perf(content): close prepared asset cutover

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

@@ -2,8 +2,7 @@
 
 **Date:** 2026-07-24
 
-**Status:** Slice A complete on the physical reference display; Slice B
-complete. Slice C is unblocked and active.
+**Status:** Slices A–C complete. Slice D is next and not yet started.
 
 **Scope:** Reconcile and sequence the existing Modern Pipeline (`MP`) and
 Linux/headless (`LH`) tracks using the 2026-07-24 connected performance audit.
@@ -631,6 +630,15 @@ collision in WorldBuilder's legacy 31× geometry hash. Evidence:
 single-frame allocation and p99 materially improve from the 2026-07-24 baseline;
 connected nine-stop route and screenshots pass.
 
+**Completed 2026-07-24:** production streaming now consumes the validated
+format-1/bake-tool-3 package through `IPreparedAssetSource`, with no implicit
+live-DAT mesh fallback. Capped, uncapped, and dense-Arwic physical routes,
+installed-DAT equivalence, lifecycle assertions, graceful teardown, the full
+Release suite, and the user's visual gate passed. Process allocation fell
+41.8–61.9%, GC pause time fell 48.4–54.1%, uncapped CPU/GPU p99 improved
+17.0%/20.6%, and invalid typed-Setup exceptions fell to zero. Evidence:
+[`../research/2026-07-24-slice-c-prepared-asset-cutover-report.md`](../research/2026-07-24-slice-c-prepared-asset-cutover-report.md).
+
 **Amendment (2026-07-24 review).** Binding contracts for this slice:
 
 - **Precedence contract.** The LINQ being replaced is load-bearing content
@@ -1129,13 +1137,14 @@ an improvement" carries the same evidence burden as a regression claim.
 
 ## 14. Current execution point
 
-Slice A's tooling and authoritative physical-local evidence are complete, and
-Slice B's prepared-content bake is complete. Slice C is active. Its comparison
-baseline is the committed physical-local capture at
-`49f3a48ee63b82d00731b0f91497930925279c86`: uncapped CPU p50/p95/p99
-1.520/5.694/7.825 ms, GPU p50/p95/p99 0.897/3.239/3.406 ms, portal allocation
-max 212.7 MiB, process allocation mean 50.0 MB/s, and a repeated-Caul working
-set plateau failure of 295.1 MiB.
+Slices A–C are complete. Slice C replaced production live-DAT world-mesh
+extraction with the validated prepared source and passed all connected,
+performance, lifetime, automated, and user-visual gates. Its physical
+uncapped result is CPU p50/p95/p99 1.409/4.909/6.496 ms, GPU
+0.832/2.510/2.706 ms, a 39.9 MiB largest frame allocation, zero invalid Setup
+probe exceptions, and a passing warm repeated-Caul memory assertion. Slice D
+is the next execution point; it unifies accounting and policy around the
+specialized caches that remain, rather than replacing their working storage.
 
 The intended order is therefore: