fix: runtime-load actor sprites (was preload) — stale import cache no longer breaks scripts

A stale/incomplete Godot import cache made preload() of the sprite
textures fail at COMPILE time, killing the actor scripts entirely —
no movement, no draw, near-black screen (reported on the Mac editor
after pull). Switching preload -> runtime load() degrades a missing
texture to an invisible sprite instead of a dead script; movement and
logic always survive. Committed state was verified sound via fresh
clone (imports + main scene + smoke all clean); this hardens against
the cross-machine cache-lag failure mode. Smoke 3/3 green.

scripts/kinetic_projectile.gd

@@ -9,16 +9,15 @@ extends Area2D
 @export var knockback := 220.0
 @export var lifetime := 0.8
 
-const SPRITE := preload("res://assets/sprites_ph/slug_ph.png")
-
 var direction := Vector2.RIGHT
 
 
 func _ready() -> void:
 	add_to_group("projectiles")
 	rotation = direction.angle()
+	# Runtime load, not preload — resilient to a stale import cache.
 	var spr := Sprite2D.new()
-	spr.texture = SPRITE
+	spr.texture = load("res://assets/sprites_ph/slug_ph.png")
 	add_child(spr)
 	body_entered.connect(_on_body_entered)
 

scripts/mech.gd

@@ -16,14 +16,14 @@ var hull: float
 var _dash := Vector2.ZERO
 
 
-const SPRITE := preload("res://assets/sprites_ph/m03_ph.png")
-
-
 func _ready() -> void:
 	add_to_group("mech")
 	hull = hull_max
+	# Runtime load (not preload): a stale/incomplete import cache must
+	# degrade to an invisible sprite, never a script-compile failure
+	# that would kill movement too.
 	var spr := Sprite2D.new()
-	spr.texture = SPRITE
+	spr.texture = load("res://assets/sprites_ph/m03_ph.png")
 	add_child(spr)
 
 

scripts/salvage.gd

@@ -4,8 +4,6 @@ extends Area2D
 ## levels). Drifts to the mech inside the magnet radius, collected on
 ## contact, fades out if ignored. Constructed in code, no scene.
 
-const SPRITE := preload("res://assets/sprites_ph/scrap_ph.png")
-
 var value := 1
 var magnet_radius := 70.0
 var drift_speed := 150.0
@@ -25,8 +23,9 @@ func _ready() -> void:
 	sh.radius = 6.0
 	cs.shape = sh
 	add_child(cs)
+	# Runtime load, not preload — resilient to a stale import cache.
 	_sprite = Sprite2D.new()
-	_sprite.texture = SPRITE
+	_sprite.texture = load("res://assets/sprites_ph/scrap_ph.png")
 	add_child(_sprite)
 	body_entered.connect(_on_body_entered)