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.

data/run_items/overclock_chip.tres

@@ -0,0 +1,11 @@
+[gd_resource type="Resource" script_class="RunItem" load_steps=2 format=3]
+
+[ext_resource type="Script" path="res://scripts/items/run_item.gd" id="1"]
+
+[resource]
+script = ExtResource("1")
+display_name = "Overclock Chip"
+description = "+1.0 fire rate"
+effect = 0
+stat_key = "fire_rate"
+stat_delta = 1.0

data/run_items/plating_shard.tres

@@ -0,0 +1,12 @@
+[gd_resource type="Resource" script_class="RunItem" load_steps=2 format=3]
+
+[ext_resource type="Script" path="res://scripts/items/run_item.gd" id="1"]
+
+[resource]
+script = ExtResource("1")
+display_name = "Plating Shard"
+description = "+2 max health, restore 2 HP"
+effect = 0
+stat_key = "max_health"
+stat_delta = 2.0
+heal_on_pickup = 2.0

data/run_items/range_booster.tres

@@ -0,0 +1,11 @@
+[gd_resource type="Resource" script_class="RunItem" load_steps=2 format=3]
+
+[ext_resource type="Script" path="res://scripts/items/run_item.gd" id="1"]
+
+[resource]
+script = ExtResource("1")
+display_name = "Range Booster"
+description = "+200 projectile range"
+effect = 0
+stat_key = "range"
+stat_delta = 200.0

data/run_items/ricochet_module.tres

@@ -0,0 +1,9 @@
+[gd_resource type="Resource" script_class="RunItem" load_steps=2 format=3]
+
+[ext_resource type="Script" path="res://scripts/items/run_item.gd" id="1"]
+
+[resource]
+script = ExtResource("1")
+display_name = "Ricochet Module"
+description = "Projectiles bounce off walls once"
+effect = 1

data/run_items/scatter_core.tres

@@ -0,0 +1,11 @@
+[gd_resource type="Resource" script_class="RunItem" load_steps=2 format=3]
+
+[ext_resource type="Script" path="res://scripts/items/run_item.gd" id="1"]
+
+[resource]
+script = ExtResource("1")
+display_name = "Scatter Core"
+description = "Fire 3 projectiles in a spread"
+effect = 2
+scatter_count = 3
+scatter_spread_deg = 20.0

data/run_items/volatile_round.tres

@@ -0,0 +1,11 @@
+[gd_resource type="Resource" script_class="RunItem" load_steps=2 format=3]
+
+[ext_resource type="Script" path="res://scripts/items/run_item.gd" id="1"]
+
+[resource]
+script = ExtResource("1")
+display_name = "Volatile Round"
+description = "Projectiles explode on hit"
+effect = 3
+explosion_radius = 64.0
+explosion_damage = 2.5