docs(runtime): close J3.3 and hand off J3.4

Record exact projection-store ownership, automated and connected evidence, rollback chain, and the executor-ready canonical object-table plan. Reconcile milestones, roadmap, architecture, divergence pointers, AGENTS/CLAUDE, and durable handoff state.

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

docs/README.md

@@ -4,7 +4,7 @@ This page is the entry point for project documentation. It distinguishes
 current sources of truth from implementation history so an old plan or issue
 banner cannot silently override the current program state.
 
-## Current snapshot — 2026-07-24
+## Current snapshot — 2026-07-25
 
 - **Milestone state:** M3, “Cast a spell,” landed 2026-07-21. M4, “Live in the
   world,” is active.
@@ -14,38 +14,32 @@ banner cannot silently override the current program state.
   [`plans/2026-07-23-world-interaction-completion.md`](plans/2026-07-23-world-interaction-completion.md).
   The eight-slice `GameWindow` decomposition and its connected visual matrix
   are complete.
-- **Current active engineering program:** Slices A–E of
+- **Current active engineering program:** Slices A–I and J0–J3.3 of
   [`plans/2026-07-24-modern-runtime-architecture.md`](plans/2026-07-24-modern-runtime-architecture.md)
-  are complete. Production world-mesh streaming consumes the validated
-  prepared package, typed residency is bounded/accounted, and streaming now
-  has typed admission plus immediate old-generation quiescence, metered
-  retirement, and retained cursor-budgeted publication across render, physics,
-  statics, building registries, collision/reflood, and EnvCells. The canonical
-  reveal generation now owns an exact destination reservation across every
-  typed budget dimension; incomplete destinations remain in portal space and
-  receive retail's centered wait cue instead of forced early reveal. E6's
-  deterministic/resource gates and capped, uncapped, and dense-Arwic
-  physical-local routes pass. Slices F–L, including the F/G and J approval
-  gates, were explicitly authorized 2026-07-24; Slice F is active.
-  Their post-E evidence, ownership map, shadow-comparison design, cutover
-  sequence, and acceptance matrix are implementation-ready in the
-  [F/G render-scene plan](plans/2026-07-24-modern-runtime-slices-f-g-render-scene.md).
-  See also the [Slice E streaming report](research/2026-07-24-slice-e-cost-budgeted-streaming-report.md).
+  are complete. Production uses prepared world/collision packages, typed
+  residence, retained render-scene/delta submission, bounded frame owners, and
+  flat-authoritative collision without parsed-graph production residency.
+  Runtime owns canonical session/transport and the sole live-entity
+  GUID/incarnation/local-ID directory. App materialized projections,
+  presentation worksets, and spatial visibility carry exact
+  `RuntimeEntityKey`. J3.4 canonical object-table ownership is next in
+  [`plans/2026-07-25-modern-runtime-slice-j3-object-table.md`](plans/2026-07-25-modern-runtime-slice-j3-object-table.md).
 - **Completed gates:** R6 locomotion/collision/projectile/teleport/radar and
   the final two-client portal-out/materialization observer comparison (`#218`).
 - **Separate visual verification:** the shared-alpha lifestone/particle result
   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:** render ECS/MP3 is executing from the
-  implementation-ready F/G plan, followed by the approved Linux/headless
-  automation slices. The pre-F/G runtime rollback anchor is `e7d9d6fa`.
+- **Active engineering track:** complete Slice J's coherent Runtime lifetime
+  groups, then build the approved Linux/headless multi-session host in Slice K.
+  J3.3's exact rollback is `git revert e937cc36` followed by
+  `git revert 420e5eea`.
 - **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; 8,164 tests pass and
-  five are intentionally skipped. The capped, uncapped, and dense-Arwic
-  physical prepared-asset routes all completed their portal/input/lifetime
-  assertions and disconnected gracefully.
+- **Latest automated baseline:** Release build succeeds; 8,444 tests pass and
+  five are intentionally skipped. The exact J3.3 connected lifecycle/reconnect
+  gate completed two sessions and seven checkpoints with graceful zero-code
+  exits, zero failures, zero render-shadow mismatches, and zero pending deltas.
 
 ## Sources of truth