fix(combat): apply server attack motions locally

Route accepted non-autonomous local UpdateMotion state through retail's wholesale interpreted-motion funnel, so ACE-selected melee and missile actions use the normal motion queue and action-stamp gate. Share nullable wire conversion with remotes and remove the local direct command replay.

Co-Authored-By: Codex <codex@openai.com>

docs/research/2026-07-11-local-combat-motion-pseudocode.md

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+# Local combat UpdateMotion — retail receive pseudocode
+
+Date: 2026-07-11
+
+## Question
+
+Who chooses and plays the local player's melee or missile attack motion?
+
+## Named-retail oracle
+
+- `ClientCombatSystem::ExecuteAttack` at `0x0056BB70` sends the targeted
+  melee/missile request and updates combat-repeat state. It does not choose a
+  concrete swing command and does not play an animation locally.
+- `CPhysics::SetObjectMovement` at `0x00509690` rejects a local autonomous
+  echo, but accepts a newer non-autonomous movement event, stores
+  `last_move_was_autonomous = false`, calls `unpack_movement`, then returns 1
+  so `CommandInterpreter::LoseControlToServer` runs.
+- `MovementManager::unpack_movement` at `0x00524440`, case 0, unpacks an
+  `InterpretedMotionState`, calls `move_to_interpreted_state`, then applies the
+  sticky-object and standing-long-jump trailers.
+- `CMotionInterp::move_to_interpreted_state` at `0x005289C0` copies the state
+  wholesale, reapplies style/forward/side/turn, and dispatches fresh command
+  list entries under the 15-bit `server_action_stamp` gate. The player skips
+  only command entries whose autonomous bit is set.
+
+## ACE cross-reference
+
+ACE's `Player_Melee.DoSwingMotion` selects the actual maneuver from the combat
+table, constructs a `Motion`, marks the target sticky, and broadcasts it.
+Missile attacks similarly enqueue the server-selected aim action, followed by
+reload and Ready. `MovementData.IsAutonomous` documents the wire split as
+client-initiated `true`, server-initiated `false`.
+
+## Retail pseudocode
+
+```text
+on local attack input:
+    send TargetedMeleeAttack or TargetedMissileAttack
+    do not invent or play a swing locally
+
+on UpdateMotion for local player:
+    apply movement and server-control sequence gates
+    if event.isAutonomous:
+        drop the entire event
+
+    player.lastMoveWasAutonomous = false
+    interrupt current move
+    unstick
+    apply outer style if it changed
+
+    if movementType is MoveTo/TurnTo:
+        route to MoveToManager
+        return
+
+    if movementType == InterpretedMotionState:
+        ims = constructor defaults (NonCombat, Ready, speeds 1)
+        unpack every present field over ims
+        move_to_interpreted_state(ims)
+            copy every axis wholesale
+            apply style, forward, sidestep, turn
+            for each fresh command-list entry:
+                if local player and entry.autonomous: skip
+                dispatch entry through the motion table
+        apply sticky target trailer
+        write standingLongJump, including false
+
+    command interpreter loses control to server
+    next local input edge takes autonomous control back
+```
+
+## acdream correction
+
+The local branch already had the autonomous-event rejection and the
+interrupt/style/MoveTo routing, but deliberately skipped the mt-0 wholesale
+copy. It then replayed `Commands[]` directly through
+`AnimationCommandRouter`, bypassing retail's action-stamp and local-autonomous
+gates. The correction routes local mt-0 through the existing
+`MotionInterpreter.MoveToInterpretedState` and persistent motion-table sink,
+exactly like remotes, and removes the direct replay. A shared App-layer factory
+now owns nullable-wire-to-constructor-default conversion for both branches.
+