docs(runtime): close Slice J and activate Slice K

Record the shared graphical/no-window reset architecture, deterministic lifecycle evidence, exact rollback point, and synchronized project guidance before beginning the Linux headless host.

Co-authored-by: Codex <noreply@openai.com>

AGENTS.md

@@ -345,7 +345,12 @@ single `GameRuntime` root at `96ddd165`; J7.2/J7.3 cut graphical production
 and shutdown over at `ce41efb9`. Its 383 Runtime tests, 3,717 App tests /
 3 skips, 8,661 complete Release tests / 5 skips, lifecycle/reconnect route,
 canonical nine-stop route, and the user's 2026-07-27 exact post-cutover visual
-matrix pass. J7 is closed; J8 no-window integration is active.
+matrix pass. J7 is closed. J8 closed Slice J at `a9a822f2`: graphical and
+no-window hosts share one `GameRuntime`, one retryable canonical-generation
+reset transaction, and one gameplay-owner graph. Its 395 Runtime tests, 3,731
+App tests / 3 skips, 8,696 complete Release tests / 5 skips, exact-binary
+lifecycle/reconnect route, and canonical nine-stop route pass. Slice K
+Linux headless/multi-session implementation is active.
 J0's rollback is
 `git revert b632672e5ccabfb44c551e08f1c411ab2669c44a`.
 J1's rollback is
@@ -400,6 +405,8 @@ J7.1's rollback is
 `git revert 96ddd16539e670a5ce9b1f86677530e3fbc3f635`.
 J7.2/J7.3's rollback is
 `git revert ce41efb9e5938f79a7580476b949d172f52a1e69`.
+J8's rollback is
+`git revert a9a822f206cc6021bc099988144488f3bd7c397b`.
 Slice H's retained UI/frame, bounded-light, and pooled/borrowed/direct network
 work is complete; the exact seven-checkpoint connected lifecycle/reconnect gate
 passes. Slice I is closed in
@@ -426,8 +433,10 @@ closeout is
 closeout is
 `docs/research/2026-07-26-slice-j6-3-teleport-correlation.md`; J6 closeout is
 `docs/research/2026-07-26-slice-j6-4-host-acknowledgement.md`. J7 closeout is
-`docs/research/2026-07-26-slice-j7-game-runtime-root-cutover.md`; J8 executes
+`docs/research/2026-07-26-slice-j7-game-runtime-root-cutover.md`; J8/Slice-J
-from `docs/plans/2026-07-26-modern-runtime-slice-j8.md`. The exact G4 visual
+closeout is
+`docs/research/2026-07-27-slice-j8-no-window-closeout.md`; Slice K executes
+from `docs/plans/2026-07-26-modern-runtime-slice-k.md`. The exact G4 visual
 rollback
 is `git revert ef1d263337997bb030eadb7b8e71d73dc659907a`; do not revert G3 or
 the portal-warmup corrections. Evidence:
@@ -467,7 +476,7 @@ uncapped Release presentation is smooth, while physics, collision, and wire
 truth remain correct.
 See `docs/plans/2026-07-22-gamewindow-slice-8-composition-lifecycle.md` and
 `docs/architecture/code-structure.md`. **Carried:** #153, #116, remaining
-R6 ownership cleanup, TS-50/TS-51/TS-53, Modern Runtime Slice J8+, and #225's
+R6 ownership cleanup, TS-50/TS-51/TS-53, Modern Runtime Slice K+, and #225's
 lifestone/particle alpha visual gate.
 
 Start structural work at `memory/project_gamewindow_decomposition.md` and

CLAUDE.md

@@ -343,7 +343,12 @@ single `GameRuntime` root at `96ddd165`; J7.2/J7.3 cut graphical production
 and shutdown over at `ce41efb9`. Its 383 Runtime tests, 3,717 App tests /
 3 skips, 8,661 complete Release tests / 5 skips, lifecycle/reconnect route,
 canonical nine-stop route, and the user's 2026-07-27 exact post-cutover visual
-matrix pass. J7 is closed; J8 no-window integration is active.
+matrix pass. J7 is closed. J8 closed Slice J at `a9a822f2`: graphical and
+no-window hosts share one `GameRuntime`, one retryable canonical-generation
+reset transaction, and one gameplay-owner graph. Its 395 Runtime tests, 3,731
+App tests / 3 skips, 8,696 complete Release tests / 5 skips, exact-binary
+lifecycle/reconnect route, and canonical nine-stop route pass. Slice K
+Linux headless/multi-session implementation is active.
 J0's rollback is
 `git revert b632672e5ccabfb44c551e08f1c411ab2669c44a`.
 J1's rollback is
@@ -398,6 +403,8 @@ J7.1's rollback is
 `git revert 96ddd16539e670a5ce9b1f86677530e3fbc3f635`.
 J7.2/J7.3's rollback is
 `git revert ce41efb9e5938f79a7580476b949d172f52a1e69`.
+J8's rollback is
+`git revert a9a822f206cc6021bc099988144488f3bd7c397b`.
 Slice H's retained UI/frame, bounded-light, and pooled/borrowed/direct network
 work is complete; the exact seven-checkpoint connected lifecycle/reconnect gate
 passes. Slice I is closed in
@@ -424,8 +431,10 @@ closeout is
 closeout is
 `docs/research/2026-07-26-slice-j6-3-teleport-correlation.md`; J6 closeout is
 `docs/research/2026-07-26-slice-j6-4-host-acknowledgement.md`. J7 closeout is
-`docs/research/2026-07-26-slice-j7-game-runtime-root-cutover.md`; J8 executes
+`docs/research/2026-07-26-slice-j7-game-runtime-root-cutover.md`; J8/Slice-J
-from `docs/plans/2026-07-26-modern-runtime-slice-j8.md`. The exact G4 visual
+closeout is
+`docs/research/2026-07-27-slice-j8-no-window-closeout.md`; Slice K executes
+from `docs/plans/2026-07-26-modern-runtime-slice-k.md`. The exact G4 visual
 rollback
 is `git revert ef1d263337997bb030eadb7b8e71d73dc659907a`; do not revert G3 or
 the portal-warmup corrections. Evidence:
@@ -465,7 +474,7 @@ uncapped Release presentation is smooth, while physics, collision, and wire
 truth remain correct.
 See `docs/plans/2026-07-22-gamewindow-slice-8-composition-lifecycle.md` and
 `docs/architecture/code-structure.md`. **Carried:** #153, #116, remaining
-R6 ownership cleanup, TS-50/TS-51/TS-53, Modern Runtime Slice J8+, and #225's
+R6 ownership cleanup, TS-50/TS-51/TS-53, Modern Runtime Slice K+, and #225's
 lifestone/particle alpha visual gate.
 
 Start structural work at `memory/project_gamewindow_decomposition.md` and

docs/README.md

@@ -35,14 +35,15 @@ banner cannot silently override the current program state.
   in `#225`; its connected resource-lifetime and performance routes pass.
 - **Carried behavior debt:** `#153` (far teleport onto an unstreamed edge),
   `#116` (two narrowed slide-response cases), and divergence rows TS-50/TS-51.
-- **Active engineering track:** complete Slice J's world handshake,
+- **Active engineering track:** Slice J's presentation-independent runtime,
-  composition root, and no-window closeout, then build the approved
+  composition root, shared generation reset, and no-window closeout are
-  Linux/headless multi-session host in Slice K. J5.7's exact rollback is
+  complete. Build the approved Linux/headless multi-session host in Slice K.
-  `git revert cdee7a4b49addb5e1500753f6a885f7c899bd0f0`.
+  J8's exact rollback is
+  `git revert a9a822f206cc6021bc099988144488f3bd7c397b`.
 - **Divergence audit:** 178 active rows — IA 17, AD 37, AP 85, TS 34,
   and UN 5 — plus the retained retired TS-37 history note.
-- **Latest automated baseline:** Release build succeeds; 8,596 tests pass and
+- **Latest automated baseline:** Release build succeeds; 8,696 tests pass and
-  five are intentionally skipped. The exact J5.7 lifecycle/reconnect and
+  five are intentionally skipped. The exact J8 lifecycle/reconnect and
   canonical nine-stop gates match embedded binary/source commit, converge
   every backlog, and complete with graceful zero-code exits and zero failures.
 

docs/architecture/acdream-architecture.md

@@ -241,7 +241,8 @@ src/
     World/
       RuntimeWorldEnvironmentState.cs -> canonical calendar/time/weather owner
       RuntimeWorldTransitState.cs -> canonical reveal generation/readiness owner
-    -> J3–J6 complete; J7 composition-root convergence active
+    RuntimeGenerationReset.cs -> one retryable canonical-generation reset
+    -> Slice J complete; graphical and no-window hosts share one GameRuntime
     -> may reference Core, Core.Net, Content, and Plugin.Abstractions only
     -> must never reference App, UI, Silk.NET, OpenAL, Arch, or ImGui
   

docs/architecture/code-structure.md

@@ -479,7 +479,7 @@ useful ordering seam, but its ownership status is **partial**.
 | Projectile simulation | **J5.6 complete** | `RuntimeEntityRecord`/`RuntimePhysicsState` own the canonical projectile component, exact-key workset, prediction/correction state, unchanged retail quantum/integration/sweep/collision loop, and cell commits. App resolves immutable Setup/DAT shape input and projects committed render, shadow, and effect-pose results only (`2aee3356`). |
 | Landblock presentation | **Complete** | `LandblockBuildFactory` owns the captured-origin DAT transaction; concrete render/physics/DAT-static publishers and `LandblockPresentationPipeline` own typed-meter publication and exact retryable retirement. `StreamingController` owns stable destination/control/unload/Near/Far queues and destination reservation. CPU mesh-cache restaging requires an exact live owner. `StreamingOriginRecenterCoordinator` serializes old-window retirement with teleport/session origin lifetimes. `GameWindow` retains construction and one pipeline field only (`c79d0a49`, closeout `4a205a3e`; Slice E closeout `91e82c3c`). |
 | Render-frame orchestration | **Complete** | `RenderFrameOrchestrator` owns the GPU-flight, resource, world/PView/shared-alpha, private-presentation, diagnostics, screenshot, and recovery graph. `GameWindow.OnRender` takes one logical window-size snapshot and performs one immutable handoff (`9d7df1bf`). |
-| Unified `GameEntity` | **Slice J active at J7** | Canonical identity, retained-object lifetime, direct views, ordered entity/object deltas, J4 gameplay state, and the complete J5 action/combat/magic/movement/physics/remote/projectile simulation graph share failure-safe Runtime owners while exact graphical sidecars stay in App. J5 closeout proves Runtime-only parity and one terminal ownership ledger. J6 moved world environment, reveal-generation truth, exact F751/Position destination correlation, and typed graphical-host acknowledgement into Runtime. J7 now composes those already-proven owners behind one `GameRuntime` root without adding another state layer. |
+| Unified `GameEntity` | **Slice J complete** | Canonical identity, retained-object lifetime, direct views, ordered entity/object deltas, gameplay state, action/combat/magic/movement/physics/remote/projectile simulation, world environment, reveal/transit truth, and host acknowledgement share failure-safe Runtime owners while exact graphical sidecars stay in App. One `GameRuntime` composes the graph. `RuntimeGenerationReset` is the sole retryable canonical-generation reset for graphical and no-window hosts; the deterministic direct host proves lifecycle, commands, portal, reconnect, GUID reuse, fault recovery, isolation, and terminal convergence without presentation assemblies (`a9a822f2`). |
 
 ### 4.3 Revised extraction sequence
 

docs/plans/2026-04-11-roadmap.md

@@ -1,6 +1,6 @@
 # acdream — strategic roadmap
 
-**Status:** Living document. Updated 2026-07-27. **M3 landed; M4 is active.** M3's retail casting/UI, R6 locomotion/collision/projectile/teleport/radar rebaseline, deterministic fresh-login/portal world lifecycle, and final two-client portal observer flow are user-gated. All eight slices of the behavior-preserving ownership campaign in [`docs/architecture/code-structure.md`](../architecture/code-structure.md), their automated closeout, and the user's connected visual matrix are complete. Modern Runtime J3 canonical entity/object lifetime and J4 gameplay-state ownership are closed at `89e6b207`; J5.1 canonical selection/combat/target-mode ownership is closed at `b298f99f`, J5.2 interaction transactions at `f5f7b417`, J5.3 combat/magic intent at `20df9d15`, J5.4 local movement/outbound cadence at `aa3f4a60`, J5.5 per-session physics/remote simulation at `7e6033d0`, J5.6 projectile simulation at `2aee3356`, and J5.7 combined simulation closeout at `cdee7a4b`. J6.1 world-environment ownership is closed at `902076c0`; J6.2 canonical reveal generation and typed destination readiness is closed at `a6860d55` plus `acb845d8`; J6.3 exact F751/Position destination correlation is closed at `6a063a27`; J6.4 exact graphical-host acknowledgement and owner cleanup is closed at `18d17d8b`. J7's one graphical `GameRuntime` root is closed at `ce41efb9`, including the user's 2026-07-27 exact post-cutover visual acceptance. J8 no-window integration is active. Issue #225's lifestone/particle alpha comparison remains a separate rendering visual gate.
+**Status:** Living document. Updated 2026-07-27. **M3 landed; M4 is active.** M3's retail casting/UI, R6 locomotion/collision/projectile/teleport/radar rebaseline, deterministic fresh-login/portal world lifecycle, and final two-client portal observer flow are user-gated. All eight slices of the behavior-preserving ownership campaign in [`docs/architecture/code-structure.md`](../architecture/code-structure.md), their automated closeout, and the user's connected visual matrix are complete. Modern Runtime J3 canonical entity/object lifetime and J4 gameplay-state ownership are closed at `89e6b207`; J5.1 canonical selection/combat/target-mode ownership is closed at `b298f99f`, J5.2 interaction transactions at `f5f7b417`, J5.3 combat/magic intent at `20df9d15`, J5.4 local movement/outbound cadence at `aa3f4a60`, J5.5 per-session physics/remote simulation at `7e6033d0`, J5.6 projectile simulation at `2aee3356`, and J5.7 combined simulation closeout at `cdee7a4b`. J6.1 world-environment ownership is closed at `902076c0`; J6.2 canonical reveal generation and typed destination readiness is closed at `a6860d55` plus `acb845d8`; J6.3 exact F751/Position destination correlation is closed at `6a063a27`; J6.4 exact graphical-host acknowledgement and owner cleanup is closed at `18d17d8b`. J7's one graphical `GameRuntime` root is closed at `ce41efb9`, including the user's 2026-07-27 exact post-cutover visual acceptance. J8 closed Slice J at `a9a822f2` with one shared graphical/no-window root and generation-reset transaction. Slice K Linux headless/multi-session work is active. Issue #225's lifestone/particle alpha comparison remains a separate rendering visual gate.
 **Purpose:** One source of truth for where the project is and where it's going. Every observed defect or missing feature has a named phase that owns it; when something looks wrong in-game, look here to find the phase that'll address it. Implementation details live in per-phase specs under `docs/superpowers/specs/`, not in this file.
 
 ---
@@ -1797,8 +1797,10 @@ port in any phase — no separate listing here.
 > Runtime tests, 3,716 App tests / 3 skips, 8,642-test / 5-skip complete Release
 > suite, and exact-binary lifecycle/reconnect route pass with zero ownership
 > debt at every checkpoint. J7 completed at `ce41efb9`; the user accepted its
-> exact post-cutover visual matrix on 2026-07-27. J8 no-window integration and
+> exact post-cutover visual matrix on 2026-07-27. J8 closed Slice J at
-> Slice-J closeout are active.
+> `a9a822f2`: 395 Runtime tests, 3,731 App tests / 3 skips, 8,696 complete-
+> solution tests / 5 skips, lifecycle/reconnect, and canonical nine-stop gates
+> pass. Slice K Linux headless/multi-session implementation is active.
 > The historical exact cutover
 > rollback remains
 > `git revert ef1d263337997bb030eadb7b8e71d73dc659907a`. Slice H is complete:

docs/plans/2026-05-12-milestones.md

@@ -273,8 +273,13 @@ residency is `0/0/0` at every stable checkpoint and teardown converges. Slice I
   / 5 skips, and exact-binary lifecycle/reconnect route pass with every
   environment/transit/host ledger at zero. J7 composition-root convergence
   completed at `ce41efb9`; the user accepted its exact post-cutover visual
-  matrix on 2026-07-27. J8 is active under
+  matrix on 2026-07-27. J8 closed Slice J at `a9a822f2`: graphical and
-  [`2026-07-25-modern-runtime-slice-j.md`](2026-07-25-modern-runtime-slice-j.md).
+  no-window hosts share one `GameRuntime`, one canonical generation-reset
+  transaction, and one gameplay-owner graph. Its 395 Runtime tests, 3,731 App
+  tests / 3 skips, 8,696 complete-solution tests / 5 skips, exact-binary
+  lifecycle/reconnect route, and canonical nine-stop route pass. Slice K is
+  active under
+  [`2026-07-26-modern-runtime-slice-k.md`](2026-07-26-modern-runtime-slice-k.md).
 Slice-I closeout evidence is
 [`../research/2026-07-25-slice-i7-closeout.md`](../research/2026-07-25-slice-i7-closeout.md).
 Slice-J2 closeout evidence is

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

@@ -25,8 +25,9 @@ J6 completed at `18d17d8b`: Runtime owns world environment, canonical reveal
 generation/readiness, exact F751/Position destination correlation, and the
 generation/cell-scoped graphical-host acknowledgement suffix. J7 completed
 at `ce41efb9` with its automated gates and the user's 2026-07-27
-physical-display acceptance. J8 no-window integration and Slice-J closeout are
+physical-display acceptance. J8 and Slice J closed at `a9a822f2`: graphical
-active.
+and direct hosts share one `GameRuntime`, one retryable generation-reset
+transaction, and one canonical gameplay-owner graph. Slice K is active.
 
 **Scope:** Reconcile and sequence the existing Modern Pipeline (`MP`) and
 Linux/headless (`LH`) tracks using the 2026-07-24 connected performance audit.
@@ -1065,7 +1066,7 @@ host-parity tests after each move.
 
 **Prepared execution plan:**
 [`2026-07-26-modern-runtime-slice-k.md`](2026-07-26-modern-runtime-slice-k.md).
-Implementation begins after Slice J's no-window closeout.
+Implementation began after Slice J's no-window closeout at `a9a822f2`.
 
 **Purpose:** Deliver efficient automated bots.
 
@@ -1304,8 +1305,10 @@ projection stages and App owns only retryable resource receipts. Its 365
 Runtime tests, 3,716 App tests / 3 skips, 8,642-test / 5-skip complete Release
 suite, and exact-binary lifecycle/reconnect gate pass with zero ownership debt
 at every stable checkpoint. J7 completed at `ce41efb9`, and the user accepted
-its exact post-cutover visual matrix on 2026-07-27. J8 is the current execution
+its exact post-cutover visual matrix on 2026-07-27. J8 closed Slice J at
-point.
+`a9a822f2`; 395 Runtime tests, 3,731 App tests / 3 skips, 8,696 complete-
+solution tests / 5 skips, lifecycle/reconnect, and canonical nine-stop gates
+pass. Slice K is the current execution point.
 Evidence:
 [`../research/2026-07-25-slice-g5-production-profile.md`](../research/2026-07-25-slice-g5-production-profile.md)
 and

docs/plans/2026-07-25-modern-runtime-slice-j.md

@@ -1,6 +1,6 @@
 # Modern runtime Slice J — presentation-independent runtime
 
-**Status:** J0–J7 COMPLETE; J8 ACTIVE
+**Status:** COMPLETE 2026-07-27
 **Parent:** `2026-07-24-modern-runtime-architecture.md`, Slice J
 **Authorization:** the user approved Slices F–L, including the otherwise-frozen
 Slice J gameplay-owner moves, on 2026-07-24
@@ -416,7 +416,7 @@ git revert ce41efb9e5938f79a7580476b949d172f52a1e69
 
 **Detailed execution plan:**
 [`2026-07-26-modern-runtime-slice-j8.md`](2026-07-26-modern-runtime-slice-j8.md).
-Implementation is active after J7's 2026-07-27 physical-display acceptance.
+Completed at `a9a822f2` after J7's 2026-07-27 physical-display acceptance.
 
 - Build a transport/content test host that constructs Runtime directly.
 - Connect, enter world, receive chat/inventory/world updates, move, use,
@@ -433,6 +433,16 @@ integration, resource teardown, packet/order/timing parity, and the user visual
 matrix all pass. Slice K may then build the Linux multi-session host without
 another gameplay extraction.
 
+J8 passes 395 Runtime tests, 3,731 App tests / 3 skips, 8,696 complete-solution
+tests / 5 skips, the exact-binary lifecycle/reconnect route, and the canonical
+nine-stop route. Graphical and direct hosts share one `GameRuntime`, one
+retryable canonical-generation reset transaction, and the same gameplay-owner
+graph. Exact rollback:
+
+```text
+git revert a9a822f206cc6021bc099988144488f3bd7c397b
+```
+
 ## 5. Commit order
 
 1. `arch(runtime): establish presentation-independent boundary`

docs/plans/2026-07-26-modern-runtime-slice-j8.md

@@ -1,6 +1,6 @@
 # Modern runtime Slice J8 — no-window integration and Slice J closeout
 
-**Status:** ACTIVE — J7 ENTRY GATE PASSED 2026-07-27
+**Status:** COMPLETE 2026-07-27 — SLICE J CLOSED
 **Parent:** `2026-07-25-modern-runtime-slice-j.md`, J8
 **Authorization:** the user approved Slices F–L, including the J gameplay-owner
 gates, on 2026-07-24
@@ -139,6 +139,11 @@ increasing within a generation and restart only when the generation changes.
 
 ### J8.1 — one direct root host
 
+**Complete at `a9a822f2`.** `RuntimeGenerationReset` is the single retryable
+canonical-generation reset transaction. Graphical App reset borrows that
+transaction and retains only its presentation stages; the no-window host uses
+the same Runtime root and reset owner directly.
+
 - Add the Runtime-owned generation-reset transaction and its narrow borrowed
   host-retirement acknowledgement.
 - Replace the child-by-child canonical portions of App's reset bindings with
@@ -162,6 +167,11 @@ generation, and converges without a presentation assembly or duplicate owner.
 
 ### J8.2 — deterministic transport/content lifecycle
 
+**Complete at `a9a822f2`.** `NoWindowGameRuntimeHost` drives the production
+root through connect, enter, decoded state, movement, use, combat, casting,
+projectile work, portal completion, stop, reconnect, stale-route rejection,
+GUID reuse, and terminal convergence.
+
 - Build deterministic session operations and in-memory transport.
 - Bind the exact session lifecycle order:
   reset → attach inbound → connect → select identity → enter → activate
@@ -180,6 +190,11 @@ root, accepted ordering is stable, and old-generation routes are inert.
 
 ### J8.3 — cancellation, faults, isolation, and credentials
 
+**Complete at `a9a822f2`.** Focused gates cover reset retry/no-replay,
+portal cancellation before and after readiness, observer failure containment,
+two simultaneous isolated roots, stale-generation routes, and
+credential-safe traces.
+
 - Cancel during connect, after inbound attach, during portal readiness, and
   with a host acknowledgement pending.
 - Inject route-construction, route-detach, observer, projection
@@ -196,6 +211,24 @@ credential-safe.
 
 ### J8.4 — complete Slice J gate
 
+**Complete.** The exact committed binary passed:
+
+- 395/395 Runtime tests;
+- 3,731 App tests / 3 skips;
+- 8,696 complete-solution tests / 5 intentional skips;
+- connected lifecycle/reconnect:
+  `logs/connected-world-gate-20260727-004418/report.json`;
+- canonical nine-stop route:
+  `logs/connected-r6-soak-20260727-004942.report.json`;
+- the already accepted J7 physical-display matrix.
+
+The no-window process loads no App, UI, renderer, audio, Silk.NET, OpenAL,
+Arch, or ImGui assembly. The dependency and divergence audits found no new
+retail deviation. Retail chat-history research also confirmed that session
+end does not clear the bounded transcript: `CPlayerSystem::OnEndCharacterSession`
+at `0x00562870` reinitializes the character session, while the explicit
+`ClientCommunicationSystem::DoClear` at `0x0056E600` owns chat-buffer clearing.
+
 - Run focused Runtime tests.
 - Run the Release solution build.
 - Run the complete Release suite.
@@ -254,10 +287,14 @@ extracting gameplay again.
 
 ## 7. Commit and rollback discipline
 
-J8 implementation lands as one test/integration closeout commit after the J7
+J8 implementation landed as one test/integration closeout commit after the J7
-visual entry gate, followed by one documentation closeout commit if needed.
+visual entry gate. Its exact rollback is:
-The full production SHA and exact `git revert <sha>` are recorded here before
+
-Slice K starts. J8 must not modify the J7 rollback point:
+```text
+git revert a9a822f206cc6021bc099988144488f3bd7c397b
+```
+
+J8 did not modify the J7 rollback point:
 
 ```text
 git revert ce41efb9e5938f79a7580476b949d172f52a1e69

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

@@ -1,6 +1,6 @@
 # Modern runtime Slice K — Linux headless and multi-session host
 
-**Status:** PREPARED — BEGINS AFTER SLICE J CLOSEOUT
+**Status:** ACTIVE 2026-07-27 — SLICE J ENTRY GATE PASSED
 **Parent:** `2026-07-24-modern-runtime-architecture.md`, Slice K
 **Authorization:** the user approved Slices F–L on 2026-07-24
 **Purpose:** run efficient automated clients on Linux without a display, GPU,
@@ -9,10 +9,14 @@ prove 30 isolated sessions can share immutable content safely in one process.
 
 ## 1. Entry contract
 
-Slice K starts only after J8 proves one direct `GameRuntime` can connect, enter
+Slice K starts after J8 proves one direct `GameRuntime` can connect, enter
 world, receive authoritative state, move, use, fight/cast, portal, stop,
 reconnect, and converge without presentation assemblies.
 
+That entry gate passed at `a9a822f2`: 395 Runtime tests, 3,731 App tests /
+3 skips, 8,696 complete-solution tests / 5 skips, exact-binary connected
+lifecycle/reconnect, and canonical nine-stop routes all pass.
+
 K adds a production host over that same root. It does not move gameplay out of
 App again and does not create a bot-specific world model.
 

docs/research/2026-07-27-slice-j8-no-window-closeout.md

@@ -0,0 +1,94 @@
+# Slice J8 no-window integration and Slice J closeout
+
+## Outcome
+
+Slice J closed at `a9a822f206cc6021bc099988144488f3bd7c397b`.
+The graphical client and direct no-window host now construct and borrow the
+same `GameRuntime`, canonical gameplay owners, generation token, and retryable
+generation-reset transaction. No gameplay model or GUID map was duplicated.
+
+Exact rollback:
+
+```text
+git revert a9a822f206cc6021bc099988144488f3bd7c397b
+```
+
+## Canonical reset ownership
+
+`RuntimeGenerationReset` owns the exact-generation reset order for transit,
+commands, containers, actions, movement, object tables, character, item mana,
+social state, entity retirement, host-projection acknowledgement, canonical
+entity completion, chat identity, snapshots, and player identity.
+
+The reset is a retained-cursor transaction:
+
+- completed stages never replay after a callback failure;
+- entity retirement uses exact `RuntimeEntityKey` incarnations;
+- canonical identity clears only after Runtime and host projections converge;
+- duplicate completed reset is inert;
+- re-entry or host replacement for an active generation is rejected.
+
+The graphical reset manifest invokes this transaction once and retains only
+App presentation cleanup. `NoWindowGameRuntimeHost` invokes the same Runtime
+transaction without loading App or a presentation backend.
+
+## Direct-host proof
+
+The deterministic no-window scenario covers:
+
+- connect, character selection, enter world, and outbound activation;
+- entity/object/inventory/chat/vital/environment/movement state;
+- movement, use, attack, cast, projectile, and portal operations;
+- portal host acknowledgement;
+- graceful stop, reconnect, stale-route rejection, and GUID reuse;
+- reset retry/no-replay and portal cancellation before/after readiness;
+- observer-failure containment;
+- two simultaneous roots with isolated credentials, clocks, GUIDs, items,
+  chat, spells, projectiles, portals, and teardown;
+- credential-safe traces with no password text;
+- terminal zero ownership and backlog convergence.
+
+The direct test process loads no App, UI, renderer, audio, Silk.NET, OpenAL,
+Arch, or ImGui assembly.
+
+## Retail chat-history decision
+
+The integrated reconnect trace retains the bounded chat transcript while
+clearing active command targets and character identity. This matches the named
+retail ownership:
+
+- `CPlayerSystem::OnEndCharacterSession` at `0x00562870` ends and begins the
+  character session.
+- `ClientUISystem::OnEndCharacterSession` at `0x00564AD0` calls
+  `ClientUISystem::CleanUpGameUI` at `0x005648A0`.
+- That cleanup clears trade, vendor, ground-container, and selection state;
+  it does not clear the chat buffer.
+- Explicit `ClientCommunicationSystem::DoClear` at `0x0056E600` owns the
+  clear-chat-buffer notice.
+
+No reconnect-time chat purge was added.
+
+## Acceptance evidence
+
+- Runtime tests: 395/395.
+- App tests: 3,731 pass / 3 intentional skips.
+- Complete Release solution: 8,696 pass / 5 intentional skips.
+- Connected lifecycle/reconnect:
+  `logs/connected-world-gate-20260727-004418/report.json`.
+- Canonical nine-stop:
+  `logs/connected-r6-soak-20260727-004942.report.json`.
+- J7's exact graphical visual matrix was accepted by the user on 2026-07-27.
+
+The connected routes exited gracefully with zero failures and no pending
+publication, retirement, upload, warmup, or ownership backlog. Population-
+sensitive object/particle counts and missing-DAT VFX diagnostics were recorded
+but did not violate the route invariants.
+
+## Audits
+
+- Dependency closure: pass.
+- Presentation/backend assembly isolation: pass.
+- Duplicate canonical constructors/maps: none.
+- Mutable process-wide session state: none introduced.
+- Teardown ledger convergence: pass.
+- Retail divergence register: no new behavioral divergence.