feat(headless): share immutable gameplay content

src/AcDream.App/Rendering/GameWindow.cs

@@ -392,7 +392,7 @@ public sealed class GameWindow :
     private AcDream.App.UI.ItemInteractionController? _itemInteractionController;
     private AcDream.App.World.ExternalContainerLifecycleController? _externalContainerLifecycle;
     private AcDream.App.Spells.MagicRuntime? _magicRuntime;
-    private AcDream.App.Spells.MagicCatalog? _magicCatalog;
+    private MagicCatalog? _magicCatalog;
     private readonly AcDream.Core.Items.StackSplitQuantityState _stackSplitQuantity = new();
     // Phase D.2b Sub-phase C Slice 2 — the 3-D doll viewport: an off-screen RTT renderer, the UiViewport
     // widget that blits it, the inventory frame (for the open-gate), and a dirty flag (re-dress on 0xF625).
@@ -750,7 +750,7 @@ public sealed class GameWindow :
             "prepared asset source");
 
     void IGameWindowContentEffectsAudioPublication.PublishMagicCatalog(
-        AcDream.App.Spells.MagicCatalog value) =>
+        MagicCatalog value) =>
         PublishCompositionOwner(ref _magicCatalog, value, "magic catalog");
 
     void IGameWindowContentEffectsAudioPublication.PublishAnimationLoader(

src/AcDream.App/Spells/MagicRuntime.cs

@@ -1,163 +1,18 @@
 using System;
 using System.Collections.Generic;
-using System.Linq;
 using AcDream.Core.Items;
 using AcDream.Core.Spells;
 using AcDream.Runtime.Gameplay;
-using DatReaderWriter;
 using AcDream.Content;
-using DatReaderWriter.DBObjs;
-using CoreSpellTable = AcDream.Core.Spells.SpellTable;
 
 namespace AcDream.App.Spells;
 
-/// <summary>Immutable presentation metadata for one retail spell component WCID.</summary>
-public sealed record SpellComponentDescriptor(
-    uint WeenieClassId,
-    string Name,
-    uint Category,
-    uint IconId);
-
 /// <summary>One resolved formula cell in retail's spell examination subview.</summary>
 public readonly record struct SpellExamineComponent(
     uint SpellComponentId,
     SpellComponentDescriptor Descriptor,
     bool Owned);
 
-/// <summary>
-/// App-layer projection of retail's spell, component, and school-focus DAT tables.
-/// Keeping this catalog outside <c>GameWindow</c> makes the SCID/WCID boundary and
-/// rough spell-level calculation one independently testable ownership seam.
-/// </summary>
-public sealed class MagicCatalog
-{
-    private const uint SpellTableDid = 0x0E00000Eu;
-    private const uint SpellComponentTableDid = 0x0E00000Fu;
-    private const uint ComponentIdMapDid = 0x27000002u;
-
-    private readonly IReadOnlyDictionary<uint, SpellFormulaDefinition> _formulaDefinitions;
-    private readonly IReadOnlyDictionary<uint, uint> _wcidByScid;
-    private readonly IReadOnlyDictionary<uint, uint> _magicPackWcidBySchool;
-    private readonly IReadOnlyDictionary<uint, int> _spellLevels;
-
-    private MagicCatalog(
-        CoreSpellTable spellTable,
-        IReadOnlyDictionary<uint, SpellComponentDescriptor> components,
-        IReadOnlyDictionary<uint, SpellFormulaDefinition> formulaDefinitions,
-        IReadOnlyDictionary<uint, uint> wcidByScid,
-        IReadOnlyDictionary<uint, uint> magicPackWcidBySchool,
-        IReadOnlyDictionary<uint, int> spellLevels)
-    {
-        SpellTable = spellTable;
-        Components = components;
-        _formulaDefinitions = formulaDefinitions;
-        _wcidByScid = wcidByScid;
-        _magicPackWcidBySchool = magicPackWcidBySchool;
-        _spellLevels = spellLevels;
-    }
-
-    public CoreSpellTable SpellTable { get; }
-    public IReadOnlyDictionary<uint, SpellComponentDescriptor> Components { get; }
-
-    public bool TryGetComponentBySpellComponentId(
-        uint spellComponentId,
-        out SpellComponentDescriptor descriptor)
-    {
-        if (_wcidByScid.TryGetValue(spellComponentId, out uint weenieClassId)
-            && Components.TryGetValue(weenieClassId, out SpellComponentDescriptor? found))
-        {
-            descriptor = found;
-            return true;
-        }
-        descriptor = null!;
-        return false;
-    }
-
-    public bool IsComponentPack(uint weenieClassId)
-        => Components.ContainsKey(weenieClassId);
-
-    public int GetSpellLevel(uint spellId)
-        => _spellLevels.TryGetValue(spellId, out int level) ? level : 0;
-
-    public SpellComponentRequirementService CreateRequirementService(
-        ClientObjectTable objects,
-        Func<uint> playerGuid,
-        Func<string> accountName)
-        => new(
-            objects,
-            playerGuid,
-            accountName,
-            _formulaDefinitions,
-            _wcidByScid,
-            _magicPackWcidBySchool);
-
-    public static MagicCatalog Load(IDatReaderWriter dats)
-    {
-        ArgumentNullException.ThrowIfNull(dats);
-
-        var components = new Dictionary<uint, SpellComponentDescriptor>();
-        var wcidByScid = new Dictionary<uint, uint>();
-        SpellComponentTable? componentTable = dats.Get<SpellComponentTable>(SpellComponentTableDid);
-        DualEnumIDMap? componentIds = dats.Get<DualEnumIDMap>(ComponentIdMapDid);
-        if (componentTable is not null && componentIds is not null)
-        {
-            foreach (var pair in componentTable.Components)
-            {
-                if (!componentIds.ClientEnumToID.TryGetValue(pair.Key, out uint wcid))
-                    continue;
-
-                wcidByScid[pair.Key] = wcid;
-                components[wcid] = new SpellComponentDescriptor(
-                    wcid,
-                    pair.Value.Name.Value,
-                    pair.Value.Category,
-                    pair.Value.Icon.DataId);
-            }
-        }
-
-        var metadata = new List<SpellMetadata>();
-        var formulaDefinitions = new Dictionary<uint, SpellFormulaDefinition>();
-        var spellLevels = new Dictionary<uint, int>();
-        DatReaderWriter.DBObjs.SpellTable spellTable =
-            dats.Get<DatReaderWriter.DBObjs.SpellTable>(SpellTableDid)
-            ?? throw new InvalidOperationException(
-                $"Required retail SpellTable 0x{SpellTableDid:X8} is missing from portal.dat.");
-        foreach (var pair in spellTable.Spells)
-        {
-            SpellMetadata spell = RetailSpellMetadataProjector.Project(
-                pair.Key, pair.Value, componentTable);
-            metadata.Add(spell);
-            uint[] formula = spell.FormulaComponents.ToArray();
-            formulaDefinitions[pair.Key] = new SpellFormulaDefinition(
-                spell.FormulaVersion,
-                formula,
-                (uint)spell.SchoolId);
-            spellLevels[pair.Key] = spell.Generation;
-        }
-
-        var magicPackWcidBySchool = new Dictionary<uint, uint>();
-        // Retail IsComponentPack resolves enum key 0x10000001 in category 0x28;
-        // that key is not itself a portal.dat file id.
-        uint magicPackMapDid = AcDream.App.UI.RetailDataIdResolver.Resolve(
-            dats, 0x10000001u, 0x28u);
-        if (magicPackMapDid != 0u
-            && dats.Portal.TryGet<EnumIDMap>(magicPackMapDid, out EnumIDMap? magicPackMap)
-            && magicPackMap is not null)
-        {
-            foreach (var pair in magicPackMap.ClientEnumToID)
-                magicPackWcidBySchool[pair.Key] = pair.Value;
-        }
-
-        return new MagicCatalog(
-            CoreSpellTable.Create(metadata),
-            components,
-            formulaDefinitions,
-            wcidByScid,
-            magicPackWcidBySchool,
-            spellLevels);
-    }
-}
-
 /// <summary>
 /// App content/policy projection for Runtime's live retail magic request
 /// owner. The server owns turning, motion, fizzle, mana/component consumption,

src/AcDream.App/Streaming/LandblockBuildFactory.cs

@@ -1,4 +1,3 @@
-using System.Collections.Immutable;
 using DatReaderWriter;
 using AcDream.Content;
 
@@ -102,7 +101,9 @@ public sealed class LandblockBuildFactory
         }
 
         AcDream.Core.World.LandblockCollisionBuild collisions =
-            BuildPreparedCollisionClosure(build.Landblock);
+            LandblockPhysicsContentBuilder.BuildPreparedCollisionClosure(
+                _preparedCollisions,
+                build.Landblock);
         AcDream.Core.World.PhysicsDatBundle publicationDats =
             (build.Landblock.PhysicsDats
                 ?? AcDream.Core.World.PhysicsDatBundle.Empty)
@@ -155,59 +156,11 @@ public sealed class LandblockBuildFactory
         // expand into per-part MeshRefs via SetupMesh.Flatten.
         // GPU upload happens later through the render-thread presentation
         // pipeline, never in this worker-side build.
-        var hydrated = new List<AcDream.Core.World.WorldEntity>(baseLoaded.Entities.Count);
+        IReadOnlyList<AcDream.Core.World.WorldEntity> hydrated =
-        foreach (var e in baseLoaded.Entities)
+            LandblockPhysicsContentBuilder.HydrateStaticEntities(
-        {
+                _dats,
-            var meshRefs = new List<AcDream.Core.World.MeshRef>();
+                baseLoaded,
-            var stabBounds = new AcDream.Core.Meshing.LocalBoundsAccumulator();
+                worldOffset);
-
-            if ((e.SourceGfxObjOrSetupId & 0xFF000000u) == 0x01000000u)
-            {
-                // Single GfxObj stab — identity part transform.
-                var gfx = _dats.Get<DatReaderWriter.DBObjs.GfxObj>(e.SourceGfxObjOrSetupId);
-                if (gfx is not null)
-                {
-                    var pb = AcDream.Core.Meshing.GfxObjBounds.Get(gfx);
-                    if (pb is not null) stabBounds.Add(System.Numerics.Matrix4x4.Identity, pb.Value);
-                    meshRefs.Add(new AcDream.Core.World.MeshRef(
-                        e.SourceGfxObjOrSetupId, System.Numerics.Matrix4x4.Identity));
-                }
-            }
-            else if ((e.SourceGfxObjOrSetupId & 0xFF000000u) == 0x02000000u)
-            {
-                // Multi-part Setup — flatten to per-part GfxObj refs.
-                var setup = _dats.Get<DatReaderWriter.DBObjs.Setup>(e.SourceGfxObjOrSetupId);
-                if (setup is not null)
-                {
-                    var flat = AcDream.Core.Meshing.SetupMesh.Flatten(setup);
-                    foreach (var mr in flat)
-                    {
-                        var gfx = _dats.Get<DatReaderWriter.DBObjs.GfxObj>(mr.GfxObjId);
-                        if (gfx is null) continue;
-                        var pb = AcDream.Core.Meshing.GfxObjBounds.Get(gfx);
-                        if (pb is not null) stabBounds.Add(mr.PartTransform, pb.Value);
-                        meshRefs.Add(mr);
-                    }
-                }
-            }
-
-            if (meshRefs.Count == 0) continue;
-
-            var entity = new AcDream.Core.World.WorldEntity
-            {
-                Id = e.Id,
-                SourceGfxObjOrSetupId = e.SourceGfxObjOrSetupId,
-                Position = e.Position + worldOffset,
-                Rotation = e.Rotation,
-                MeshRefs = meshRefs,
-                EffectCellId = e.EffectCellId,
-                IsBuildingShell = e.IsBuildingShell,  // Phase A8: preserve dat-level tag
-                BuildingShellAnchorCellId = e.BuildingShellAnchorCellId,
-            };
-            if (stabBounds.TryGet(out var sbMin, out var sbMax))
-                entity.SetLocalBounds(sbMin, sbMax);
-            hydrated.Add(entity);
-        }
 
         // Task 8: merge stabs + scenery + interior into one entity list.
         var merged = new List<AcDream.Core.World.WorldEntity>(hydrated);
@@ -226,7 +179,10 @@ public sealed class LandblockBuildFactory
 
         // Pre-read every DAT object publication consumes. Build this after
         // `merged` so all entity GfxObj/Setup ids are known.
-        var physicsDats = BuildPhysicsDatBundle(landblockId, merged);
+        var physicsDats = LandblockPhysicsContentBuilder.BuildDatBundle(
+            _dats,
+            landblockId,
+            merged);
         var completedEnvCells = envCellBuild.Build();
         return new AcDream.App.Streaming.LandblockBuild(
             new AcDream.Core.World.LoadedLandblock(
@@ -237,180 +193,6 @@ public sealed class LandblockBuildFactory
             completedEnvCells,
             request.Origin);
     }
-
-
-
-    /// <summary>
-    /// Pre-reads every DAT object that landblock publication consumes, so the
-    /// update thread performs no DAT reads. Gather and publication must
-    /// enumerate the same identifiers. Reads only; no runtime registration.
-    /// </summary>
-    private AcDream.Core.World.PhysicsDatBundle BuildPhysicsDatBundle(
-        uint landblockId,
-        System.Collections.Generic.IReadOnlyList<AcDream.Core.World.WorldEntity> entities)
-    {
-        var envCells = new System.Collections.Generic.Dictionary<uint, DatReaderWriter.DBObjs.EnvCell>();
-        var environments = new System.Collections.Generic.Dictionary<uint, DatReaderWriter.DBObjs.Environment>();
-        var setups = new System.Collections.Generic.Dictionary<uint, DatReaderWriter.DBObjs.Setup>();
-        var gfxObjs = new System.Collections.Generic.Dictionary<uint, DatReaderWriter.DBObjs.GfxObj>();
-
-        // (1) LandBlockInfo
-        var lbInfo = _dats!.Get<DatReaderWriter.DBObjs.LandBlockInfo>(
-            (landblockId & 0xFFFF0000u) | 0xFFFEu);
-
-        if (lbInfo is not null)
-        {
-            // (2)+(3) EnvCell + Environment, per cell
-            if (lbInfo.NumCells > 0)
-            {
-                uint firstCellId = (landblockId & 0xFFFF0000u) | 0x0100u;
-                for (uint offset = 0; offset < lbInfo.NumCells; offset++)
-                {
-                    uint envCellId = firstCellId + offset;
-                    var envCell = _dats.Get<DatReaderWriter.DBObjs.EnvCell>(envCellId);
-                    if (envCell is null) continue;
-                    envCells[envCellId] = envCell;
-                    if (envCell.EnvironmentId == 0) continue;
-                    uint envId = 0x0D000000u | envCell.EnvironmentId;
-                    if (!environments.ContainsKey(envId))
-                    {
-                        var environment = _dats.Get<DatReaderWriter.DBObjs.Environment>(envId);
-                        if (environment is not null) environments[envId] = environment;
-                    }
-                }
-            }
-
-            // (4) building shell Setup, per building
-            foreach (var building in lbInfo.Buildings)
-            {
-                uint modelId = building.ModelId;
-                if ((modelId & 0xFF000000u) == 0x02000000u && !setups.ContainsKey(modelId))
-                {
-                    var bldSetup = _dats.Get<DatReaderWriter.DBObjs.Setup>(modelId);
-                    if (bldSetup is not null) setups[modelId] = bldSetup;
-                }
-            }
-        }
-
-        // (5)+(6) entity GfxObj (BSP cache) + entity Setup (ShadowObjects parts/lights)
-        foreach (var entity in entities)
-        {
-            uint src = entity.SourceGfxObjOrSetupId;
-            if ((src & 0xFF000000u) == 0x02000000u && !setups.ContainsKey(src))
-            {
-                var s = _dats.Get<DatReaderWriter.DBObjs.Setup>(src);
-                if (s is not null) setups[src] = s;
-            }
-            foreach (var meshRef in entity.MeshRefs)
-            {
-                uint gid = meshRef.GfxObjId;
-                if ((gid & 0xFF000000u) != 0x01000000u) continue;
-                if (gfxObjs.ContainsKey(gid)) continue;
-                var gfx = _dats.Get<DatReaderWriter.DBObjs.GfxObj>(gid);
-                if (gfx is not null) gfxObjs[gid] = gfx;
-            }
-        }
-
-        return new AcDream.Core.World.PhysicsDatBundle(lbInfo, envCells, environments, setups, gfxObjs);
-    }
-
-    /// <summary>
-    /// Reads the exact prepared collision closure after the serialized DAT
-    /// transaction completes. The immutable package is independently
-    /// thread-safe, so these reads never extend the shared DAT-reader lock.
-    /// Missing or corrupt prepared data fails the complete near-tier build;
-    /// production must not publish a graph-only partial generation.
-    /// </summary>
-    private AcDream.Core.World.LandblockCollisionBuild
-        BuildPreparedCollisionClosure(
-            AcDream.Core.World.LoadedLandblock landblock)
-    {
-        AcDream.Core.World.PhysicsDatBundle dats =
-            landblock.PhysicsDats ??
-            AcDream.Core.World.PhysicsDatBundle.Empty;
-        ImmutableArray<uint> gfxObjIds = [.. dats.GfxObjs.Keys.Order()];
-        ImmutableArray<uint> setupIds = [.. dats.Setups.Keys.Order()];
-        ImmutableArray<uint> envCellIds = [.. dats.EnvCells.Keys.Order()];
-        var gfxObjs =
-            ImmutableDictionary.CreateBuilder<
-                uint,
-                AcDream.Core.Physics.FlatGfxObjCollisionAsset>();
-        var setups =
-            ImmutableDictionary.CreateBuilder<
-                uint,
-                AcDream.Core.Physics.FlatSetupCollision>();
-        var cellStructures =
-            ImmutableDictionary.CreateBuilder<
-                uint,
-                AcDream.Core.Physics.FlatCellStructureCollisionAsset>();
-        var envCells =
-            ImmutableDictionary.CreateBuilder<
-                uint,
-                AcDream.Core.Physics.FlatEnvCellTopology>();
-
-        foreach (uint id in gfxObjIds)
-        {
-            gfxObjs.Add(
-                id,
-                RequirePrepared(
-                    _preparedCollisions.ReadGfxObjCollision(id),
-                    "GfxObj collision",
-                    id));
-        }
-
-        foreach (uint id in setupIds)
-        {
-            setups.Add(
-                id,
-                RequirePrepared(
-                    _preparedCollisions.ReadSetupCollision(id),
-                    "Setup collision",
-                    id));
-        }
-
-        foreach (uint id in envCellIds)
-        {
-            cellStructures.Add(
-                id,
-                RequirePrepared(
-                    _preparedCollisions.ReadCellStructureCollision(id),
-                    "CellStruct collision",
-                    id));
-            envCells.Add(
-                id,
-                RequirePrepared(
-                    _preparedCollisions.ReadEnvCellTopology(id),
-                    "EnvCell topology",
-                    id));
-        }
-
-        return new AcDream.Core.World.LandblockCollisionBuild(
-            gfxObjs.ToImmutable(),
-            setups.ToImmutable(),
-            cellStructures.ToImmutable(),
-            envCells.ToImmutable(),
-            gfxObjIds,
-            setupIds,
-            envCellIds);
-    }
-
-    private static T RequirePrepared<T>(
-        PreparedCollisionReadResult<T> result,
-        string kind,
-        uint id)
-        where T : class
-    {
-        if (result.Status == PreparedAssetReadStatus.Loaded &&
-            result.Data is not null)
-        {
-            return result.Data;
-        }
-
-        throw new InvalidDataException(
-            $"{kind} 0x{id:X8} is {result.Status}. " +
-            "The complete near-tier generation cannot be published.");
-    }
-
     /// <summary>
     /// Phase A.1 Task 8: generate scenery (trees, rocks, bushes) for a single
     /// landblock on the worker thread. Pure CPU — no GL calls.

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

@@ -6,6 +6,7 @@ using AcDream.App.Spells;
 using AcDream.Core.Items;
 using AcDream.Core.Selection;
 using AcDream.Core.Spells;
+using AcDream.Content;
 
 namespace AcDream.App.UI.Layout;
 

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

@@ -1,6 +1,7 @@
 using System.Numerics;
 using AcDream.Core.Selection;
 using AcDream.Core.Ui;
+using AcDream.Content;
 
 namespace AcDream.App.UI.Layout;
 

src/AcDream.Content/LandblockPhysicsContentBuilder.cs

@@ -0,0 +1,266 @@
+using System.Collections.Immutable;
+using System.Numerics;
+using AcDream.Core.Meshing;
+using AcDream.Core.Physics;
+using AcDream.Core.World;
+using DatReaderWriter.DBObjs;
+using DatEnvironment = DatReaderWriter.DBObjs.Environment;
+
+namespace AcDream.Content;
+
+/// <summary>
+/// Presentation-independent content half of one near-landblock collision
+/// build. Graphical and no-window hosts consume the same parsed DAT closure,
+/// immutable package collision records, and static Setup/GfxObj identities.
+/// No Runtime world or backend resource is mutated here.
+/// </summary>
+public static class LandblockPhysicsContentBuilder
+{
+    public static IReadOnlyList<WorldEntity> HydrateStaticEntities(
+        IDatReaderWriter dats,
+        LoadedLandblock source,
+        Vector3 worldOffset)
+    {
+        ArgumentNullException.ThrowIfNull(dats);
+        ArgumentNullException.ThrowIfNull(source);
+
+        var hydrated = new List<WorldEntity>(source.Entities.Count);
+        foreach (WorldEntity candidate in source.Entities)
+        {
+            var meshRefs = new List<MeshRef>();
+            var bounds = new LocalBoundsAccumulator();
+            uint sourceId = candidate.SourceGfxObjOrSetupId;
+            if ((sourceId & 0xFF000000u) == 0x01000000u)
+            {
+                GfxObj? gfx = dats.Get<GfxObj>(sourceId);
+                if (gfx is not null)
+                {
+                    (Vector3 Min, Vector3 Max)? partBounds =
+                        GfxObjBounds.Get(gfx);
+                    if (partBounds is not null)
+                    {
+                        bounds.Add(
+                            Matrix4x4.Identity,
+                            partBounds.Value);
+                    }
+                    meshRefs.Add(new MeshRef(
+                        sourceId,
+                        Matrix4x4.Identity));
+                }
+            }
+            else if ((sourceId & 0xFF000000u) == 0x02000000u)
+            {
+                Setup? setup = dats.Get<Setup>(sourceId);
+                if (setup is not null)
+                {
+                    foreach (MeshRef meshRef in SetupMesh.Flatten(setup))
+                    {
+                        GfxObj? gfx =
+                            dats.Get<GfxObj>(meshRef.GfxObjId);
+                        if (gfx is null)
+                            continue;
+                        (Vector3 Min, Vector3 Max)? partBounds =
+                            GfxObjBounds.Get(gfx);
+                        if (partBounds is not null)
+                        {
+                            bounds.Add(
+                                meshRef.PartTransform,
+                                partBounds.Value);
+                        }
+                        meshRefs.Add(meshRef);
+                    }
+                }
+            }
+
+            if (meshRefs.Count == 0)
+                continue;
+
+            var entity = new WorldEntity
+            {
+                Id = candidate.Id,
+                SourceGfxObjOrSetupId = sourceId,
+                Position = candidate.Position + worldOffset,
+                Rotation = candidate.Rotation,
+                MeshRefs = meshRefs,
+                EffectCellId = candidate.EffectCellId,
+                IsBuildingShell = candidate.IsBuildingShell,
+                BuildingShellAnchorCellId =
+                    candidate.BuildingShellAnchorCellId,
+            };
+            if (bounds.TryGet(out Vector3 min, out Vector3 max))
+                entity.SetLocalBounds(min, max);
+            hydrated.Add(entity);
+        }
+        return hydrated;
+    }
+
+    public static PhysicsDatBundle BuildDatBundle(
+        IDatReaderWriter dats,
+        uint landblockId,
+        IReadOnlyList<WorldEntity> entities)
+    {
+        ArgumentNullException.ThrowIfNull(dats);
+        ArgumentNullException.ThrowIfNull(entities);
+
+        var envCells = new Dictionary<uint, EnvCell>();
+        var environments = new Dictionary<uint, DatEnvironment>();
+        var setups = new Dictionary<uint, Setup>();
+        var gfxObjs = new Dictionary<uint, GfxObj>();
+        LandBlockInfo? info = dats.Get<LandBlockInfo>(
+            (landblockId & 0xFFFF0000u) | 0xFFFEu);
+
+        if (info is not null)
+        {
+            uint firstCellId =
+                (landblockId & 0xFFFF0000u) | 0x0100u;
+            for (uint offset = 0; offset < info.NumCells; offset++)
+            {
+                uint envCellId = firstCellId + offset;
+                EnvCell? envCell = dats.Get<EnvCell>(envCellId);
+                if (envCell is null)
+                    continue;
+                envCells[envCellId] = envCell;
+                if (envCell.EnvironmentId == 0)
+                    continue;
+                uint environmentId =
+                    0x0D000000u | envCell.EnvironmentId;
+                if (!environments.ContainsKey(environmentId)
+                    && dats.Get<DatEnvironment>(
+                        environmentId) is { } environment)
+                {
+                    environments[environmentId] = environment;
+                }
+            }
+
+            foreach (var building in info.Buildings)
+            {
+                uint setupId = building.ModelId;
+                if ((setupId & 0xFF000000u) == 0x02000000u
+                    && !setups.ContainsKey(setupId)
+                    && dats.Get<Setup>(setupId) is { } setup)
+                {
+                    setups[setupId] = setup;
+                }
+            }
+        }
+
+        foreach (WorldEntity entity in entities)
+        {
+            uint sourceId = entity.SourceGfxObjOrSetupId;
+            if ((sourceId & 0xFF000000u) == 0x02000000u
+                && !setups.ContainsKey(sourceId)
+                && dats.Get<Setup>(sourceId) is { } setup)
+            {
+                setups[sourceId] = setup;
+            }
+
+            foreach (MeshRef meshRef in entity.MeshRefs)
+            {
+                uint gfxObjId = meshRef.GfxObjId;
+                if ((gfxObjId & 0xFF000000u) != 0x01000000u
+                    || gfxObjs.ContainsKey(gfxObjId))
+                {
+                    continue;
+                }
+                if (dats.Get<GfxObj>(gfxObjId) is { } gfxObj)
+                    gfxObjs[gfxObjId] = gfxObj;
+            }
+        }
+
+        return new PhysicsDatBundle(
+            info,
+            envCells,
+            environments,
+            setups,
+            gfxObjs);
+    }
+
+    public static LandblockCollisionBuild BuildPreparedCollisionClosure(
+        IPreparedCollisionSource source,
+        LoadedLandblock landblock)
+    {
+        ArgumentNullException.ThrowIfNull(source);
+        ArgumentNullException.ThrowIfNull(landblock);
+
+        PhysicsDatBundle dats =
+            landblock.PhysicsDats ?? PhysicsDatBundle.Empty;
+        ImmutableArray<uint> gfxObjIds =
+            [.. dats.GfxObjs.Keys.Order()];
+        ImmutableArray<uint> setupIds =
+            [.. dats.Setups.Keys.Order()];
+        ImmutableArray<uint> envCellIds =
+            [.. dats.EnvCells.Keys.Order()];
+        var gfxObjs = ImmutableDictionary.CreateBuilder<
+            uint,
+            FlatGfxObjCollisionAsset>();
+        var setups = ImmutableDictionary.CreateBuilder<
+            uint,
+            FlatSetupCollision>();
+        var cellStructures = ImmutableDictionary.CreateBuilder<
+            uint,
+            FlatCellStructureCollisionAsset>();
+        var envCells = ImmutableDictionary.CreateBuilder<
+            uint,
+            FlatEnvCellTopology>();
+
+        foreach (uint id in gfxObjIds)
+        {
+            gfxObjs.Add(
+                id,
+                Require(
+                    source.ReadGfxObjCollision(id),
+                    "GfxObj collision",
+                    id));
+        }
+        foreach (uint id in setupIds)
+        {
+            setups.Add(
+                id,
+                Require(
+                    source.ReadSetupCollision(id),
+                    "Setup collision",
+                    id));
+        }
+        foreach (uint id in envCellIds)
+        {
+            cellStructures.Add(
+                id,
+                Require(
+                    source.ReadCellStructureCollision(id),
+                    "CellStruct collision",
+                    id));
+            envCells.Add(
+                id,
+                Require(
+                    source.ReadEnvCellTopology(id),
+                    "EnvCell topology",
+                    id));
+        }
+
+        return new LandblockCollisionBuild(
+            gfxObjs.ToImmutable(),
+            setups.ToImmutable(),
+            cellStructures.ToImmutable(),
+            envCells.ToImmutable(),
+            gfxObjIds,
+            setupIds,
+            envCellIds);
+    }
+
+    private static T Require<T>(
+        PreparedCollisionReadResult<T> result,
+        string kind,
+        uint id)
+        where T : class
+    {
+        if (result.Status == PreparedAssetReadStatus.Loaded
+            && result.Data is not null)
+        {
+            return result.Data;
+        }
+
+        throw new InvalidDataException(
+            $"{kind} 0x{id:X8} is {result.Status}. "
+            + "The complete near-tier generation cannot be published.");
+    }
+}

src/AcDream.Content/MagicCatalog.cs

@@ -0,0 +1,192 @@
+using System.Collections.Frozen;
+using AcDream.Core.Items;
+using AcDream.Core.Spells;
+using DatReaderWriter;
+using DatReaderWriter.DBObjs;
+using CoreSpellTable = AcDream.Core.Spells.SpellTable;
+
+namespace AcDream.Content;
+
+/// <summary>
+/// Immutable presentation and gameplay metadata for one retail spell
+/// component WCID.
+/// </summary>
+public sealed record SpellComponentDescriptor(
+    uint WeenieClassId,
+    string Name,
+    uint Category,
+    uint IconId);
+
+/// <summary>
+/// Process-shareable projection of retail's spell, component, and
+/// school-focus DAT tables. The catalog contains no player, inventory,
+/// session, or presentation state.
+/// </summary>
+public sealed class MagicCatalog
+{
+    private const uint SpellTableDid = 0x0E00000Eu;
+    private const uint SpellComponentTableDid = 0x0E00000Fu;
+    private const uint ComponentIdMapDid = 0x27000002u;
+
+    private readonly FrozenDictionary<uint, SpellFormulaDefinition>
+        _formulaDefinitions;
+    private readonly FrozenDictionary<uint, uint> _wcidByScid;
+    private readonly FrozenDictionary<uint, uint> _magicPackWcidBySchool;
+    private readonly FrozenDictionary<uint, int> _spellLevels;
+
+    private MagicCatalog(
+        CoreSpellTable spellTable,
+        FrozenDictionary<uint, SpellComponentDescriptor> components,
+        FrozenDictionary<uint, SpellFormulaDefinition> formulaDefinitions,
+        FrozenDictionary<uint, uint> wcidByScid,
+        FrozenDictionary<uint, uint> magicPackWcidBySchool,
+        FrozenDictionary<uint, int> spellLevels)
+    {
+        SpellTable = spellTable;
+        Components = components;
+        _formulaDefinitions = formulaDefinitions;
+        _wcidByScid = wcidByScid;
+        _magicPackWcidBySchool = magicPackWcidBySchool;
+        _spellLevels = spellLevels;
+    }
+
+    public static MagicCatalog Empty { get; } = new(
+        CoreSpellTable.Empty,
+        EmptyFrozen<SpellComponentDescriptor>(),
+        EmptyFrozen<SpellFormulaDefinition>(),
+        EmptyFrozen<uint>(),
+        EmptyFrozen<uint>(),
+        EmptyFrozen<int>());
+
+    public CoreSpellTable SpellTable { get; }
+    public IReadOnlyDictionary<uint, SpellComponentDescriptor> Components
+    {
+        get;
+    }
+
+    public bool TryGetComponentBySpellComponentId(
+        uint spellComponentId,
+        out SpellComponentDescriptor descriptor)
+    {
+        if (_wcidByScid.TryGetValue(
+                spellComponentId,
+                out uint weenieClassId)
+            && Components.TryGetValue(
+                weenieClassId,
+                out SpellComponentDescriptor? found))
+        {
+            descriptor = found;
+            return true;
+        }
+        descriptor = null!;
+        return false;
+    }
+
+    public bool IsComponentPack(uint weenieClassId) =>
+        Components.ContainsKey(weenieClassId);
+
+    public int GetSpellLevel(uint spellId) =>
+        _spellLevels.TryGetValue(spellId, out int level)
+            ? level
+            : 0;
+
+    /// <summary>
+    /// Creates the per-session policy view over this immutable catalog. The
+    /// returned service borrows only the supplied session's object table and
+    /// identity/account delegates.
+    /// </summary>
+    public SpellComponentRequirementService CreateRequirementService(
+        ClientObjectTable objects,
+        Func<uint> playerGuid,
+        Func<string> accountName) =>
+        new(
+            objects,
+            playerGuid,
+            accountName,
+            _formulaDefinitions,
+            _wcidByScid,
+            _magicPackWcidBySchool);
+
+    public static MagicCatalog Load(IDatReaderWriter dats)
+    {
+        ArgumentNullException.ThrowIfNull(dats);
+
+        var components =
+            new Dictionary<uint, SpellComponentDescriptor>();
+        var wcidByScid = new Dictionary<uint, uint>();
+        SpellComponentTable? componentTable =
+            dats.Get<SpellComponentTable>(SpellComponentTableDid);
+        DualEnumIDMap? componentIds =
+            dats.Get<DualEnumIDMap>(ComponentIdMapDid);
+        if (componentTable is not null && componentIds is not null)
+        {
+            foreach (var pair in componentTable.Components)
+            {
+                if (!componentIds.ClientEnumToID.TryGetValue(
+                        pair.Key,
+                        out uint wcid))
+                {
+                    continue;
+                }
+
+                wcidByScid[pair.Key] = wcid;
+                components[wcid] = new SpellComponentDescriptor(
+                    wcid,
+                    pair.Value.Name.Value,
+                    pair.Value.Category,
+                    pair.Value.Icon.DataId);
+            }
+        }
+
+        var metadata = new List<SpellMetadata>();
+        var formulaDefinitions =
+            new Dictionary<uint, SpellFormulaDefinition>();
+        var spellLevels = new Dictionary<uint, int>();
+        DatReaderWriter.DBObjs.SpellTable spellTable =
+            dats.Get<DatReaderWriter.DBObjs.SpellTable>(SpellTableDid)
+            ?? throw new InvalidOperationException(
+                $"Required retail SpellTable 0x{SpellTableDid:X8} is missing from portal.dat.");
+        foreach (var pair in spellTable.Spells)
+        {
+            SpellMetadata spell = RetailSpellMetadataProjector.Project(
+                pair.Key,
+                pair.Value,
+                componentTable);
+            metadata.Add(spell);
+            uint[] formula = spell.FormulaComponents.ToArray();
+            formulaDefinitions[pair.Key] = new SpellFormulaDefinition(
+                spell.FormulaVersion,
+                formula,
+                (uint)spell.SchoolId);
+            spellLevels[pair.Key] = spell.Generation;
+        }
+
+        var magicPackWcidBySchool = new Dictionary<uint, uint>();
+        // Retail IsComponentPack resolves enum key 0x10000001 in category
+        // 0x28; that key is not itself a portal.dat file id.
+        uint magicPackMapDid = RetailDataIdResolver.Resolve(
+            dats,
+            0x10000001u,
+            0x28u);
+        if (magicPackMapDid != 0u
+            && dats.Portal.TryGet<EnumIDMap>(
+                magicPackMapDid,
+                out EnumIDMap? magicPackMap)
+            && magicPackMap is not null)
+        {
+            foreach (var pair in magicPackMap.ClientEnumToID)
+                magicPackWcidBySchool[pair.Key] = pair.Value;
+        }
+
+        return new MagicCatalog(
+            CoreSpellTable.Create(metadata),
+            components.ToFrozenDictionary(),
+            formulaDefinitions.ToFrozenDictionary(),
+            wcidByScid.ToFrozenDictionary(),
+            magicPackWcidBySchool.ToFrozenDictionary(),
+            spellLevels.ToFrozenDictionary());
+    }
+
+    private static FrozenDictionary<uint, TValue> EmptyFrozen<TValue>() =>
+        new Dictionary<uint, TValue>().ToFrozenDictionary();
+}

src/AcDream.Content/RetailDataIdResolver.cs

@@ -1,8 +1,7 @@
 using DatReaderWriter;
-using AcDream.Content;
 using DatReaderWriter.DBObjs;
 
-namespace AcDream.App.UI;
+namespace AcDream.Content;
 
 /// <summary>
 /// Ports <c>DBCache::GetDIDFromEnumStatic @ 0x00413940</c>: the portal master map

src/AcDream.Content/RuntimeDatCollectionFactory.cs

@@ -45,7 +45,7 @@ public sealed class RuntimeDatCollection : IDatReaderWriter
 {
     private readonly DatCollection _raw;
     private readonly DatCollectionAdapter _bounded;
-    private bool _disposed;
+    private int _disposeStage;
 
     internal RuntimeDatCollection(DatCollection raw)
     {
@@ -95,11 +95,22 @@ public sealed class RuntimeDatCollection : IDatReaderWriter
 
     public void Dispose()
     {
-        if (_disposed)
+        while (_disposeStage < 2)
-            return;
+        {
-
+            switch (_disposeStage)
-        _disposed = true;
+            {
-        _bounded.Dispose();
+                case 0:
-        _raw.Dispose();
+                    _bounded.Dispose();
+                    _disposeStage++;
+                    break;
+                case 1:
+                    _raw.Dispose();
+                    _disposeStage++;
+                    break;
+                default:
+                    throw new InvalidOperationException(
+                        "Unknown DAT owner teardown stage.");
+            }
+        }
     }
 }

src/AcDream.Content/SharedPreparedCollisionCache.cs

@@ -0,0 +1,245 @@
+using AcDream.Content.Pak;
+using AcDream.Core.Physics;
+
+namespace AcDream.Content;
+
+public readonly record struct SharedPreparedCollisionCacheSnapshot(
+    int Count,
+    int Capacity,
+    long Hits,
+    long Misses,
+    bool IsDisposed)
+{
+    public bool IsBounded => Count >= 0 && Count <= Capacity;
+}
+
+/// <summary>
+/// Process-scoped bounded cache over immutable prepared collision payloads.
+/// The wrapped package remains owned by the caller; disposing this cache only
+/// retires its decoded references. Sessions retain separate
+/// <see cref="PhysicsDataCache"/> instances and share only these immutable
+/// values.
+/// </summary>
+public sealed class SharedPreparedCollisionCache
+    : IPreparedCollisionSource
+{
+    public const int DefaultCapacity = 4096;
+
+    private readonly object _gate = new();
+    private readonly IPreparedCollisionSource _source;
+    private readonly int _capacity;
+    private readonly Dictionary<CacheKey, LinkedListNode<CacheEntry>>
+        _entries = new();
+    private readonly LinkedList<CacheEntry> _lru = new();
+    private long _probes;
+    private long _reads;
+    private long _loaded;
+    private long _missing;
+    private long _corrupt;
+    private long _hits;
+    private long _misses;
+    private bool _disposed;
+
+    public SharedPreparedCollisionCache(
+        IPreparedCollisionSource source,
+        int capacity = DefaultCapacity)
+    {
+        _source = source ?? throw new ArgumentNullException(nameof(source));
+        if (capacity <= 0)
+            throw new ArgumentOutOfRangeException(nameof(capacity));
+        _capacity = capacity;
+    }
+
+    public PreparedCollisionSourceStats CollisionStats => new(
+        Interlocked.Read(ref _probes),
+        Interlocked.Read(ref _reads),
+        Interlocked.Read(ref _loaded),
+        Interlocked.Read(ref _missing),
+        Interlocked.Read(ref _corrupt));
+
+    public SharedPreparedCollisionCacheSnapshot CaptureSnapshot()
+    {
+        lock (_gate)
+        {
+            return new SharedPreparedCollisionCacheSnapshot(
+                _entries.Count,
+                _capacity,
+                Interlocked.Read(ref _hits),
+                Interlocked.Read(ref _misses),
+                _disposed);
+        }
+    }
+
+    public PreparedAssetPresence ProbeCollision(
+        PakAssetType type,
+        uint sourceFileId)
+    {
+        PreparedCollisionTypeContract.Validate(type);
+        Interlocked.Increment(ref _probes);
+        lock (_gate)
+        {
+            EnsureNotDisposed();
+            if (_entries.TryGetValue(
+                    new CacheKey(type, sourceFileId),
+                    out LinkedListNode<CacheEntry>? node))
+            {
+                Touch(node);
+                return node.Value.Status switch
+                {
+                    PreparedAssetReadStatus.Loaded =>
+                        PreparedAssetPresence.Available,
+                    PreparedAssetReadStatus.Corrupt =>
+                        PreparedAssetPresence.Corrupt,
+                    _ => PreparedAssetPresence.Missing,
+                };
+            }
+            return _source.ProbeCollision(type, sourceFileId);
+        }
+    }
+
+    public PreparedCollisionReadResult<FlatGfxObjCollisionAsset>
+        ReadGfxObjCollision(
+            uint sourceFileId,
+            CancellationToken cancellationToken = default) =>
+        Read(
+            PakAssetType.GfxObjCollision,
+            sourceFileId,
+            token => _source.ReadGfxObjCollision(sourceFileId, token),
+            cancellationToken);
+
+    public PreparedCollisionReadResult<FlatSetupCollision>
+        ReadSetupCollision(
+            uint sourceFileId,
+            CancellationToken cancellationToken = default) =>
+        Read(
+            PakAssetType.SetupCollision,
+            sourceFileId,
+            token => _source.ReadSetupCollision(sourceFileId, token),
+            cancellationToken);
+
+    public PreparedCollisionReadResult<FlatCellStructureCollisionAsset>
+        ReadCellStructureCollision(
+            uint sourceFileId,
+            CancellationToken cancellationToken = default) =>
+        Read(
+            PakAssetType.CellStructureCollision,
+            sourceFileId,
+            token => _source.ReadCellStructureCollision(
+                sourceFileId,
+                token),
+            cancellationToken);
+
+    public PreparedCollisionReadResult<FlatEnvCellTopology>
+        ReadEnvCellTopology(
+            uint sourceFileId,
+            CancellationToken cancellationToken = default) =>
+        Read(
+            PakAssetType.EnvCellTopology,
+            sourceFileId,
+            token => _source.ReadEnvCellTopology(sourceFileId, token),
+            cancellationToken);
+
+    public void Dispose()
+    {
+        lock (_gate)
+        {
+            if (_disposed)
+                return;
+            _entries.Clear();
+            _lru.Clear();
+            _disposed = true;
+        }
+    }
+
+    private PreparedCollisionReadResult<T> Read<T>(
+        PakAssetType type,
+        uint sourceFileId,
+        Func<CancellationToken, PreparedCollisionReadResult<T>> loader,
+        CancellationToken cancellationToken)
+        where T : class
+    {
+        cancellationToken.ThrowIfCancellationRequested();
+        Interlocked.Increment(ref _reads);
+        lock (_gate)
+        {
+            EnsureNotDisposed();
+            var key = new CacheKey(type, sourceFileId);
+            if (_entries.TryGetValue(
+                    key,
+                    out LinkedListNode<CacheEntry>? node))
+            {
+                Touch(node);
+                Interlocked.Increment(ref _hits);
+                return CountAndConvert<T>(node.Value);
+            }
+
+            Interlocked.Increment(ref _misses);
+            PreparedCollisionReadResult<T> loaded =
+                loader(cancellationToken);
+            cancellationToken.ThrowIfCancellationRequested();
+            var entry = new CacheEntry(
+                key,
+                loaded.Status,
+                loaded.Data);
+            LinkedListNode<CacheEntry> added = _lru.AddFirst(entry);
+            _entries.Add(key, added);
+            Trim();
+            return CountAndConvert<T>(entry);
+        }
+    }
+
+    private PreparedCollisionReadResult<T> CountAndConvert<T>(
+        CacheEntry entry)
+        where T : class
+    {
+        switch (entry.Status)
+        {
+            case PreparedAssetReadStatus.Loaded
+                when entry.Data is T data:
+                Interlocked.Increment(ref _loaded);
+                return PreparedCollisionReadResult<T>.Loaded(data);
+            case PreparedAssetReadStatus.Missing:
+                Interlocked.Increment(ref _missing);
+                return PreparedCollisionReadResult<T>.Missing;
+            case PreparedAssetReadStatus.Corrupt:
+                Interlocked.Increment(ref _corrupt);
+                return PreparedCollisionReadResult<T>.Corrupt;
+            default:
+                throw new InvalidDataException(
+                    $"Prepared collision cache entry {entry.Key} has an invalid payload.");
+        }
+    }
+
+    private void Touch(LinkedListNode<CacheEntry> node)
+    {
+        if (ReferenceEquals(_lru.First, node))
+            return;
+        _lru.Remove(node);
+        _lru.AddFirst(node);
+    }
+
+    private void Trim()
+    {
+        while (_entries.Count > _capacity)
+        {
+            LinkedListNode<CacheEntry> tail =
+                _lru.Last
+                ?? throw new InvalidOperationException(
+                    "Prepared collision LRU lost its terminal entry.");
+            _entries.Remove(tail.Value.Key);
+            _lru.RemoveLast();
+        }
+    }
+
+    private void EnsureNotDisposed() =>
+        ObjectDisposedException.ThrowIf(_disposed, this);
+
+    private readonly record struct CacheKey(
+        PakAssetType Type,
+        uint SourceFileId);
+
+    private sealed record CacheEntry(
+        CacheKey Key,
+        PreparedAssetReadStatus Status,
+        object? Data);
+}

src/AcDream.Content/Spells/RetailSpellMetadataProjector.cs

@@ -8,7 +8,7 @@ using DatReaderWriter.Enums;
 using DatReaderWriter.Types;
 using CoreMagicSchool = AcDream.Core.Spells.MagicSchool;
 
-namespace AcDream.App.Spells;
+namespace AcDream.Content;
 
 /// <summary>
 /// Projects portal.dat's complete retail <see cref="SpellBase"/> record into
@@ -19,7 +19,7 @@ namespace AcDream.App.Spells;
 /// School names: <c>CSpellBase::SchoolEnumToName @ 0x00597400</c>.
 /// Target type: <c>SpellFormula::GetTargetingType @ 0x005BC910</c>.
 /// </remarks>
-internal static class RetailSpellMetadataProjector
+public static class RetailSpellMetadataProjector
 {
     public static SpellMetadata Project(
         uint spellId,

src/AcDream.Core/Spells/SpellComponentRequirementService.cs

@@ -2,9 +2,8 @@ using System;
 using System.Collections.Generic;
 using System.Linq;
 using AcDream.Core.Items;
-using AcDream.Core.Spells;
 
-namespace AcDream.App.Spells;
+namespace AcDream.Core.Spells;
 
 public sealed record SpellFormulaDefinition(
     uint FormulaVersion,

src/AcDream.Core/Spells/SpellTable.cs

@@ -7,7 +7,8 @@ namespace AcDream.Core.Spells;
 
 /// <summary>
 /// Immutable lookup of retail spell metadata. Production builds create this
-/// table from portal.dat through the App-layer <c>MagicCatalog</c>. The CSV
+/// table from portal.dat through Content's process-shareable
+/// <c>MagicCatalog</c>. The CSV
 /// parser below remains for historical tooling and small synthetic tests.
 ///
 /// <para>

src/AcDream.Headless/Hosting/HeadlessGameplayOperations.cs

@@ -2,6 +2,7 @@ using AcDream.Core.Combat;
 using AcDream.Core.Items;
 using AcDream.Core.Net;
 using AcDream.Core.Spells;
+using AcDream.Content;
 using AcDream.Runtime;
 using AcDream.Runtime.Gameplay;
 using AcDream.Runtime.Session;
@@ -43,12 +44,29 @@ internal sealed class HeadlessGameplayOperations
 
     private readonly object _gate = new();
     private GameRuntime? _runtime;
+    private SpellComponentRequirementService? _componentRequirements;
     private WorldSession? _session;
     private SessionRoute? _route;
 
-    internal void Bind(GameRuntime runtime) =>
+    internal void Bind(
-        _runtime = runtime
+        GameRuntime runtime,
-            ?? throw new ArgumentNullException(nameof(runtime));
+        MagicCatalog? catalog,
+        Func<string> accountName)
+    {
+        ArgumentNullException.ThrowIfNull(runtime);
+        ArgumentNullException.ThrowIfNull(accountName);
+        if (_runtime is not null)
+        {
+            throw new InvalidOperationException(
+                "Headless gameplay operations are already bound.");
+        }
+
+        _runtime = runtime;
+        _componentRequirements = catalog?.CreateRequirementService(
+            runtime.InventoryOwner.Objects,
+            () => runtime.PlayerIdentity.ServerGuid,
+            accountName);
+    }
 
     internal ILiveSessionCommandRouting CreateRoute(
         WorldSession session)
@@ -151,12 +169,16 @@ internal sealed class HeadlessGameplayOperations
 
     public bool HasRequiredComponents(uint spellId)
     {
+        if (_componentRequirements is { } requirements)
+            return requirements.HasRequiredComponents(spellId);
+
         GameRuntime runtime = RequireRuntime();
         ClientObject? player = runtime.InventoryOwner.Objects.Get(
             runtime.PlayerIdentity.ServerGuid);
         return player is not null
             && !player.Properties.GetBool(
-                SpellComponentsRequiredProperty,
+                SpellComponentRequirementService
+                    .SpellComponentsRequiredProperty,
                 true);
     }
 
@@ -264,6 +286,4 @@ internal sealed class HeadlessGameplayOperations
             _route = null;
         }
     }
-
-    private const uint SpellComponentsRequiredProperty = 68u;
 }

src/AcDream.Headless/Hosting/HeadlessProcessContentOwner.cs

@@ -17,15 +17,20 @@ internal readonly record struct HeadlessProcessContentSnapshot(
 
 internal interface IHeadlessProcessContentFactory
 {
-    (IDatReaderWriter Dats, IPreparedAssetSource Prepared) Open(
+    HeadlessOpenedProcessContent Open(
         HeadlessContentDescriptor descriptor,
         Action<string> diagnostic);
 }
 
+internal sealed record HeadlessOpenedProcessContent(
+    IDatReaderWriter Dats,
+    IPreparedAssetSource Prepared,
+    MagicCatalog Magic);
+
 internal sealed class ProductionHeadlessProcessContentFactory
     : IHeadlessProcessContentFactory
 {
-    public (IDatReaderWriter Dats, IPreparedAssetSource Prepared) Open(
+    public HeadlessOpenedProcessContent Open(
         HeadlessContentDescriptor descriptor,
         Action<string> diagnostic)
     {
@@ -36,18 +41,30 @@ internal sealed class ProductionHeadlessProcessContentFactory
         string preparedAssetPath =
             Path.GetFullPath(descriptor.PreparedAssetPath);
         IDatReaderWriter? dats = null;
+        IPreparedAssetSource? prepared = null;
         try
         {
             dats = RuntimeDatCollectionFactory.OpenReadOnly(datDirectory);
-            var prepared = new PakPreparedAssetSource(
+            prepared = new PakPreparedAssetSource(
                 preparedAssetPath,
                 dats,
                 diagnostic);
-            return (dats, prepared);
+            MagicCatalog magic = MagicCatalog.Load(dats);
+            return new HeadlessOpenedProcessContent(
+                dats,
+                prepared,
+                magic);
         }
         catch
         {
-            dats?.Dispose();
+            try
+            {
+                prepared?.Dispose();
+            }
+            finally
+            {
+                dats?.Dispose();
+            }
             throw;
         }
     }
@@ -62,8 +79,10 @@ internal sealed class ProductionHeadlessProcessContentFactory
 internal sealed class HeadlessProcessContentOwner : IDisposable
 {
     private readonly object _gate = new();
+    private readonly MagicCatalog _magic;
     private IDatReaderWriter? _dats;
     private IPreparedAssetSource? _prepared;
+    private SharedPreparedCollisionCache? _collision;
     private int _leaseCount;
     private bool _disposeRequested;
     private bool _disposed;
@@ -75,30 +94,41 @@ internal sealed class HeadlessProcessContentOwner : IDisposable
     {
         ArgumentNullException.ThrowIfNull(descriptor);
         ArgumentNullException.ThrowIfNull(diagnostic);
-        (IDatReaderWriter dats, IPreparedAssetSource prepared) =
+        HeadlessOpenedProcessContent? opened =
             (factory ?? new ProductionHeadlessProcessContentFactory())
                 .Open(descriptor, diagnostic);
-        _dats = dats
+        if (opened is null)
-            ?? throw new InvalidOperationException(
+        {
-                "The headless content factory returned no DAT owner.");
+            throw new InvalidOperationException(
-        _prepared = prepared
+                "The headless content factory returned no content owner.");
-            ?? throw new InvalidOperationException(
+        }
-                "The headless content factory returned no prepared source.");
+        IDatReaderWriter? dats = opened.Dats;
-        if (prepared is not IPreparedCollisionSource)
+        IPreparedAssetSource? prepared = opened.Prepared;
+        MagicCatalog? magic = opened.Magic;
+        bool incomplete =
+            dats is null || prepared is null || magic is null;
+        if (incomplete || prepared is not IPreparedCollisionSource)
         {
             try
             {
-                prepared.Dispose();
+                prepared?.Dispose();
             }
             finally
             {
-                dats.Dispose();
+                dats?.Dispose();
             }
-            _prepared = null;
+            throw !incomplete
-            _dats = null;
+                && prepared is not IPreparedCollisionSource
-            throw new NotSupportedException(
+                ? new NotSupportedException(
-                "Headless production content must expose prepared collision.");
+                    "Headless production content must expose prepared collision.")
+                : new InvalidOperationException(
+                    "The headless content factory returned an incomplete owner.");
         }
+        _dats = dats!;
+        _prepared = prepared!;
+        _magic = magic!;
+        _collision = new SharedPreparedCollisionCache(
+            (IPreparedCollisionSource)prepared!);
     }
 
     internal HeadlessProcessContentLease AcquireLease(string sessionId)
@@ -117,7 +147,9 @@ internal sealed class HeadlessProcessContentOwner : IDisposable
                 this,
                 sessionId,
                 _dats!,
-                _prepared!);
+                _prepared!,
+                _collision!,
+                _magic);
         }
     }
 
@@ -163,6 +195,11 @@ internal sealed class HeadlessProcessContentOwner : IDisposable
 
     private void DrainResources()
     {
+        if (_collision is not null)
+        {
+            _collision.Dispose();
+            _collision = null;
+        }
         if (_prepared is not null)
         {
             _prepared.Dispose();
@@ -181,17 +218,23 @@ internal sealed class HeadlessProcessContentOwner : IDisposable
         private HeadlessProcessContentOwner? _owner;
         private readonly IDatReaderWriter _dats;
         private readonly IPreparedAssetSource _prepared;
+        private readonly IPreparedCollisionSource _collision;
+        private readonly MagicCatalog _magic;
 
         internal HeadlessProcessContentLease(
             HeadlessProcessContentOwner owner,
             string sessionId,
             IDatReaderWriter dats,
-            IPreparedAssetSource prepared)
+            IPreparedAssetSource prepared,
+            IPreparedCollisionSource collision,
+            MagicCatalog magic)
         {
             _owner = owner;
             SessionId = sessionId;
             _dats = dats;
             _prepared = prepared;
+            _collision = collision;
+            _magic = magic;
         }
 
         internal string SessionId { get; }
@@ -214,8 +257,23 @@ internal sealed class HeadlessProcessContentOwner : IDisposable
             }
         }
 
-        internal IPreparedCollisionSource PreparedCollision =>
+        internal IPreparedCollisionSource PreparedCollision
-            (IPreparedCollisionSource)PreparedAssets;
+        {
+            get
+            {
+                ObjectDisposedException.ThrowIf(_owner is null, this);
+                return _collision;
+            }
+        }
+
+        internal MagicCatalog MagicCatalog
+        {
+            get
+            {
+                ObjectDisposedException.ThrowIf(_owner is null, this);
+                return _magic;
+            }
+        }
 
         public void Dispose()
         {

src/AcDream.Headless/Hosting/HeadlessSessionHost.cs

@@ -123,6 +123,7 @@ internal sealed class HeadlessSessionHost : IDisposable
     private long _reconnectDeadline;
     private bool _reconnectPending;
     private ulong _stoppedGeneration;
+    private string _accountName = string.Empty;
     private bool _disposed;
 
     internal HeadlessSessionHost(
@@ -172,7 +173,15 @@ internal sealed class HeadlessSessionHost : IDisposable
                 CombatTime: () =>
                     runtimeRef?.Clock.SimulationTimeSeconds ?? 0d));
             runtimeRef = runtime;
-            gameplay.Bind(runtime);
+            if (contentLease is { } content)
+            {
+                runtime.CharacterOwner.InstallSpellMetadata(
+                    content.MagicCatalog.SpellTable);
+            }
+            gameplay.Bind(
+                runtime,
+                contentLease?.MagicCatalog,
+                () => _accountName);
 
             var bridge = new SessionCommandBridge();
             var commands = new DirectGameRuntimeCommandAdapter(
@@ -448,6 +457,8 @@ internal sealed class HeadlessSessionHost : IDisposable
                 password,
                 MapCharacterSelector(_descriptor.Character));
             LiveSessionStartResult result = _liveSession.Start(options);
+            if (result.Selection is { } selection)
+                _accountName = selection.AccountName;
             RuntimeSessionStartResult converted = Convert(result);
             if (converted.Error is { } error)
             {

tests/AcDream.App.Tests/Composition/InteractionRetainedUiCompositionTests.cs

@@ -4,6 +4,7 @@ using AcDream.App.Composition;
 using AcDream.App.Diagnostics;
 using AcDream.App.Rendering;
 using AcDream.App.Spells;
+using AcDream.Content;
 using AcDream.App.UI;
 using AcDream.App.UI.Layout;
 using AcDream.App.World;

tests/AcDream.App.Tests/Rendering/PortalTunnelAssetTests.cs

@@ -1,5 +1,6 @@
 using AcDream.App.Rendering;
 using AcDream.App.UI;
+using AcDream.Content;
 using AcDream.Content.Vfx;
 using AcDream.Core.World;
 using DatReaderWriter;

tests/AcDream.App.Tests/Rendering/RetailSelectionAssetTests.cs

@@ -2,6 +2,7 @@ using System.Numerics;
 using AcDream.App.Rendering;
 using AcDream.App.Rendering.Selection;
 using AcDream.App.UI;
+using AcDream.Content;
 using AcDream.Core.Textures;
 using AcDream.Core.Selection;
 using DatReaderWriter;

tests/AcDream.App.Tests/UI/Layout/AppraisalUiControllerTests.cs

@@ -1,5 +1,6 @@
 using System.Numerics;
 using AcDream.App.Spells;
+using AcDream.Content;
 using AcDream.App.UI;
 using AcDream.App.UI.Layout;
 using AcDream.Core.Combat;

tests/AcDream.App.Tests/UI/Layout/SpellbookWindowControllerTests.cs

@@ -1,4 +1,5 @@
 using AcDream.App.Spells;
+using AcDream.Content;
 using AcDream.App.UI;
 using AcDream.App.UI.Layout;
 using AcDream.Core.Items;

tests/AcDream.Content.Tests/SharedPreparedCollisionCacheTests.cs

@@ -0,0 +1,143 @@
+using System.Collections.Immutable;
+using AcDream.Content.Pak;
+using AcDream.Core.Physics;
+
+namespace AcDream.Content.Tests;
+
+public sealed class SharedPreparedCollisionCacheTests
+{
+    [Fact]
+    public void LoadedPayloadIsSharedByReferenceAndLeastRecentlyUsedIsBounded()
+    {
+        var source = new FixtureSource();
+        using var cache = new SharedPreparedCollisionCache(
+            source,
+            capacity: 2);
+
+        FlatSetupCollision first =
+            Assert.IsType<FlatSetupCollision>(
+                cache.ReadSetupCollision(1u).Data);
+        Assert.Same(
+            first,
+            cache.ReadSetupCollision(1u).Data);
+        _ = cache.ReadSetupCollision(2u);
+        Assert.Same(
+            first,
+            cache.ReadSetupCollision(1u).Data);
+        _ = cache.ReadSetupCollision(3u);
+
+        SharedPreparedCollisionCacheSnapshot snapshot =
+            cache.CaptureSnapshot();
+        Assert.Equal(2, snapshot.Count);
+        Assert.True(snapshot.IsBounded);
+        Assert.Equal(2, snapshot.Hits);
+        Assert.Equal(3, snapshot.Misses);
+        Assert.Equal(1, source.SetupReads[1u]);
+        Assert.Equal(1, source.SetupReads[2u]);
+
+        _ = cache.ReadSetupCollision(2u);
+
+        Assert.Equal(2, source.SetupReads[2u]);
+        Assert.True(cache.CaptureSnapshot().IsBounded);
+    }
+
+    [Fact]
+    public void TypeParticipatesInIdentityAndDisposeDoesNotOwnPackage()
+    {
+        var source = new FixtureSource();
+        var cache = new SharedPreparedCollisionCache(source, capacity: 4);
+
+        FlatSetupCollision setup =
+            Assert.IsType<FlatSetupCollision>(
+                cache.ReadSetupCollision(7u).Data);
+        FlatGfxObjCollisionAsset gfx =
+            Assert.IsType<FlatGfxObjCollisionAsset>(
+                cache.ReadGfxObjCollision(7u).Data);
+
+        Assert.NotSame(setup, gfx);
+        Assert.Equal(1, source.SetupReads[7u]);
+        Assert.Equal(1, source.GfxReads[7u]);
+
+        cache.Dispose();
+
+        Assert.False(source.IsDisposed);
+        Assert.True(cache.CaptureSnapshot().IsDisposed);
+        Assert.Throws<ObjectDisposedException>(
+            () => cache.ReadSetupCollision(7u));
+    }
+
+    private sealed class FixtureSource : IPreparedCollisionSource
+    {
+        internal Dictionary<uint, int> SetupReads { get; } = new();
+        internal Dictionary<uint, int> GfxReads { get; } = new();
+        internal bool IsDisposed { get; private set; }
+
+        public PreparedCollisionSourceStats CollisionStats => default;
+
+        public PreparedAssetPresence ProbeCollision(
+            PakAssetType type,
+            uint sourceFileId) =>
+            PreparedAssetPresence.Available;
+
+        public PreparedCollisionReadResult<FlatGfxObjCollisionAsset>
+            ReadGfxObjCollision(
+                uint sourceFileId,
+                CancellationToken cancellationToken = default)
+        {
+            cancellationToken.ThrowIfCancellationRequested();
+            Increment(GfxReads, sourceFileId);
+            return PreparedCollisionReadResult<
+                FlatGfxObjCollisionAsset>.Loaded(
+                new FlatGfxObjCollisionAsset(
+                    EmptyPhysicsBsp(),
+                    null,
+                    null));
+        }
+
+        public PreparedCollisionReadResult<FlatSetupCollision>
+            ReadSetupCollision(
+                uint sourceFileId,
+                CancellationToken cancellationToken = default)
+        {
+            cancellationToken.ThrowIfCancellationRequested();
+            Increment(SetupReads, sourceFileId);
+            return PreparedCollisionReadResult<FlatSetupCollision>.Loaded(
+                new FlatSetupCollision(
+                    ImmutableArray<FlatCollisionCylinder>.Empty,
+                    ImmutableArray<FlatCollisionSphere>.Empty,
+                    0f,
+                    0f,
+                    0f,
+                    0f));
+        }
+
+        public PreparedCollisionReadResult<
+            FlatCellStructureCollisionAsset>
+            ReadCellStructureCollision(
+                uint sourceFileId,
+                CancellationToken cancellationToken = default) =>
+            PreparedCollisionReadResult<
+                FlatCellStructureCollisionAsset>.Missing;
+
+        public PreparedCollisionReadResult<FlatEnvCellTopology>
+            ReadEnvCellTopology(
+                uint sourceFileId,
+                CancellationToken cancellationToken = default) =>
+            PreparedCollisionReadResult<FlatEnvCellTopology>.Missing;
+
+        public void Dispose() => IsDisposed = true;
+
+        private static FlatPhysicsBsp EmptyPhysicsBsp() => new(
+            -1,
+            ImmutableArray<FlatPhysicsBspNode>.Empty,
+            ImmutableArray<int>.Empty,
+            FlatPolygonTable.Empty);
+
+        private static void Increment(
+            Dictionary<uint, int> counts,
+            uint id) =>
+            counts[id] = counts.TryGetValue(id, out int count)
+                ? count + 1
+                : 1;
+    }
+}

tests/AcDream.Content.Tests/Spells/RetailSpellMetadataProjectorTests.cs

@@ -1,4 +1,4 @@
-using AcDream.App.Spells;
+using AcDream.Content;
 using AcDream.Core.Spells;
 using DatReaderWriter;
 using DatReaderWriter.DBObjs;
@@ -9,7 +9,7 @@ using DatMagicSchool = DatReaderWriter.Enums.MagicSchool;
 using DatSpellCategory = DatReaderWriter.Enums.SpellCategory;
 using CoreSpellTable = AcDream.Core.Spells.SpellTable;
 
-namespace AcDream.App.Tests.Spells;
+namespace AcDream.Content.Tests.Spells;
 
 public sealed class RetailSpellMetadataProjectorTests
 {
@@ -79,7 +79,8 @@ public sealed class RetailSpellMetadataProjectorTests
         string? csvPath = ResolveRepoFile("docs", "research", "data", "spells.csv");
         if (datDir is null || csvPath is null) return;
 
-        using var dats = new DatCollection(datDir, DatAccessType.Read);
+        using var rawDats = new DatCollection(datDir, DatAccessType.Read);
+        using var dats = new DatCollectionAdapter(rawDats);
         MagicCatalog catalog = MagicCatalog.Load(dats);
         CoreSpellTable legacy = CoreSpellTable.LoadFromCsv(csvPath);
 
@@ -106,7 +107,8 @@ public sealed class RetailSpellMetadataProjectorTests
         string? csvPath = ResolveRepoFile("docs", "research", "data", "spells.csv");
         if (datDir is null || csvPath is null) return;
 
-        using var dats = new DatCollection(datDir, DatAccessType.Read);
+        using var rawDats = new DatCollection(datDir, DatAccessType.Read);
+        using var dats = new DatCollectionAdapter(rawDats);
         MagicCatalog catalog = MagicCatalog.Load(dats);
         CoreSpellTable legacy = CoreSpellTable.LoadFromCsv(csvPath);
         var mismatches = new List<string>();

tests/AcDream.Core.Tests/Spells/SpellComponentRequirementServiceTests.cs

@@ -1,8 +1,7 @@
-using AcDream.App.Spells;
 using AcDream.Core.Items;
 using AcDream.Core.Spells;
 
-namespace AcDream.App.Tests.Spells;
+namespace AcDream.Core.Tests.Spells;
 
 public sealed class SpellComponentRequirementServiceTests
 {

tests/AcDream.Headless.Tests/HeadlessProcessContentOwnerTests.cs

@@ -111,6 +111,9 @@ public sealed class HeadlessProcessContentOwnerTests
         Assert.Equal(1, factory.OpenCount);
         Assert.Equal(sessionCount, host.Sessions.Count);
         Assert.Equal(sessionCount, host.Content?.LeaseCount);
+        IPreparedCollisionSource sharedCollision =
+            Assert.IsAssignableFrom<IPreparedCollisionSource>(
+                host.Sessions[0].Content?.PreparedCollision);
         Assert.All(
             host.Sessions,
             session =>
@@ -121,6 +124,12 @@ public sealed class HeadlessProcessContentOwnerTests
                 Assert.Same(
                     factory.PreparedResource,
                     session.Content?.PreparedAssets);
+                Assert.Same(
+                    MagicCatalog.Empty,
+                    session.Content?.MagicCatalog);
+                Assert.Same(
+                    sharedCollision,
+                    session.Content?.PreparedCollision);
             });
         Assert.Equal(
             sessionCount,
@@ -206,12 +215,15 @@ public sealed class HeadlessProcessContentOwnerTests
         internal TestResourceProxy Dats { get; }
         internal TestResourceProxy Prepared { get; }
 
-        public (IDatReaderWriter Dats, IPreparedAssetSource Prepared) Open(
+        public HeadlessOpenedProcessContent Open(
             HeadlessContentDescriptor descriptor,
             Action<string> diagnostic)
         {
             OpenCount++;
-            return (DatsResource, PreparedResource);
+            return new HeadlessOpenedProcessContent(
+                DatsResource,
+                PreparedResource,
+                MagicCatalog.Empty);
         }
     }
 }