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>

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
-visual entry gate, followed by one documentation closeout commit if needed.
-The full production SHA and exact `git revert <sha>` are recorded here before
-Slice K starts. J8 must not modify the J7 rollback point:
+J8 implementation landed as one test/integration closeout commit after the J7
+visual entry gate. Its exact rollback is:
+
+```text
+git revert a9a822f206cc6021bc099988144488f3bd7c397b
+```
+
+J8 did not modify the J7 rollback point:
 
 ```text
 git revert ce41efb9e5938f79a7580476b949d172f52a1e69