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)

docs/architecture/acdream-architecture.md

@@ -708,6 +708,16 @@ replace state produced by another job. CPU mesh extraction may still be schedule
 onto `ObjectMeshManager`'s thread-safe work queue, but the worker never publishes
 partially hydrated cell membership or shell placement to the renderer.
 
+`RuntimeOptions.StreamingWorkBudgets` is the single startup profile for
+update-thread streaming cost. `StreamingWorkMeter` owns the frame-scoped
+admission ledger; `LandblockStreamResultCost` assigns deterministic charges to
+immutable completion arrays and logical retained entries without claiming to
+measure CLR allocator overhead. During Slice E1 the ledger is observational:
+the existing scheduler still executes its accepted work, while lifecycle
+artifacts record would-yield limits, elapsed work, retained backlog bytes/age,
+and pending publication/retirement counts. Enforcement belongs to the explicit
+Slice E scheduler, not to presentation owners or the worker.
+
 ### World-reveal readiness ownership
 
 `WorldRevealCoordinator` is the single App-layer owner of each login or portal

docs/plans/2026-07-24-modern-runtime-architecture.md

@@ -2,7 +2,7 @@
 
 **Date:** 2026-07-24
 
-**Status:** Slices A–D complete. Slice E is active.
+**Status:** Slices A–D complete. Slice E is active (E0/E1 complete).
 
 **Scope:** Reconcile and sequence the existing Modern Pipeline (`MP`) and
 Linux/headless (`LH`) tracks using the 2026-07-24 connected performance audit.
@@ -726,6 +726,12 @@ checkpoint retained staged or retiring bytes. Evidence:
 
 **Active plan:** [`2026-07-24-modern-runtime-slice-e-cost-budgeted-streaming.md`](2026-07-24-modern-runtime-slice-e-cost-budgeted-streaming.md).
 
+**Checkpoint 2026-07-24:** E0 fixed the retail/adaptation contract and current
+owner inventory. E1 landed the validated work profile, deterministic meter and
+completion charge model, plus lifecycle-artifact shadow diagnostics while
+preserving the prior scheduler's execution. E2 is the first enforcement
+cutover.
+
 **Purpose:** Remove update-thread portal transactions.
 
 - Introduce explicit stage queues and `StreamingWorkBudget`.

docs/plans/2026-07-24-modern-runtime-slice-e-cost-budgeted-streaming.md

@@ -1,6 +1,6 @@
 # Modern Runtime Slice E — Cost-budgeted streaming and retirement
 
-**Status:** active — E0 contract/inventory complete
+**Status:** active — E0/E1 complete; E2 explicit admission queues next
 **Program:** `docs/plans/2026-07-24-modern-runtime-architecture.md`
 **Baseline:** Slice D closeout commit `66690805`
 **Behavior contract:** no visual-quality or retail-behavior reduction
@@ -232,6 +232,20 @@ the active destination generation. Far-ring work may continue after reveal.
   lifecycle artifacts.
 - Preserve current execution while measuring the would-yield decisions.
 
+**Complete 2026-07-24.** `RuntimeOptions` now owns one validated scheduling
+profile (time, admissions, retained CPU bytes, entity operations, requested GPU
+bytes, GL retire operations, and destination reserve). The single-thread meter
+has a deterministic clock seam, first-operation progress rule, explicit
+yield/oversize/failure/overrun facts, and no effect on legacy execution at this
+checkpoint. Immutable completion payloads receive deterministic charges for
+their exact array data and logical retained entries; this is deliberately not
+misreported as CLR heap size. Lifecycle JSON now includes last-frame work,
+deferred retained bytes/age, and pending publication/retirement counts.
+
+Validation: complete App suite 3,643 passed / 3 skipped; complete solution
+8,124 passed / 5 skipped; Release solution build green. Existing priority,
+retry, stale-generation, and deferred-compaction tests remain green.
+
 ### E2 — Explicit admission queues
 
 - Replace `_deferredApply` with stable generation/priority queues.