strength: two-hand mantle/pull-up works, one hand can't
- Arms aim from the physical shoulder horizontally, keep True Body pose vertically
- Crawl pose, crawl carry, 35 deg slope limit, ground feed-forward ignores
  play-space corrections (fixes a runaway feedback loop)
- Grab static world (climbing), procedural visual legs
- Playground sandbox; menu strength slider, spectator (old drag) and turn toggles
- Physics 144 Hz with interpolation; legacy chase-body spikes pin 90 Hz
- RagdollSpike: 27 phases incl. mantle, pull-up, crawl, ledge drop, ramps

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

scripts/MainMenu.cs

@@ -18,6 +18,9 @@ public partial class MainMenu : PanelContainer
     public event Action PingRequested;
     public event Action CloseRequested;
     public event Action Clicked;
+    public event Action<bool> SpectatorToggled;
+    public event Action<bool> SmoothTurnToggled;
+    public event Action<float> StrengthChanged;
 
     public TabContainer Tabs { get; private set; }
     public Button ReturnToSpawnButton { get; private set; }
@@ -27,6 +30,9 @@ public partial class MainMenu : PanelContainer
     public Button CloseButton { get; private set; }
     public Button HeaderCloseButton { get; private set; }
     public HSlider ClickVolumeSlider { get; private set; }
+    public HSlider StrengthSlider { get; private set; }
+    public Button SpectatorButton { get; private set; }
+    public Button TurnModeButton { get; private set; }
     public ScrollContainer LogScroll { get; private set; }
 
     private Label _fpsLabel;
@@ -116,6 +122,39 @@ public partial class MainMenu : PanelContainer
         _calibrationStatus.AddThemeColorOverride("font_color", new Color(0.6f, 0.6f, 0.65f));
         calibRow.AddChild(_calibrationStatus);
         player.AddChild(calibRow);
+
+        // Nimso's single strength value: every muscle and the hand guides scale with it.
+        HBoxContainer strengthRow = new();
+        strengthRow.AddThemeConstantOverride("separation", 20);
+        Label strengthLabel = new() { Text = "Strength 1.00×", VerticalAlignment = VerticalAlignment.Center, CustomMinimumSize = new Vector2(220, 0) };
+        strengthRow.AddChild(strengthLabel);
+        StrengthSlider = new HSlider
+        {
+            MinValue = 0.25,
+            MaxValue = 3,
+            Step = 0.05,
+            Value = 1,
+            SizeFlagsHorizontal = SizeFlags.ExpandFill,
+            SizeFlagsVertical = SizeFlags.ShrinkCenter,
+            CustomMinimumSize = new Vector2(0, 48),
+            FocusMode = FocusModeEnum.None,
+        };
+        StrengthSlider.ValueChanged += v =>
+        {
+            strengthLabel.Text = $"Strength {v:0.00}×";
+            StrengthChanged?.Invoke((float)v);
+        };
+        strengthRow.AddChild(StrengthSlider);
+        player.AddChild(strengthRow);
+
+        HBoxContainer modeRow = new();
+        modeRow.AddThemeConstantOverride("separation", 16);
+        TurnModeButton = MakeToggle("Turning: snap", "Turning: smooth", on => SmoothTurnToggled?.Invoke(on));
+        modeRow.AddChild(TurnModeButton);
+        // Spectator: no body; fly around by grabbing the air (the old drag movement).
+        SpectatorButton = MakeToggle("Spectator: off", "Spectator: on (grab-fly)", on => SpectatorToggled?.Invoke(on));
+        modeRow.AddChild(SpectatorButton);
+        player.AddChild(modeRow);
         Tabs.AddChild(player);
 
         // World
@@ -180,6 +219,25 @@ public partial class MainMenu : PanelContainer
         return page;
     }
 
+    private Button MakeToggle(string offText, string onText, Action<bool> changed)
+    {
+        Button button = new()
+        {
+            Text = offText,
+            ToggleMode = true,
+            CustomMinimumSize = new Vector2(0, ButtonHeight),
+            SizeFlagsHorizontal = SizeFlags.ExpandFill,
+            FocusMode = FocusModeEnum.None,
+        };
+        button.Toggled += on =>
+        {
+            button.Text = on ? onText : offText;
+            Clicked?.Invoke();
+            Callable.From(() => changed(on)).CallDeferred();
+        };
+        return button;
+    }
+
     private Button MakeButton(string text, Action action)
     {
         Button button = new()