Initial commit — Station 0 vertical slice in progress

Includes full design documentation (ARCHITECTURE, DESIGN_NOTES, CONTENT_SPEC, PRODUCTION_NOTES)
and active Godot 4 / GDScript codebase. Core systems built: player, floor generation,
room system, enemy base, body part upgrades, run manager, save system, HUD, EventBus.

scripts/enemies/enemy_projectile.gd

@@ -0,0 +1,44 @@
+extends Area2D
+
+# ---------------------------------------------------------------------------
+# Shared enemy projectile — used by Repeater (linear) and Anchor (homing)
+# ---------------------------------------------------------------------------
+
+var direction:      Vector2  = Vector2.RIGHT
+var speed:          float    = 200.0
+var damage:         float    = 1.0
+var max_range:      float    = 500.0
+
+# Homing — disabled by default
+var homing:         bool     = false
+var homing_target:  Node2D   = null
+
+const HOMING_STRENGTH := 2.0   # radians/second turn rate
+
+var _distance_traveled: float = 0.0
+
+func _ready() -> void:
+	rotation = direction.angle()
+	body_entered.connect(_on_body_entered)
+
+func _physics_process(delta: float) -> void:
+	if homing and homing_target != null and is_instance_valid(homing_target):
+		var to_target := (homing_target.global_position - global_position).normalized()
+		direction = direction.lerp(to_target, HOMING_STRENGTH * delta).normalized()
+		rotation = direction.angle()
+
+	var move := direction * speed * delta
+	position += move
+	_distance_traveled += move.length()
+	if _distance_traveled >= max_range:
+		queue_free()
+
+func _on_body_entered(body: Node) -> void:
+	if body.is_in_group("player"):
+		body.take_damage(damage)
+		queue_free()
+	elif body is StaticBody2D:
+		queue_free()
+
+func _draw() -> void:
+	draw_circle(Vector2.ZERO, 4.0, Color(1.0, 0.4, 0.1))