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/currency_orb.gd

@@ -0,0 +1,17 @@
+extends Area2D
+
+var value: int = 1
+
+func _ready() -> void:
+	body_entered.connect(_on_body_entered)
+
+# Placeholder visual — gold circle
+func _draw() -> void:
+	draw_circle(Vector2.ZERO, 5.0, Color(1.0, 0.8, 0.1))
+	draw_arc(Vector2.ZERO, 5.0, 0, TAU, 16, Color(1.0, 1.0, 0.4), 1.0)
+
+func _on_body_entered(body: Node) -> void:
+	if body.is_in_group("player"):
+		UpgradeManager.hub_credits += value
+		EventBus.credits_changed.emit(UpgradeManager.hub_credits)
+		queue_free()