feat(client): D-252 view/movement split — body from leg velocity, view is the mouse (T-1093)

D-252 (new record, amends D-054/D-249, resolves Q-084's walk-vs-aim split):
Facing is view-only; movement no longer writes it. Client side: the rig's
moving-body yaw now always derives from leg velocity (the wire octant is the
VIEW and must never rotate the body — the follow-only commit flag
generalizes and disappears); the layered head/torso look-at runs during any
movement, WASD included; the ~100ms post-step re-assert mitigation is
removed as dead (server-side facing_from_delta removal lands separately).

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

client/scripts/autoloads/input_mapper.gd

@@ -208,26 +208,6 @@ func queue_move_step(tile_delta: Vector2i) -> bool:
 # so no throttle — the server's handle_toggle_stance has no cooldown, so the sandbox
 # follower can burst the exact ladder distance and trust it (server validates). No-op
 # while input is suppressed (dialogue / free camera), matching movement.
-## T-1088 follow-facing: unconditionally re-send the CURRENT facing octant.
-## The server overwrites Facing from the move delta on every accepted step
-## (movement.rs facing_from_delta), and the change-gated send above never
-## re-asserts an unchanged octant — during a path-follow the vision cone would
-## stick path-forward until the mouse crossed an octant boundary. The follower
-## calls this ~2 server ticks after each emitted step (same-tick re-asserts
-## lose: movement wins within a tick). Suppression-guarded like all sends.
-func reassert_facing() -> void:
-	if GameState.dialogue_active or GameState.free_camera_mode:
-		return
-	_last_sent_octant = facing_octant
-	input_queue.append(
-		{
-			"action": Action.SET_FACING,
-			"timestamp_msec": Time.get_ticks_msec(),
-			"action_data": {"facing": facing_octant},
-		}
-	)
-
-
 func queue_stance_toggle(up: bool) -> void:
 	if GameState.dialogue_active or GameState.free_camera_mode:
 		return