feat(render): Campaign V slice V11 commit 1 - delete ImGui, Studio, and the DevTools frontend

The ImGui developer-tools stack (AcDream.UI.ImGui), UI Studio
(src/AcDream.App/Studio), and the DevToolsFramePresenter/
SettingsDevToolsCompositionPhase ImGui composition machinery are removed.
Vulkan never composed a DevTools frontend (DevToolsEnabled already forced
false whenever the backend was Vulkan); this commit makes that permanent by
deleting the only implementation rather than leaving a dead branch behind.

What moved: Studio/SampleData.cs is a live production dependency
(InteractionRetainedUiComposition's character-sheet fallback, plus three
UI.Layout test files) - git mv'd to src/AcDream.App/UI/Layout/SampleData.cs,
namespace AcDream.App.UI.Layout, and trimmed to the SampleCharacter API that
is actually still called (BuildObjectTable/AddItem/AddEquipped/the item-guid
and icon constants had zero callers left once the Studio fixture provider
that used them was deleted).

What survives as backend-neutral seams, per the tests that still exercise
them: IDevToolsFrameLifecycle (moved into RenderFramePreparationController.cs,
now always bound to null), IFramebufferDevToolsTarget/FramebufferDevToolsBinding
in FramebufferResizeController.cs (its concrete DevToolsFramebufferTarget
adapter is deleted), and IDevToolsGameplayCommands in
GameplayInputCommandController.cs (DevToolsGameplayCommands becomes a
documented no-op instead of forwarding to the deleted presenter). A follow-up
re-homes Settings/Debug onto the retained UI through IPanelRenderer; until
then keybind remapping falls back to editing keybinds.json.

DevToolsEnabled is now `private const bool DevToolsEnabled = false`.
RuntimeOptions.DevTools is unchanged and still reaches VulkanGraphicsContext
for the optional debug-utils extensions; Program.cs now logs one line when
ACDREAM_DEVTOOLS=1 explaining that the ImGui UI is gone and the flag is
Vulkan-only now.

Removed: AcDream.UI.ImGui (project + ImGui.NET/Silk.NET.OpenGL.Extensions.ImGui
package refs), src/AcDream.App/Studio (minus SampleData.cs),
DevToolsFramePresenter.cs and everything only it constructed
(ISettingsDevToolsCompositionFactory, RetailSettingsDevToolsCompositionFactory,
DevToolsCompositionOwner, IGameWindowSettingsDevToolsPublication,
SettingsDevToolsOptionalDependencies, the "developer tools" shutdown-ledger
stage and its DevTools-typed fields on IngressShutdownRoots/
RenderShutdownRoots), the ui-studio Program.cs verb, and the cimgui native
manifest entries in GraphicalHostPlatformServices. GameWindow.cs's DevTools
composition branch, its _vitalsVm/_debugVm/_devToolsComposition/
_devToolsFramePresenter/_devToolsCommandBus fields, and every settingsDevTools
.DevTools?.* access across FrameRootComposition.cs/SessionPlayerComposition.cs
are gone with it.

Build green; complete Release solution suite 8,830 / 5 skips (App Tests
4,097/3 skips run standalone - one #250-family zero-allocation test flakes
under the full parallel `dotnet test AcDream.slnx` run, a pre-existing,
documented class unrelated to this change).

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

src/AcDream.App/UI/Layout/SampleData.cs

@@ -0,0 +1,94 @@
+namespace AcDream.App.UI.Layout;
+
+/// <summary>
+/// Static sample character-sheet data. It is the character-sheet fallback
+/// used when no live session has produced a real <see cref="CharacterSheet"/>
+/// yet, and the fixture the character/attribute UI panel tests bind against.
+/// </summary>
+public static class SampleData
+{
+    /// <summary>
+    /// Returns a representative <see cref="CharacterSheet"/>. Values are
+    /// plausible retail-scale numbers so the report renders with
+    /// well-proportioned text in all sections.
+    /// </summary>
+    public static CharacterSheet SampleCharacter() => SampleCharacter(null);
+
+    public static CharacterSheet SampleCharacter(string? name) => new()
+    {
+        Name       = string.IsNullOrWhiteSpace(name) ? "Studio Player" : name,
+        Level      = 126,
+        Gender     = "Female",
+        Heritage   = "Aluvian",
+        Title      = "the Adventurer",
+        BirthDate  = "January 5, 2001",
+        PlayTime   = "2 years, 114 days, 4 hours",
+        Deaths     = 42,
+
+        PkStatus      = "Non-Player Killer",
+        TotalXp       = 1_250_000_000,
+        XpToNextLevel = 42_000_000,
+        XpFraction    = 0.63f,
+
+        // Vitals: retail screenshot spec (Pass 1 acceptance criteria §Goal).
+        HealthCurrent  = 5,    HealthMax  = 5,
+        StaminaCurrent = 10,   StaminaMax = 10,
+        ManaCurrent    = 10,   ManaMax    = 10,
+
+        // Attributes: Strength + Quickness = 200; all others = 10 (retail screenshot spec §Goal).
+        Strength     = 200,
+        Endurance    = 10,
+        Quickness    = 200,
+        Coordination = 10,
+        Focus        = 10,
+        Self         = 10,
+
+        UnspentSkillCredits     = 12,
+        SpecializedSkillCredits = 4,
+        ChessRank = 12,
+        FishingSkill = 4,
+
+        // Available skill credits (retail InqInt(0x18)); shown in Attributes tab footer State-A.
+        SkillCredits = 96,
+
+        // Unassigned (banked) XP (retail InqInt64(2)); footer State-A line-2 value.
+        UnassignedXp = 87_757_321_741L,
+
+        // Raise costs in retail display order (Strength, Endurance, Coordination, Quickness,
+        // Focus, Self, Health, Stamina, Mana).
+        // Str@200 = maxed → 0 (disabled). Quickness@200 = maxed → 0. Others @10 → affordable.
+        // Focus@10 → 110 matches the authoritative retail screenshot (spec §4).
+        // Formula bracket at value=10: ExperienceToAttributeLevel(11) − ExperienceToAttributeLevel(10).
+        AttributeRaiseCosts = new long[] { 0L, 95L, 100L, 0L, 110L, 105L, 90L, 88L, 112L },
+        AttributeRaise10Costs = new long[] { 0L, 950L, 1_000L, 0L, 1_100L, 1_050L, 900L, 880L, 1_120L },
+
+        // Real SkillTable icon IDs and train/specialize costs from client_portal.dat
+        // SkillTable 0x0E000004. gmSkillUI groups/sorts these at bind time.
+        Skills = new CharacterSkill[]
+        {
+            new( 6, "Melee Defense",   0x06000165u, CharacterSkillAdvancementClass.Specialized, 350, 354, false, 10, 20, 18_250_000L, 182_500_000L),
+            new(34, "War Magic",       0x06001365u, CharacterSkillAdvancementClass.Specialized, 280, 285, false, 16, 28, 11_100_000L, 111_000_000L),
+
+            new(14, "Arcane Lore",     0x0600016Eu, CharacterSkillAdvancementClass.Trained,     260, 269, false,  4,  6,  7_500_000L,  75_000_000L),
+            new(33, "Life Magic",      0x06001364u, CharacterSkillAdvancementClass.Trained,     250, 252, false, 12, 20,  6_800_000L,  68_000_000L),
+            new(47, "Missile Weapons", 0x0600015Fu, CharacterSkillAdvancementClass.Trained,     220, 221, false,  6, 12,  5_250_000L,  52_500_000L),
+
+            new(21, "Healing",         0x06000133u, CharacterSkillAdvancementClass.Untrained,    10,  10, true,   6, 10, 0L),
+            new(22, "Jump",            0x0600016Bu, CharacterSkillAdvancementClass.Untrained,   210, 210, true,   0,  4, 0L),
+            new(36, "Loyalty",         0x06001367u, CharacterSkillAdvancementClass.Untrained,    10,  10, true,   0,  2, 0L),
+            new(24, "Run",             0x06000173u, CharacterSkillAdvancementClass.Untrained,   390, 390, true,   0,  4, 0L),
+
+            new(38, "Alchemy",         0x060019E4u, CharacterSkillAdvancementClass.Untrained,    10,  10, false,  6, 12, 0L),
+            new(39, "Cooking",         0x06001A54u, CharacterSkillAdvancementClass.Untrained,    10,  10, false,  4,  8, 0L),
+            new(37, "Fletching",       0x06001A55u, CharacterSkillAdvancementClass.Untrained,    10,  10, false,  4,  8, 0L),
+        },
+
+        CharacterInfoProperties = new Dictionary<uint, int>
+        {
+            [0x162u] = 2, // Swords melee mastery
+        },
+
+        BurdenCurrent = 1200,
+        BurdenMax     = 4500,
+    };
+}