docs(runtime): close projectile ownership

AGENTS.md

@@ -116,7 +116,7 @@ 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; the current performance-program checkpoint passes
-3,836 App tests / 3 skips and 8,413 complete-solution tests / 5 skips.
+3,718 App tests / 3 skips and 8,591 complete-solution tests / 5 skips.
 
 **M4 feature work order (paused while the authorized performance program
 executes):** the six-slice pre-M4 world-interaction completion
@@ -303,7 +303,14 @@ and full-cell commits. App publishes prepared collision and projects committed
 snapshots only. Runtime tests pass 314/314, App tests pass 3,718/3 skips, the
 complete Release suite passes 8,588/5 skips, and both exact-binary
 lifecycle/reconnect and canonical nine-stop collision/movement gates pass
-with graceful exits and zero failures. J5.6 projectile runtime is active.
+with graceful exits and zero failures. J5.6 is complete at `2aee3356`:
+Runtime owns the canonical projectile component/workset,
+prediction/correction state, and unchanged retail projectile simulation while
+App resolves immutable DAT shape data and projects committed frames. Runtime
+tests pass 317/317, App tests pass 3,718/3 skips, 47 focused Core projectile
+tests pass, the complete Release suite passes 8,591/5 skips, and the exact
+arrow/bolt/spell, lifecycle/reconnect, and canonical nine-stop gates pass with
+graceful exits and zero failures. J5.7 cleanup and closeout is active.
 J0's rollback is
 `git revert b632672e5ccabfb44c551e08f1c411ab2669c44a`.
 J1's rollback is
@@ -341,6 +348,8 @@ J5.4's rollback is
 `git revert aa3f4a60f87f2cbebc3d8ecd5e33d779b7fb13c1`.
 J5.5's rollback is
 `git revert 7e6033d0adcd0b572c20e89dd275746fb442d52f`.
+J5.6's rollback is
+`git revert 2aee33569f0268d7bc0f4f52437dfa0b405432a4`.
 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
@@ -360,7 +369,9 @@ closeout is `docs/research/2026-07-26-slice-j5-3-combat-magic-intent.md`; J5.4
 closeout is
 `docs/research/2026-07-26-slice-j5-4-local-movement-ownership.md`; J5.5
 closeout is
-`docs/research/2026-07-26-slice-j5-5-physics-remote-ownership.md`. The exact G4
+`docs/research/2026-07-26-slice-j5-5-physics-remote-ownership.md`; J5.6
+closeout is
+`docs/research/2026-07-26-slice-j5-6-projectile-ownership.md`. The exact G4
 visual rollback
 is `git revert ef1d263337997bb030eadb7b8e71d73dc659907a`; do not revert G3 or
 the portal-warmup corrections. Evidence:

CLAUDE.md

@@ -114,7 +114,7 @@ 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; the current performance-program checkpoint passes
-3,836 App tests / 3 skips and 8,413 complete-solution tests / 5 skips.
+3,718 App tests / 3 skips and 8,591 complete-solution tests / 5 skips.
 
 **M4 feature work order (paused while the authorized performance program
 executes):** the six-slice pre-M4 world-interaction completion
@@ -301,7 +301,14 @@ and full-cell commits. App publishes prepared collision and projects committed
 snapshots only. Runtime tests pass 314/314, App tests pass 3,718/3 skips, the
 complete Release suite passes 8,588/5 skips, and both exact-binary
 lifecycle/reconnect and canonical nine-stop collision/movement gates pass
-with graceful exits and zero failures. J5.6 projectile runtime is active.
+with graceful exits and zero failures. J5.6 is complete at `2aee3356`:
+Runtime owns the canonical projectile component/workset,
+prediction/correction state, and unchanged retail projectile simulation while
+App resolves immutable DAT shape data and projects committed frames. Runtime
+tests pass 317/317, App tests pass 3,718/3 skips, 47 focused Core projectile
+tests pass, the complete Release suite passes 8,591/5 skips, and the exact
+arrow/bolt/spell, lifecycle/reconnect, and canonical nine-stop gates pass with
+graceful exits and zero failures. J5.7 cleanup and closeout is active.
 J0's rollback is
 `git revert b632672e5ccabfb44c551e08f1c411ab2669c44a`.
 J1's rollback is
@@ -339,6 +346,8 @@ J5.4's rollback is
 `git revert aa3f4a60f87f2cbebc3d8ecd5e33d779b7fb13c1`.
 J5.5's rollback is
 `git revert 7e6033d0adcd0b572c20e89dd275746fb442d52f`.
+J5.6's rollback is
+`git revert 2aee33569f0268d7bc0f4f52437dfa0b405432a4`.
 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
@@ -358,7 +367,9 @@ closeout is `docs/research/2026-07-26-slice-j5-3-combat-magic-intent.md`; J5.4
 closeout is
 `docs/research/2026-07-26-slice-j5-4-local-movement-ownership.md`; J5.5
 closeout is
-`docs/research/2026-07-26-slice-j5-5-physics-remote-ownership.md`. The exact G4
+`docs/research/2026-07-26-slice-j5-5-physics-remote-ownership.md`; J5.6
+closeout is
+`docs/research/2026-07-26-slice-j5-6-projectile-ownership.md`. The exact G4
 visual rollback
 is `git revert ef1d263337997bb030eadb7b8e71d73dc659907a`; do not revert G3 or
 the portal-warmup corrections. Evidence:

docs/README.md

@@ -14,7 +14,7 @@ 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–I, J0–J4, and J5.1–J5.5 of
+- **Current active engineering program:** Slices A–I, J0–J4, and J5.1–J5.6 of
   [`plans/2026-07-24-modern-runtime-architecture.md`](plans/2026-07-24-modern-runtime-architecture.md)
   are complete. Production uses prepared world/collision packages, typed
   residence, retained render-scene/delta submission, bounded frame owners, and
@@ -23,8 +23,8 @@ banner cannot silently override the current program state.
   gameplay state, selection/interaction transactions, and combat/magic intent.
   App materialized projections and retained widgets borrow exact Runtime
   identity and action owners. Runtime also owns the sole per-session physics,
-  collision, body/host, remote simulation, and cell-commit graph. J5.6
+  collision, body/host, remote/projectile simulation, and cell-commit graph.
-  projectile runtime is next in
+  J5.7 ownership cleanup and closeout is active in
   [`plans/2026-07-26-modern-runtime-slice-j5.md`](plans/2026-07-26-modern-runtime-slice-j5.md).
 - **Completed gates:** R6 locomotion/collision/projectile/teleport/radar and
   the final two-client portal-out/materialization observer comparison (`#218`).
@@ -34,15 +34,14 @@ banner cannot silently override the current program state.
   `#116` (two narrowed slide-response cases), and divergence rows TS-50/TS-51.
 - **Active engineering track:** complete Slice J's coherent Runtime lifetime
   groups, then build the approved Linux/headless multi-session host in Slice K.
-  J5.5's exact rollback is
+  J5.6's exact rollback is
-  `git revert 7e6033d0adcd0b572c20e89dd275746fb442d52f`.
+  `git revert 2aee33569f0268d7bc0f4f52437dfa0b405432a4`.
 - **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; 8,588 tests pass and
+- **Latest automated baseline:** Release build succeeds; 8,591 tests pass and
-  five are intentionally skipped. The exact J5.5 connected lifecycle/reconnect
+  five are intentionally skipped. The exact J5.6 arrow/bolt/spell,
-  gate completed two sessions and seven checkpoints, and its canonical
+  lifecycle/reconnect, and canonical nine-stop gates complete with graceful
-  nine-stop movement route completed all destinations and movement exercises,
+  zero-code exits and zero failures.
-  with graceful zero-code exits and zero failures.
 
 ## Sources of truth
 

docs/architecture/acdream-architecture.md

@@ -236,7 +236,9 @@ src/
                                 collision receipts, bodies/hosts/worksets
       RuntimeRemotePhysicsUpdater.cs -> presentation-free remote simulation
       RuntimeOrdinaryPhysicsUpdater.cs -> presentation-free object simulation
-    -> J3–J4 and J5.1–J5.5 complete; J5.6 projectile runtime active
+      RuntimeProjectile.cs -> canonical projectile component/prediction owner
+      RuntimeProjectilePhysicsUpdater.cs -> presentation-free projectile simulation
+    -> J3–J4 and J5.1–J5.6 complete; J5.7 cleanup/closeout active
     -> may reference Core, Core.Net, Content, and Plugin.Abstractions only
     -> must never reference App, UI, Silk.NET, OpenAL, Arch, or ImGui
   
@@ -486,9 +488,9 @@ versions, and exact tombstones. `RuntimeEntityRecord` is presentation-free.
 an App record. `MaterializeLiveEntity` claims the Runtime local ID and creates
 one graphical `LiveEntityRecord` sidecar in `LiveEntityProjectionStore`, keyed
 by exact `RuntimeEntityKey` (local ID plus `INSTANCE_TS`). The sidecar owns the
-App animation, remote-motion, projectile, hydration, and effect presentation
+App animation, hydration, and effect/render presentation state.
-state. `RuntimeEntityRecord` deliberately still carries the canonical
+`RuntimeEntityRecord` owns the canonical `PhysicsBody`, physics host, remote
-`PhysicsBody`/physics-host facts until their coherent J5 move.
+motion, projectile component, clocks, state, and full cell.
 Live `PhysicsDesc` effect fields replace Setup defaults on that same exact
 sidecar; rebucketing never recreates it.
 
@@ -517,8 +519,11 @@ MTS/jump/AP cadence lives in Runtime (`aa3f4a60`). One
 graph, transition scratch, shadow registry, typed collision admissions,
 canonical body/host/remote components, ordinary/remote worksets, simulation,
 and full-cell commits. App supplies prepared collision and animation/shape
-inputs, then projects committed snapshots (`7e6033d0`). J5.6 next moves the
+inputs, then projects committed snapshots (`7e6033d0`). The same Runtime
-projectile component and prediction lifecycle.
+physics owner now owns the canonical projectile component, exact-key workset,
+prediction/correction lifecycle, retail projectile simulation, and cell
+commits. App resolves immutable Setup/DAT collision shape data and projects
+committed render, shadow, and effect-pose results only (`2aee3356`).
 
 `GpuWorldState` owns spatial buckets only and retains the exact projection key
 through loaded/pending movement, landblock retirement/reload, origin recenter,

docs/architecture/code-structure.md

@@ -476,9 +476,10 @@ useful ordering seam, but its ownership status is **partial**.
 | Retained gameplay UI | **Mostly complete feature ownership** | `RetailUiRuntime` and focused panel/controllers own layout and behavior. `GameWindow.OnLoad` still performs substantial service composition, which is allowed until the final composition cleanup. |
 | Action/combat/magic/movement | **J5.1–J5.4 complete** | Runtime `RuntimeActionState` owns the exact selection, temporary target mode, interaction transactions, combat attack/target/mode, and spell-cast intent children. Interaction owns use/appraisal/pickup identity, ordered FIFO, and exact post-arrival token while borrowing J4's sole busy gate. `RuntimeLocalPlayerMovementState` owns the exact local controller, construction seam, autorun latch, typed view, and outbound MTS/jump/AP cadence. Retained bars, physical input, world/content queries, transport, lighting, toasts, drag/drop, effects, and animation remain App adapters/presentation. No parallel App owner remains (`b298f99f`, `f5f7b417`, `20df9d15`, `aa3f4a60`). |
 | Physics/remote simulation | **J5.5 complete** | `RuntimePhysicsState` owns one per-session engine, production cache/cell graph, transition scratch, shadow registry, typed collision admissions, canonical bodies/hosts/remotes, keyed ordinary/remote worksets, simulation, and cell commits. App streaming supplies immutable prepared collision; animation/shape adapters supply graphical inputs and project committed snapshots only (`7e6033d0`). |
+| 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 J5.6** | Canonical identity, retained-object lifetime, direct views, ordered entity/object deltas, J4 gameplay state, J5.1–J5.4 action/combat/magic/movement state, and J5.5 physics/remote simulation share failure-safe Runtime owners while exact graphical sidecars stay in App. J5.6–J7 move projectiles and finish cleanup before one Runtime composition root. |
+| Unified `GameEntity` | **Slice J active at J5.7** | Canonical identity, retained-object lifetime, direct views, ordered entity/object deltas, J4 gameplay state, J5 action/combat/magic/movement/physics/remote/projectile simulation share failure-safe Runtime owners while exact graphical sidecars stay in App. J5.7 removes remaining temporary seams and proves no-window parity before J6–J7 add world handshakes and one Runtime composition root. |
 
 ### 4.3 Revised extraction sequence
 

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

@@ -1,6 +1,6 @@
 # acdream — strategic roadmap
 
-**Status:** Living document. Updated 2026-07-26. **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`, and J5.5 per-session physics/remote simulation at `7e6033d0`. J5.6 projectile runtime is active. Issue #225's lifestone/particle alpha comparison remains a separate rendering visual gate.
+**Status:** Living document. Updated 2026-07-26. **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`, and J5.6 projectile simulation at `2aee3356`. J5.7 cleanup and closeout 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.
 
 ---
@@ -1764,7 +1764,14 @@ port in any phase — no separate listing here.
 > App publishes prepared collision and projects committed snapshots. Its 314
 > Runtime tests, 3,718 App tests / 3 skips, 8,588-test / 5-skip complete
 > Release suite, exact-binary lifecycle/reconnect gate, and canonical
-> nine-stop collision/movement route pass. J5.6 projectile runtime is active.
+> nine-stop collision/movement route pass. J5.6 is complete at `2aee3356`:
+> Runtime owns the canonical projectile component/workset,
+> prediction/correction state, and unchanged retail projectile simulation
+> while App resolves immutable DAT shape data and projects committed frames.
+> Its 317 Runtime tests, 3,718 App tests / 3 skips, 47 focused Core projectile
+> tests, 8,591-test / 5-skip complete Release suite, exact arrow/bolt/spell
+> evidence, lifecycle/reconnect gate, and canonical nine-stop route pass.
+> J5.7 cleanup and closeout is active.
 > The historical exact cutover
 > rollback remains
 > `git revert ef1d263337997bb030eadb7b8e71d73dc659907a`. Slice H is complete:

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

@@ -239,7 +239,13 @@ residency is `0/0/0` at every stable checkpoint and teardown converges. Slice I
   commits; App publishes prepared collision and projects committed snapshots.
   Its 314 Runtime tests, 3,718 App tests / 3 skips, 8,588 full Release tests /
   5 skips, exact-binary lifecycle/reconnect route, and canonical nine-stop
-  collision/movement route pass. J5.6 projectile ownership is active under
+  collision/movement route pass. J5.6 completed at `2aee3356`: Runtime owns
+  the canonical projectile component/workset, prediction/correction state,
+  and unchanged retail projectile simulation while App resolves immutable DAT
+  shape inputs and projects committed frames. Its 317 Runtime tests, 3,718
+  App tests / 3 skips, 47 focused Core projectile tests, 8,591 full Release
+  tests / 5 skips, exact arrow/bolt/spell evidence, lifecycle/reconnect route,
+  and canonical nine-stop route pass. J5.7 cleanup and closeout is active under
   [`2026-07-25-modern-runtime-slice-j.md`](2026-07-25-modern-runtime-slice-j.md).
 Slice-I closeout evidence is
 [`../research/2026-07-25-slice-i7-closeout.md`](../research/2026-07-25-slice-i7-closeout.md).
@@ -271,6 +277,8 @@ Slice-J5.4 closeout evidence is
 [`../research/2026-07-26-slice-j5-4-local-movement-ownership.md`](../research/2026-07-26-slice-j5-4-local-movement-ownership.md).
 Slice-J5.5 closeout evidence is
 [`../research/2026-07-26-slice-j5-5-physics-remote-ownership.md`](../research/2026-07-26-slice-j5-5-physics-remote-ownership.md).
+Slice-J5.6 closeout evidence is
+[`../research/2026-07-26-slice-j5-6-projectile-ownership.md`](../research/2026-07-26-slice-j5-6-projectile-ownership.md).
 The historical exact G4 visual rollback remains
 `git revert ef1d263337997bb030eadb7b8e71d73dc659907a`.
 

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

@@ -2,7 +2,7 @@
 
 **Date:** 2026-07-24
 
-**Status:** Slices A–I, J0–J4, and J5.1–J5.5 are complete. Flat-authoritative collision, zero-
+**Status:** Slices A–I, J0–J4, and J5.1–J5.6 are complete. Flat-authoritative collision, zero-
 allocation resolve scratch, parsed-graph removal, connected correctness/
 lifetime acceptance, and Slice-I closeout landed 2026-07-25. Slices F–L were
 explicitly approved 2026-07-24. Slice J0–J1 established the enforced Runtime
@@ -16,10 +16,11 @@ ownership into Runtime at `011efbea`; J4.3 moved the coupled magic/player-sheet
 owner into Runtime at `d02a12ce`; J4.4 moved character settings/projections
 and the shared typed state-command seam at `dcb61efb`; J4.5 closed canonical
 gameplay-state ownership at `89e6b207`. J5 movement, physics, interaction,
-and combat ownership is active at J5.6 after canonical action state
+and combat ownership is active at J5.7 after canonical action state
 (`b298f99f`), interaction transactions (`f5f7b417`), and combat/magic intent
 (`20df9d15`), local movement/outbound cadence (`aa3f4a60`), and per-session
-physics/remote simulation (`7e6033d0`) moved to Runtime.
+physics/remote simulation (`7e6033d0`), and projectile simulation
+(`2aee3356`) moved to Runtime.
 
 **Scope:** Reconcile and sequence the existing Modern Pipeline (`MP`) and
 Linux/headless (`LH`) tracks using the 2026-07-24 connected performance audit.
@@ -1277,7 +1278,7 @@ single Runtime shortcut/spellbook/inventory owners, graphical/no-window
 command parity, failure-safe combined ledger, 8,544-test Release suite,
 exact-binary lifecycle/reconnect gate, and canonical nine-stop route pass.
 J5 movement/physics/interaction/combat ownership is the current execution
-point. J5.1–J5.5 are complete; J5.6 projectile runtime is active.
+point. J5.1–J5.6 are complete; J5.7 cleanup and closeout is active.
 Evidence:
 [`../research/2026-07-25-slice-g5-production-profile.md`](../research/2026-07-25-slice-g5-production-profile.md)
 and
@@ -1297,6 +1298,8 @@ and
 and
 [`../research/2026-07-26-slice-j3-6-lifetime-closeout.md`](../research/2026-07-26-slice-j3-6-lifetime-closeout.md)
 and
+[`../research/2026-07-26-slice-j5-6-projectile-ownership.md`](../research/2026-07-26-slice-j5-6-projectile-ownership.md)
+and
 [`2026-07-25-modern-runtime-slice-j.md`](2026-07-25-modern-runtime-slice-j.md).
 
 The intended order is therefore:

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

@@ -311,7 +311,13 @@ scratch/shadow/collision/body/host/remote/workset graph; App publishes
 prepared collision and projects committed snapshots. Its 314 Runtime tests,
 3,718 App tests / 3 skips, 8,588 complete Release tests / 5 skips,
 exact-binary lifecycle/reconnect gate, and canonical nine-stop collision/
-movement route pass. J5.6 projectile runtime is next. Evidence:
+movement route pass. J5.6 completed at `2aee3356`: Runtime owns the canonical
+projectile component, exact-key workset, prediction/correction state, and
+retail projectile simulation; App resolves immutable DAT shape data and
+projects committed frames only. Its 317 Runtime tests, 3,718 App tests / 3
+skips, 47 focused Core projectile tests, 8,591 complete Release tests / 5
+skips, exact arrow/bolt/spell evidence, lifecycle/reconnect gate, and canonical
+nine-stop route pass. J5.7 ownership cleanup and closeout is active. Evidence:
 [`../research/2026-07-26-slice-j5-1-canonical-action-state.md`](../research/2026-07-26-slice-j5-1-canonical-action-state.md)
 and
 [`../research/2026-07-26-slice-j5-2-interaction-transactions.md`](../research/2026-07-26-slice-j5-2-interaction-transactions.md)
@@ -320,7 +326,9 @@ and
 and
 [`../research/2026-07-26-slice-j5-4-local-movement-ownership.md`](../research/2026-07-26-slice-j5-4-local-movement-ownership.md)
 and
-[`../research/2026-07-26-slice-j5-5-physics-remote-ownership.md`](../research/2026-07-26-slice-j5-5-physics-remote-ownership.md).
+[`../research/2026-07-26-slice-j5-5-physics-remote-ownership.md`](../research/2026-07-26-slice-j5-5-physics-remote-ownership.md)
+and
+[`../research/2026-07-26-slice-j5-6-projectile-ownership.md`](../research/2026-07-26-slice-j5-6-projectile-ownership.md).
 
 - Move presentation-free movement interpretation, authoritative/predicted
   physics state, selection identity, approach/use transactions, combat intent,

docs/plans/2026-07-26-modern-runtime-slice-j5.md

@@ -1,6 +1,6 @@
 # Modern runtime Slice J5 — movement, physics, interaction, and combat
 
-**Status:** ACTIVE — J5.1–J5.5 complete; J5.6 next
+**Status:** ACTIVE — J5.1–J5.6 complete; J5.7 next
 **Parent:** `2026-07-25-modern-runtime-slice-j.md`, J5
 **Production base:** `2c67a2c3`
 **Authorization:** the user approved Slices F–L, including the Slice J
@@ -90,8 +90,8 @@ commands to Runtime. The camera may not write the player heading directly.
 | J5.3 combat and magic intent | complete | `20df9d155db50706a42420d60a9b15861cf4bfe7`; exact Runtime attack/mode/target/cast owners; 223 Runtime tests, 3,754 App tests / 3 skips, 8,566 complete Release tests / 5 skips, exact-binary connected lifecycle/reconnect pass |
 | J5.4 local movement and outbound cadence | complete | `aa3f4a60f87f2cbebc3d8ecd5e33d779b7fb13c1`; one Runtime movement/controller/cadence owner; 303 Runtime tests, 3,716 App tests / 3 skips, 8,575 complete Release tests / 5 skips, exact-binary lifecycle/reconnect and nine-stop movement gates pass |
 | J5.5 per-session physics and remote simulation | complete | `7e6033d0adcd0b572c20e89dd275746fb442d52f`; one Runtime engine/cache/scratch/shadow/body/host/remote/workset owner; 314 Runtime tests, 3,718 App tests / 3 skips, 8,588 complete Release tests / 5 skips, exact-binary lifecycle/reconnect and nine-stop collision/movement gates pass |
-| J5.6 projectile runtime | active | canonical component/simulation plus App projection acknowledgements |
+| J5.6 projectile runtime | complete | `2aee33569f0268d7bc0f4f52437dfa0b405432a4`; one Runtime projectile component/workset/simulation/correction owner; 317 Runtime tests, 3,718 App tests / 3 skips, 47 focused Core projectile tests, 8,591 complete Release tests / 5 skips, exact arrow/bolt/spell evidence, lifecycle/reconnect pass, and nine-stop route pass |
-| J5.7 combined cleanup and closeout | pending | no mirrors, no-window parity, teardown, connected and visual gates |
+| J5.7 combined cleanup and closeout | active | no mirrors, one ownership ledger, no-window parity, teardown, connected and visual gates |
 
 ## J5.1 — canonical action state
 
@@ -481,6 +481,12 @@ J5.5 rollback:
 git revert 7e6033d0adcd0b572c20e89dd275746fb442d52f
 ```
 
+J5.6 rollback:
+
+```text
+git revert 2aee33569f0268d7bc0f4f52437dfa0b405432a4
+```
+
 ## Acceptance
 
 J5 is complete only when:

docs/research/2026-07-26-slice-j5-6-projectile-ownership.md

@@ -0,0 +1,169 @@
+# Slice J5.6 — projectile-simulation ownership
+
+Date: 2026-07-26
+Scope: ownership relocation only; no retail algorithm, packet, collision
+policy, impact authority, or presentation change
+
+## Objective
+
+Move the mutable projectile component, projectile workset, prediction version,
+authoritative correction, and retail projectile step into the same
+`AcDream.Runtime` physics lifetime that already owns the canonical entity
+record, body, object clock, collision engine, shadows, and full cell.
+
+App remains responsible for:
+
+- resolving the projectile's immutable Setup/DAT collision sphere;
+- supplying the current graphical projection validity acknowledgement;
+- rebucketing and positioning the retained render projection after a Runtime
+  commit;
+- synchronizing the render shadow and effect pose;
+- drawing meshes, trails, particles, sounds, and impact effects.
+
+ACE remains authoritative for targets, hits, damage, impact scripts, and
+deletion.
+
+## Named-retail oracle
+
+Primary source:
+`docs/research/named-retail/acclient_2013_pseudo_c.txt`.
+
+- `CPhysicsObj::UpdateObjectInternal` `0x005156B0`
+- `CPhysicsObj::update_object` `0x00515D10`
+- `CPhysicsObj::SetPositionInternal(CTransition const*)` `0x00515330`
+- `CPhysicsObj::set_velocity` `0x005113F0`
+- `OBJECTINFO::missile_ignore` `0x0050CEB0`
+- `Frame::set_vector_heading` `0x00535DB0`
+
+The complete translated retail projectile control flow is pinned in
+`docs/research/2026-07-13-retail-projectile-vfx-pseudocode.md`. The existing
+Core `ProjectilePhysicsStepper` and collision driver were cross-checked there
+against ACE's physics implementation and Holtburger/ACViewer's DAT
+interpretation. J5.6 reuses those algorithms unchanged.
+
+## Preserved control flow
+
+```text
+for each spatial projectile owned by the current incarnation:
+    reject static, frozen, parented, hidden, cell-less, or inactive bodies
+    advance the retained CPhysicsObj clock in retail 0.2-second quanta
+    for each due quantum:
+        calculate acceleration from the final PhysicsState
+        clamp speed to 50 world units/second
+        integrate position, velocity, omega, and AlignPath orientation
+        continuously sweep the authored Setup-local collision sphere
+        apply retail missile-ignore and inelastic/elastic collision rules
+        commit the accepted frame and full cell to the canonical record
+        stop the split prediction if any authority/incarnation token changed
+    publish one immutable committed frame to the host
+```
+
+The graphical host may reject the presentation acknowledgement after a
+re-entrant delete, replacement, rebucket, or session reset. That rejection
+invalidates the pending prediction; it cannot roll back or redirect a newer
+canonical owner.
+
+## Previous ownership gap
+
+Before J5.6:
+
+- `RuntimeEntityRecord` owned identity, body, state, clocks, and cell;
+- `RuntimePhysicsState` owned the engine, shadows, remotes, and ordinary/remote
+  worksets;
+- App `ProjectileController` still owned the projectile component, projectile
+  workset snapshot, quantum stepping, correction, and canonical cell commit.
+
+That split made a no-window Runtime unable to fly the same projectile without
+reconstructing App behavior and left projectile mutation on the wrong side of
+the presentation boundary.
+
+## Implemented boundary
+
+- `RuntimeEntityRecord.Projectile` is the sole mutable projectile component
+  slot.
+- `RuntimeProjectile` owns the canonical body, authored collision sphere, and
+  prediction-authority version.
+- `RuntimePhysicsState` owns binding, refresh, spatial membership, authoritative
+  vector/state correction, and the exact-key projectile workset.
+- `RuntimeProjectilePhysicsUpdater` owns the unchanged retail quantum,
+  integration, sweep, collision, cell-crossing, and split-prediction logic.
+- Runtime cell commits flow through the same typed
+  `RuntimePhysicsCellCommit` used by ordinary and remote objects.
+- App `ProjectileController` resolves DAT/Setup shape data, delegates the
+  simulation, and applies only retained render projection, shadow, and effect
+  pose acknowledgements.
+- Delete, GUID reuse, visibility withdrawal, pending-to-loaded recovery,
+  authoritative correction, and session teardown use the canonical Runtime
+  record and workset; they never reconstruct from stale spawn data.
+
+No gameplay outcome moved client-side. No projectile-specific render pass,
+second GUID map, body mirror, effect owner, or collision owner was introduced.
+
+## Automated acceptance
+
+On production commit
+`2aee33569f0268d7bc0f4f52437dfa0b405432a4`:
+
+- Runtime tests: 317 passed.
+- App tests: 3,718 passed / 3 skipped.
+- Focused Core projectile tests: 47 passed.
+- Complete Release solution: 8,591 passed / 5 skipped.
+- Release solution build: zero warnings and zero errors.
+
+The focused fixtures cover:
+
+- canonical component/body/workset identity;
+- 0.2-second catch-up quanta and prediction invalidation;
+- clamp, gravity, omega, full 3-D AlignPath, and collision;
+- thin walls and inelastic stopping;
+- missile/ethereal/designated-target exclusion;
+- loaded, pending, landblock crossing, and hydration;
+- State/Vector/Position correction order;
+- deletion, same-GUID reuse, reset, and 96-owner lifetime stress;
+- no duplicate mesh, body, shadow, script, effect, or projectile owner.
+
+## Connected acceptance
+
+All connected processes used the exact embedded/source commit
+`2aee33569f0268d7bc0f4f52437dfa0b405432a4` and closed gracefully.
+
+- Arrow plus representative spell projectile:
+  `.test-out/j56-projectile-20260726-143256`
+  recorded an authoritative missile attack, live Arrow spawn, live Acid Stream
+  spawn, and matching authoritative deletes.
+- Crossbow bolt:
+  `.test-out/j56-crossbow-evidence-20260726-145612`
+  recorded a missile attack, live Quarrel spawn with Setup `0x0200012A`,
+  authoritative ammo pickup/update, projectile delete, and target death.
+- Lifecycle/reconnect:
+  `logs/connected-world-gate-20260726-145731/report.json`
+  passed capped login plus fresh uncapped reconnect, all seven checkpoints,
+  zero failures, and two code-zero exits.
+- Canonical nine-stop route:
+  `logs/connected-r6-soak-20260726-151349.report.json`
+  materialized all nine destinations, passed the Caul/Holtburg/Caul-return
+  forward, jump, combat, and movement-truth exercises, matched source and
+  binary, and exited with code zero and zero failures.
+
+The first route attempt,
+`logs/connected-r6-soak-20260726-150347.report.json`, intentionally remains in
+the evidence trail. Its strict plateau check saw the already-known late lazy
+mesh population (`582 -> 604`) while sampled entity counts happened to match
+and therefore reported one failure. The immediate warm-machine rerun saw the
+same class of late population (`581 -> 598`) together with one changed visible
+owner and correctly classified it as workload variation. The accepted J5.5
+baseline exhibited the same late Caul behavior (`575 -> 597`), and the J5.6
+diff contains no mesh-cache, mesh-preparation, streaming, or residency change.
+This is not waived as a projectile result and no threshold was loosened.
+
+## Divergence and rollback
+
+J5.6 changes ownership only. The retail algorithm, constants, packet order,
+server authority, and presentation are unchanged, so it introduces no new
+retail-divergence row.
+
+Exact rollback:
+
+```text
+git revert 2aee33569f0268d7bc0f4f52437dfa0b405432a4
+```