Fix engine-wide code review findings

Collisions: init bucket heads to -1 (QueryAabb hung before the first
rebuild), reset query stamps on truncated QueryAabb (later queries
silently dropped entities), inside-origin raycasts hit at fraction 0 for
circles too, exactly-touching boxes now pair like touching circles.

Graphics: render into the letterbox viewport so the picture matches
ScreenToWorld/WorldToScreen instead of stretching; Y-sort by the
transform pivot rather than the quad center; lock-free snapshot
LayerRegistry (parallel submit read it unsynchronized); validate
InitialCapacity; warn when UseRenderer2D drops options of a later scene.

Core: scenes are explicitly single-use (re-loading threw silently
duplicated systems/entities before — now it throws), Scene.RegisterUnload
for per-scene resources, a switch requested during the reveal phase
covers again instead of hard-swapping, borderless fullscreen
(HardwareModeSwitch off), InputCapture service for input-suppressing
overlays, host disposes the transition renderer and IDisposable services
on shutdown.

Input: game input reads as released while InputCapture is held; mouse
position and wheel freeze so deltas stay zero.

DevConsole: holds InputCapture while open (typing no longer drives the
camera), Revision increments only under the lock, quoted command
arguments, history capped at 256.

UI: scene Desktop skips Myra input processing while the console is open
(clicks no longer fall through), is disposed on scene unload, and Myra
init no longer depends on a process-static flag.

Audio: validate channel count/sample rate before stopping the previous
track, empty looped oggs no longer hang FillBuffers, the instance stops
when a non-looping track drains (IsPlaying was stuck true).

Atlases: metadata v2 stores per-source size+mtime snapshots, so
timestamp-preserving copies and renames invalidate correctly; loader
checks the version and disposes pages on partial load failure; shared
pages never exceed a non-POT MaxPageSize; oversized items pack first
onto exact-size pages instead of splitting an open shared page; the CLI
validates numeric options.

Assets.Generator: file names are escaped in XML docs and string
literals, members no longer collide with the enclosing class (CS0542),
and the Assets root is resolved against build_property.projectdir so
nested "Assets" directories do not shift region paths.

Pathfinding: queries throw when the grid was resized after construction;
generation stamps survive int overflow.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/MrGameEng.UI/SceneUiExtensions.cs

@@ -9,41 +9,66 @@ namespace MrGameEng.UI;
 /// <summary>
 /// Draw system rendering the scene's Myra <see cref="Desktop"/>. Must run after the scene's
 /// world rendering (register UI last in the draw phase) — the UI is drawn on top in window
-/// pixels and also processes mouse/keyboard interaction during render.
+/// pixels and also processes mouse/keyboard interaction during render. While
+/// <see cref="InputCapture.Captured"/> is set (developer console open), the desktop is drawn
+/// without processing input, so overlay clicks and keystrokes do not fall through to it.
 /// </summary>
 public sealed class UiRenderSystem : BaseSystem
 {
     private readonly Desktop _desktop;
+    private readonly InputCapture? _capture;
 
     /// <summary>Creates the system for <paramref name="desktop"/>.</summary>
-    public UiRenderSystem(Desktop desktop) => _desktop = desktop;
+    public UiRenderSystem(Desktop desktop, InputCapture? capture = null)
+    {
+        _desktop = desktop;
+        _capture = capture;
+    }
 
     /// <inheritdoc />
-    protected override void OnUpdateGroup() => _desktop.Render();
+    protected override void OnUpdateGroup()
+    {
+        if (_capture?.Captured == true)
+        {
+            // Render() = UpdateInput + UpdateLayout + RenderVisual; пропускаем только ввод.
+            _desktop.UpdateLayout();
+            _desktop.RenderVisual();
+        }
+        else
+        {
+            _desktop.Render();
+        }
+    }
 }
 
 /// <summary>Wires the UI module (Myra) into a <see cref="Scene"/>.</summary>
 public static class SceneUiExtensions
 {
-    private static bool _environmentInitialized;
-
     /// <summary>
     /// Creates a Myra <see cref="Desktop"/> for this scene and registers
     /// <see cref="UiRenderSystem"/> in the draw phase. Call from <c>OnLoad</c>
     /// <b>after</b> <c>UseRenderer2D()</c> so the UI draws on top of the world.
-    /// Build the UI by assigning <see cref="Desktop.Root"/>.
+    /// Build the UI by assigning <see cref="Desktop.Root"/>. The desktop is disposed
+    /// automatically when the scene unloads.
     /// </summary>
     public static Desktop UseUI(this Scene scene)
     {
-        // Геттер MyraEnvironment.Game бросает исключение, пока Game не задан — проверять через ??= нельзя.
-        if (!_environmentInitialized)
+        var services = scene.Context.Services;
+
+        // Присваивание идемпотентно; геттер MyraEnvironment.Game бросает исключение, пока
+        // Game не задан, поэтому проверять текущее значение перед записью нельзя.
+        MyraEnvironment.Game = services.Get<Game>();
+
+        var capture = services.GetOrDefault<InputCapture>();
+        if (capture is null)
         {
-            MyraEnvironment.Game = scene.Context.Services.Get<Game>();
-            _environmentInitialized = true;
+            capture = new InputCapture();
+            services.Add(capture);
         }
 
         var desktop = new Desktop();
-        scene.DrawSystems.Add(new UiRenderSystem(desktop));
+        scene.RegisterUnload(desktop.Dispose);
+        scene.DrawSystems.Add(new UiRenderSystem(desktop, capture));
         return desktop;
     }
 }