feat(streaming): establish cost budget ledger

Add the validated frame-work profile, deterministic completion charges, and shadow admission meter before enforcing the scheduler in Slice E2. Lifecycle artifacts now expose elapsed work, would-yield limits, backlog bytes/age, and pending owner ledgers without changing accepted execution.

Tests: dotnet build AcDream.slnx -c Release --no-restore; dotnet test AcDream.slnx -c Release --no-build --no-restore (8124 passed, 5 skipped)

src/AcDream.App/Diagnostics/WorldLifecycleAutomationController.cs

@@ -77,6 +77,7 @@ internal sealed record WorldLifecycleResourceSnapshot(
     long DatObjectCacheHits,
     long DatObjectCacheMisses,
     long DatObjectCacheEvictions,
+    StreamingWorkDiagnostics StreamingWork,
     ResidencySnapshot Residency,
     double Fps,
     double FrameMilliseconds,

src/AcDream.App/Diagnostics/WorldLifecycleResourceSnapshotSource.cs

@@ -163,6 +163,7 @@ internal sealed class WorldLifecycleResourceSnapshotSource
             DatObjectCacheHits: datObjectCacheStats.Hits,
             DatObjectCacheMisses: datObjectCacheStats.Misses,
             DatObjectCacheEvictions: datObjectCacheStats.Evictions,
+            StreamingWork: _streaming.WorkDiagnostics,
             Residency: residency,
             Fps: render.Fps,
             FrameMilliseconds: render.FrameMilliseconds,