docs(runtime): close exact world host ownership

docs/plans/2026-07-26-modern-runtime-slice-j6.md

@@ -1,6 +1,6 @@
 # Modern runtime Slice J6 — world, transit, and host handshake
 
-**Status:** J6.0–J6.3 COMPLETE; J6.4 ACTIVE
+**Status:** J6 COMPLETE
 **Parent:** `2026-07-25-modern-runtime-slice-j.md`, J6  
 **Authorization:** the user approved Slices F–L, including gameplay-owner
 moves, on 2026-07-24  
@@ -53,11 +53,11 @@ the teleport generation, destination identity, materialization state, or
 simulation availability. A headless host supplies the same acknowledgement
 contract using its own required domains.
 
-## 2. Current owner inventory
+## 2. Baseline owner inventory (before J6)
 
-### 2.1 Authoritative state incorrectly retained in App
+### 2.1 Authoritative state that J6 removed from App
 
-| Current owner | State | J6 destination |
+| Baseline App owner | State | Final J6 owner |
 |---|---|---|
 | `WorldEnvironmentController` | server-synced world clock, selected day group, weather, AdminEnvirons override, debug overrides | `RuntimeWorldEnvironmentState` |
 | static `DerethDateTime.OriginOffsetTicks` | mutable Region calendar origin shared by every process session | instance `DerethCalendar` owned by each environment |
@@ -292,6 +292,8 @@ warning. Evidence:
 
 ### J6.4 — projection acknowledgement and owner cleanup
 
+**Complete 2026-07-26 at `18d17d8b`.**
+
 - Make App presentation registration/withdrawal use typed generation-scoped
   acknowledgements.
 - Ensure simulation release, viewport reveal, reservation release, and final
@@ -306,8 +308,19 @@ warning. Evidence:
 Gate: source/dependency guards find no App authority or Runtime presentation
 dependency; every failure-injection ledger converges to zero.
 
+Result: Runtime owns an exact host-projection token and typed remaining-stage
+ledger for each reveal generation/destination. App retains only graphical
+resource receipts attached to that token. Registration, simulation release,
+reservation release, terminal completion, cancellation, supersession, and
+reset preserve an exact retryable suffix through callback failure and
+re-entrancy. Normalized checkpoints expose environment and transit ownership,
+including pending host acknowledgements. Direct Runtime fixtures complete
+login, portal, cancellation, and reset without loading App or a backend.
+
 ### J6.5 — connected and documentation closeout
 
+**Complete 2026-07-26.**
+
 - Run focused Core, Runtime, and App projects.
 - Run `dotnet build AcDream.slnx -c Release`.
 - Run the complete Release test suite.
@@ -318,6 +331,14 @@ dependency; every failure-injection ledger converges to zero.
 - Update architecture, code structure, milestone, roadmap, parent plan,
   AGENTS/CLAUDE, divergence ledger, and durable memory.
 
+Runtime tests pass 365/365, App tests pass 3,716/3 skips, and the complete
+Release suite passes 8,642/5 skips. Exact-binary report
+`logs/connected-world-gate-20260726-182805/report.json` records six capped
+checkpoints and one uncapped fresh-process reconnect, graceful code-zero exits,
+zero failures, and zero environment/transit/host ownership debt at every
+stable checkpoint. Evidence:
+[`../research/2026-07-26-slice-j6-4-host-acknowledgement.md`](../research/2026-07-26-slice-j6-4-host-acknowledgement.md).
+
 J6 is complete only when automated and connected evidence proves:
 
 - one Runtime environment owner;
@@ -375,6 +396,12 @@ J6.3 exact rollback:
 git revert 6a063a27d4c805cd166d5a487afc290c34c400fd
 ```
 
+J6.4 exact rollback:
+
+```text
+git revert 18d17d8bb17ed9ff3ed01da8273e2948abe6398b
+```
+
 Documentation-only research/plan commits are not behavior rollback points.
 No workaround, timer, forced-ready path, duplicated owner, or alternate
 headless behavior is permitted.