fix(A.5 T2): document Kind placeholder in HandleJob

Code review on commit 90a2027 flagged that HandleJob silently ignores
load.Kind. Add a TODO(A.5 T11/T16) comment at the case arm so the
unused field reads as a planned stub, not a bug.

No semantic change.

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

src/AcDream.App/Streaming/LandblockStreamer.cs

@@ -157,6 +157,11 @@ public sealed class LandblockStreamer : IDisposable
         switch (job)
         {
             case LandblockStreamJob.Load load:
+                // TODO(A.5 T11/T16): route by load.Kind. LoadFar will skip
+                // LandBlockInfo + scenery generation; PromoteToNear will skip
+                // mesh build (terrain already on GPU). Today every Kind takes
+                // the full-load path via _loadLandblock, which matches today's
+                // single-tier semantics.
                 try
                 {
                     var lb = _loadLandblock(load.LandblockId);