P14-02: Add buildable Mana warp (A07)

2x2 FRONT warp at 3000G/30 materials/360 min, 15G/day and 1 Mana upkeep.
Every completed warp pair is linked by one path connector, so crossing is a
single step; a 3-Mana fare per rider is charged once in the step's tick.
Warps close while either end is unpowered, the reserve is empty or below one
fare, and blocked arrivals offer no step. Saves validate the derived links.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

scripts/data/facility_catalog.gd

@@ -59,11 +59,13 @@ const RESCUE_FACILITY_PATHS: Array[String] = ["res://data/facilities/rescue/infi
 const INFRASTRUCTURE_FACILITY_IDS: Array[StringName] = [
 	&"guest_stairs",
 	&"service_stairs",
+	&"mana_warp",
 ]
 
 const INFRASTRUCTURE_FACILITY_PATHS: Array[String] = [
 	"res://data/facilities/infrastructure/guest_stairs.tres",
 	"res://data/facilities/infrastructure/service_stairs.tres",
+	"res://data/facilities/infrastructure/mana_warp.tres",
 ]
 
 ## Optional post-MVP expansion definitions. They live below a subdirectory so