feat(render) Campaign FW2: OrderedDrawStream + walk-order submitter

The walk-order submission layer over the existing RHI (plan section FW2):

- OrderedDrawStream: append-only walk-ordered draw commands
  (GroupKey + transform + per-instance data + WalkDrawStage + cell
  provenance), struct-of-arrays with one lockstep Reset (#193 shape).
  The PortalPunch stage exists but has no FW2 submission path - the
  submitter throws on it; punch emission lands with FW3 wiring.
- WbDrawDispatcher.OrderedStream partial: per-instance-first emission
  (the deferred-alpha shape - command i owns instance i, walk order
  survives into the indirect array), each SSBO section written once,
  then one DrawIndirectRangeRhi call per maximal merge run. Runs are
  built by pure-CPU BuildOrderedMergeRuns and may never span a stage,
  pipeline-bucket, or cull boundary; ValidateMergeRun re-checks every
  emitted run and throws (the campaign fail-loud rule). Nothing is
  sorted, reordered, or dropped: N commands in, N indirect commands
  out, covered exactly once.
- WorldDepthContract: retail world depth verified verbatim from the
  decomp - Render::zfuncVal @0x00820e1c = 0x2, SetDepthBufferMode
  @0x005a2d10 writes the enum directly as D3DRS_ZFUNC so the value IS
  D3DCMP_LESS, applied by the surface-state applier @0x0059c80a with
  Z-write toggled by blend; the LESSEQUAL sites are GameSky::Draw-local.
  Seven world pipeline sites now cite the named constant (no value
  changes).
- Plan updated: FW1 status block + gate amendment (the ten pose-stamped
  retail traces supersede re-expressing the old-builder replay
  fixtures; those retire with the old builder at FW4 and their
  scenario classes re-verify at the FW3/FW4 connected gates).

Known FW2 scope notes recorded in the code: the building-detail
overlay replay is production wiring (FW3); the _drawCullModes scratch
may not interleave with a mid-flight RetailAlphaQueue scope (FW3
sequencing constraint). The pixel A/B equivalence proof rides FW3's
cutover toggle where a walk-driven scene first exists.

Suites: full Release build 0 warnings; Walk lane 154/1 skip;
hermetic 6,714/0 (+27 new).

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

src/AcDream.App/Rendering/DirectionalSunShadowRenderer.cs

@@ -1073,6 +1073,12 @@ internal sealed class DirectionalSunShadowRenderer : IDirectionalShadowReceiverS
         });
     }
 
+    /// <summary>
+    /// The caster's own depth-only pipeline. Depth compare is
+    /// <see cref="WorldDepthContract.WorldCompare"/> — see that type for the
+    /// world-space <c>GL_LESS</c> citation this shares with every other world
+    /// pipeline.
+    /// </summary>
     private static IGpuPipeline CreatePipeline(
         IGpuDevice device,
         string name,
@@ -1087,7 +1093,7 @@ internal sealed class DirectionalSunShadowRenderer : IDirectionalShadowReceiverS
             VertexLayout = layout,
             Topology = GpuPrimitiveTopology.TriangleList,
             Blend = GpuBlendMode.None,
-            Depth = new GpuDepthState(true, true, GpuCompareOp.Less),
+            Depth = new GpuDepthState(true, true, WorldDepthContract.WorldCompare),
             Cull = GpuCullMode.Back,
             FrontFace = frontFace,
             AlphaToCoverage = false,