feat(O-T7): drop WB project references; complete extraction

End of Phase O extraction. Final cleanup:

- Dropped <ProjectReference> entries to WorldBuilder.Shared and
  Chorizite.OpenGLSDLBackend from both AcDream.App.csproj and
  AcDream.Core.csproj.
- Added Chorizite.Core NuGet PackageReference to AcDream.Core.csproj
  (needed by Core.Rendering.Wb.TextureHelpers for TextureFormat enum;
  previously transitive through the WB project ref).
- Added BCnEncoder.Net.ImageSharp (1.1.2) + SixLabors.ImageSharp (3.1.12)
  as direct PackageReferences to AcDream.App.csproj — previously transitive
  via Chorizite.OpenGLSDLBackend project; used directly by ObjectMeshManager.

Item A (BaseObjectRenderManager static fields):
- Inlined CurrentAtlas/CurrentVAO/CurrentIBO into a new RenderStateCache.cs
  static class (AcDream.App.Rendering.Wb namespace) — the 4 consumers
  (ManagedGLIndexBuffer, ManagedGLTexture, ManagedGLTextureArray, ParticleBatcher)
  all reference RenderStateCache.* instead of BaseObjectRenderManager.*.
- Dropped using Chorizite.OpenGLSDLBackend.Lib from all 4 consumers and from
  WbDrawDispatcher (which had it only as a dead import).

Item B (ActiveParticleEmitter.ObjectLandblock):
- ObjectLandblock? erased to object?; WorldBuilder.Shared.Models.ObjectId? erased
  to ulong? — both fields are stored but never read by any consumer in our codebase.
- Dropped both WB using directives from ActiveParticleEmitter.cs.

Item C (IDatReaderWriter / IDatDatabase):
- Verbatim copy of both interfaces into IDatReaderWriter.cs in
  AcDream.App.Rendering.Wb namespace — DatCollectionAdapter and ObjectMeshManager
  already live in that namespace, so no using changes needed.
- Dropped using WorldBuilder.Shared.Services from DatCollectionAdapter.cs and
  ObjectMeshManager.cs.

Additional extractions required by the reference drop:
- GeometryUtils.cs: verbatim copy of WorldBuilder.Shared.Lib.GeometryUtils
  (float-precision overloads only; Vector3d double-precision overloads omitted —
  ObjectMeshManager uses only the float versions).
- Dropped using WorldBuilder.Shared.Lib from ObjectMeshManager.cs.

WbMeshAdapter.cs cleanup (spec O-D12):
- Deleted _wbDats (DefaultDatReaderWriter) field + ctor init + Dispose call.
- Deleted the [indoor-upload] NULL_RESULT diagnostic block (lines ~205-262) —
  its Phase 2 cell-resolution investigation is complete; its _wbDats.ResolveId
  dependency goes with this commit.
- Deleted _pendingEnvCellRequests field + isPendingEnvCell tracking in Tick().
- Simplified Tick() to a clean drain loop.

Deleted SplitFormulaDivergenceTest.cs — one-time N.5b data-collection sweep;
job done.

Verified acceptance criteria:
- Zero <ProjectReference> to WorldBuilder.* / Chorizite.OpenGLSDLBackend.* in any csproj.
- Zero 'using WorldBuilder.*' / 'using Chorizite.OpenGLSDLBackend.*' in src/.
- DefaultDatReaderWriter referenced in zero places in src/ (comments only).

Build green (0 warnings, 0 errors).
Tests: 1154 total (-1 from deleted SplitFormulaDivergenceTest), 1146 pass,
8 pre-existing failures (unchanged from baseline — physics/input tests
unrelated to this change).

Spec: docs/superpowers/specs/2026-05-21-phase-o-dat-path-unification-design.md

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/AcDream.App/Rendering/Wb/IDatReaderWriter.cs

@@ -0,0 +1,114 @@
+using DatReaderWriter;
+using DatReaderWriter.Enums;
+using DatReaderWriter.Lib.IO;
+using System.Collections.ObjectModel;
+using System.Diagnostics.CodeAnalysis;
+
+// Phase O-T7: verbatim copy of WorldBuilder.Shared.Services.IDatReaderWriter +
+// IDatDatabase into the AcDream.App.Rendering.Wb namespace so the
+// WorldBuilder.Shared project reference can be dropped.
+// The only consumer of IDatReaderWriter in acdream is DatCollectionAdapter +
+// ObjectMeshManager, both already in this namespace.
+
+namespace AcDream.App.Rendering.Wb;
+
+/// <summary>
+/// Interface for the dat reader/writer
+/// </summary>
+public interface IDatReaderWriter : IDisposable {
+    /// <summary>
+    /// Gets the source directory of the DAT files.
+    /// </summary>
+    string SourceDirectory { get; }
+
+    /// <summary>
+    /// Tries to get the raw bytes of a file from a specific region database.
+    /// </summary>
+    bool TryGetFileBytes(uint regionId, uint fileId, ref byte[] bytes, out int bytesRead);
+
+    /// <summary>
+    /// The portal database
+    /// </summary>
+    IDatDatabase Portal { get; }
+
+    /// <summary>
+    /// The cell region databases. Each key is a cell region ID
+    /// </summary>
+    ReadOnlyDictionary<uint, IDatDatabase> CellRegions { get; }
+
+    /// <summary>
+    /// The high res database
+    /// </summary>
+    IDatDatabase HighRes { get; }
+
+    /// <summary>
+    /// The language database
+    /// </summary>
+    IDatDatabase Language { get; }
+
+    /// <summary>
+    /// A mapping of region ids to region dat file entry ids. key: region id, value: region dat file entry
+    /// </summary>
+    ReadOnlyDictionary<uint, uint> RegionFileMap { get; }
+
+    /// <summary>
+    /// Gets the current portal iteration.
+    /// </summary>
+    int PortalIteration { get; }
+
+    /// <summary>
+    /// Gets the current cell iteration (from the first cell region).
+    /// </summary>
+    int CellIteration { get; }
+
+    /// <summary>
+    /// Gets the current high res iteration.
+    /// </summary>
+    int HighResIteration { get; }
+
+    /// <summary>
+    /// Gets the current language iteration.
+    /// </summary>
+    int LanguageIteration { get; }
+
+    /// <summary>Attempts to save a database object to the appropriate DAT.</summary>
+    bool TrySave<T>(T obj, int iteration = 0) where T : IDBObj;
+
+    /// <summary>Attempts to save a database object to the appropriate DAT for a specific region.</summary>
+    bool TrySave<T>(uint regionId, T obj, int iteration = 0) where T : IDBObj;
+
+    /// <summary>
+    /// Resolution of a data ID to a database and type
+    /// </summary>
+    public record IdResolution(IDatDatabase Database, DBObjType Type);
+
+    /// <summary>
+    /// Resolves a data ID to all possible databases and types.
+    /// </summary>
+    public IEnumerable<IdResolution> ResolveId(uint id);
+}
+
+/// <summary>
+/// Interface for a dat database, providing methods to retrieve files and objects.
+/// </summary>
+public interface IDatDatabase : IDisposable {
+    DatDatabase Db { get; }
+
+    /// <summary>Retrieves the current iteration of the database.</summary>
+    int Iteration { get; }
+
+    /// <summary>Retrieves all file IDs of a specific type.</summary>
+    public IEnumerable<uint> GetAllIdsOfType<T>() where T : IDBObj;
+
+    /// <summary>Attempts to retrieve a database object by its file ID.</summary>
+    public bool TryGet<T>(uint fileId, [MaybeNullWhen(false)] out T value) where T : IDBObj;
+
+    /// <summary>Attempts to retrieve the raw bytes of a file by its ID.</summary>
+    bool TryGetFileBytes(uint fileId, [MaybeNullWhen(false)] out byte[] value);
+
+    /// <summary>Attempts to retrieve the raw bytes of a file by its ID into a provided buffer.</summary>
+    bool TryGetFileBytes(uint fileId, ref byte[] bytes, out int bytesRead);
+
+    /// <summary>Attempts to save a database object.</summary>
+    bool TrySave<T>(T obj, int iteration = 0) where T : IDBObj;
+}