NEON-29: Suspend ledge peel on column treads to stop idle jitter.

When vertical route is latched and nav column steering is active, peel
plus zero floor snap caused a 3-frame limit cycle (NEON-16 traces).
Skip peel and restore normal snap while feet are within 0.48 m of the
goal surface vertically.

client/scripts/player.gd

@@ -28,6 +28,10 @@ const NAV_COLUMN_STEER_EXIT_DIST: float = 0.97
 const NAV_PATH_STEER_MIN_LOOKAHEAD: float = 0.22
 ## If lookahead steering points more than ~105° from the click direction (XZ), use direct goal steer instead.
 const NAV_PATH_STEER_MIN_GOAL_DOT: float = -0.25
+## While [code]vlat && ncol[/code], ledge peel + zero floor snap fight [method move_and_slide] on approach treads
+## (3-cycle NEON-16 traces: same XZ triplet, Y/feet_y ping-pong). Suspend peel and allow normal snap when the
+## feet are within this vertical distance of the goal **surface** (m).
+const WALK_PEEL_SUSPEND_VERT_SEP: float = 0.48
 ## Hysteresis for [code]needs_vertical_routing[/code]: [code]feet_y[/code] wobbles with
 ## [code]move_and_slide[/code] on treads (~7 cm), so a single margin (see [member DESCEND_GOAL_Y_MARGIN])
 ## can flip path vs direct steering every tick → velocity sign ping-pong while [code]has_goal[/code].
@@ -462,6 +466,14 @@ func _apply_walk_air_gravity(delta: float, _feet_y: float, _move_dir_xz: Vector2
 		velocity += _player_vertical_accel(delta) * delta
 
 
+func _walk_peel_suspend_on_column_treads(feet_y: float) -> bool:
+	return (
+		_walk_vert_route_latched
+		and _walk_nav_column_steering
+		and absf(_auth_walk_goal.y - feet_y) < WALK_PEEL_SUSPEND_VERT_SEP
+	)
+
+
 ## After [method move_and_slide], peel the capsule down when the authoritative goal is below the feet
 ## but the engine still reports floor contact (GROUNDED mode ate negative [code]velocity.y[/code]).
 ## Uses a small accumulated peel speed so displacement matches [code]∫ g dt[/code], not [code]g Δt[/code] (wrong units).
@@ -483,6 +495,9 @@ func _apply_walk_post_slide_ledge_peel(
 	if _auth_walk_goal.y > feet_y + 0.04:
 		_walk_ledge_peel_vy = 0.0
 		return
+	if _walk_peel_suspend_on_column_treads(feet_y):
+		_walk_ledge_peel_vy = 0.0
+		return
 	var peel: bool = (
 		feet_y > _auth_walk_goal.y + WALK_DEEP_DESCENT_FEET_ABOVE_GOAL
 		or not _walk_has_close_floor_probe_below(move_dir_xz)
@@ -506,6 +521,7 @@ func _walk_floor_snap_length(
 		# Strong moving snap + lip [code]is_on_floor()[/code] otherwise cancels gravity every tick.
 		if (
 			is_on_floor()
+			and not _walk_peel_suspend_on_column_treads(feet_y)
 			and (
 				not _walk_has_close_floor_probe_below(move_dir_xz)
 				or feet_y > _auth_walk_goal.y + WALK_DEEP_DESCENT_FEET_ABOVE_GOAL