feat(R3-W6): LOCAL PLAYER UNIFICATION — edge-driven retail input; UpdatePlayerAnimation + the synthesis layer DELETED (closes J15)

The local player now drives the SAME pipeline remotes use. The
controller's per-frame RawMotionState rebuild (level-triggered D6.2) is
replaced by retail's CommandInterpreter altitude: key EDGES fire
DoMotion/StopMotion (0x00528d20/0x00528530) and the Shift edge fires
set_hold_run (0x00528b70, caller-0x006b33ca shape) — the interpreter's
own RawState mutates via ApplyMotion/RemoveMotion and every dispatch
routes the funnel + DefaultSink into the sequencer. GameWindow's
UpdatePlayerAnimation (169 lines) is DELETED with both
LocalAnimationCommand/LocalAnimationSpeed MovementResult fields and all
three synthesis sites (K-fix5 pacing, Walk→Run cycle selection, the
auto-walk overrides): run pacing now comes from apply_run_to_command's
my_run_rate promotion — the same source remotes use; airborne-Falling
falls out of contact_allows_move (the funnel's second dispatch).
Auto-walk's #69 turn-phase legs re-expressed as DoMotion(Turn*) edges;
teleport idle = StopCompletely (retail's full stop) + an edge-tracker
reset so held keys walk straight out of a portal.

Map discovery R1 fixed: ChargeJump() now fires at charge START (the
0x0056afac input-boundary site) — StandingLongJump had NEVER armed in
production despite the W3 port.

TWO root-cause fixes the cutover surfaced (each would have been
invisible under the old synthesis layer):
- CurrentHoldKey was a shadow FIELD synced only on the raw dispatch
  branch; set_hold_run writes RawState.CurrentHoldKey, so an edge-driven
  Shift toggle followed by DoMotion read a stale None and lost the run
  promotion. Now an alias of RawState.CurrentHoldKey (retail's
  adjust_motion reads raw_state.current_holdkey directly).
- The controller's grounded velocity + jump-launch writes used
  set_local_velocity's default autonomous:false, silently clearing
  LastMoveWasAutonomous and flipping the A3 dual dispatch to the
  interpreted branch for the local player. Both marked autonomous.

EXPECTED-DIFFS (map §6, for the R3 visual pass): #45's 1.248x sidestep
factor + ACDREAM_ANIM_SPEED_SCALE died with UpdatePlayerAnimation —
local sidestep pacing now matches how remotes have always played;
auto-walk-at-run plays walk-pace legs until R4; ApplyServerRunRate's
apply_current_movement goes live (Branch-2 fast re-speed absorbs the
echo — retail's own mid-run speed-change mechanism).

Wire: outbound values stay input-derived (the L.2b-verified byte
stream untouched; RawState-sourcing needs the map §2b cdb TODO and R7
owns outbound). MotionStateChanged = the old comparison minus the dead
localAnimCmd leg, OR any edge fired.

Full suite green: 3,731 passed. Live smoke: in-world, user-driven
input through the new path (walk/turn/strafe), 12k entities, zero
exceptions.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/AcDream.Core/Physics/MotionInterpreter.cs

@@ -587,12 +587,15 @@ public sealed class MotionInterpreter : IMotionDoneSink
     /// <summary>
     /// The physics object's currently-held movement key (retail
     /// <c>this->raw_state.current_holdkey</c>). <see cref="adjust_motion"/>
-    /// falls back to this field when the per-channel holdKey argument passed
-    /// in is <see cref="HoldKey.Invalid"/>. D6.2 (the raw-state orchestrator)
-    /// is responsible for keeping this in sync with the raw motion state;
-    /// default <see cref="HoldKey.None"/> is a safe no-op until then.
+    /// falls back to this property when the per-channel holdKey argument
+    /// passed in is <see cref="HoldKey.Invalid"/>. R3-W6: an ALIAS of
+    /// <see cref="RawMotionState.CurrentHoldKey"/> — retail's adjust_motion
+    /// reads <c>raw_state.current_holdkey</c> directly; the former shadow
+    /// field only synced on the raw dispatch branch, so an edge-driven
+    /// set_hold_run followed by DoMotion read a stale None and lost the
+    /// run promotion (the W6 cutover surfaced this).
     /// </summary>
-    public HoldKey CurrentHoldKey = HoldKey.None;
+    public HoldKey CurrentHoldKey => RawState.CurrentHoldKey;
 
     /// <summary>True when crouching-in-place for a standing long jump (offset +0x70).</summary>
     public bool StandingLongJump;
@@ -1345,7 +1348,10 @@ public sealed class MotionInterpreter : IMotionDoneSink
     /// </summary>
     public void apply_raw_movement(RawMotionState raw)
     {
-        CurrentHoldKey = raw.CurrentHoldKey;
+        // R3-W6: CurrentHoldKey is now an alias of RawState.CurrentHoldKey;
+        // keep the interpreter's raw state authoritative when a snapshot
+        // arrives through this legacy overload.
+        RawState.CurrentHoldKey = raw.CurrentHoldKey;
 
         // Copy raw -> interpreted. Retail copies 7 fields; our
         // InterpretedMotionState omits current_style (velocity doesn't use it).