docs(architecture): record landblock cutover

Mark Slice 5G complete, record the 44 percent GameWindow reduction and origin-lifetime barrier, and advance the active ledger to deterministic and connected closeout.

AGENTS.md

@@ -115,7 +115,7 @@ and the final two-client portal-out/materialization observer flow are
 user-gated. Deterministic world-lifecycle automation protects fresh login,
 outdoor/world-edge/dungeon travel, same-location revisit, exact graceful
 disconnect, and uncapped fresh-process reconnect with JSON/PNG artifacts.
-Release builds; 6,940 tests pass / 5 skip.
+Release builds; 7,052 tests pass / 5 skip.
 
 **Active prerequisite before new M4 subsystem work:** continue the
 behavior-preserving `GameWindow` decomposition reconciled on 2026-07-21.
@@ -123,9 +123,12 @@ Selection/interaction Slice 1, live-animation-presentation Slice 2, complete
 live-session ownership Slice 3, and live-entity App integration Slice 4 are
 landed. Focused hydration, teardown, inbound-authority, network-update, and
 motion-runtime owners now sit over canonical `LiveEntityRuntime` without a
-second GUID dictionary. `GameWindow` is 10,301 lines, 267 fields, and 163
-methods. Slice 5 extracts landblock presentation next; later slices finish
-update/render orchestration and composition cleanup.
+second GUID dictionary. Slice 5 checkpoints A–G have moved the complete DAT
+build, render/physics/static publication, retryable retirement, and shared-
+origin lifetime barrier out of `GameWindow`; it is now 8,793 raw lines, down
+44% from the 15,723-line campaign baseline. Slice 5H lifecycle/connected
+closeout is active; later slices finish update/render orchestration and
+composition cleanup.
 See `docs/architecture/code-structure.md`. **Carried:** #153, #116, remaining
 R6 ownership cleanup, TS-50/TS-51, Modern Pipeline MP1b+, and #225's
 lifestone/particle alpha visual gate.