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

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+# 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.