Add named equipment rewards

docs/GODOT_4_6_MIGRATION.md

@@ -46,6 +46,7 @@ powershell -NoProfile -ExecutionPolicy Bypass -File tools\check_godot46_readines
 - Finite-stock Shop entries show remaining counts and disable once sold out.
 - Manual checkpoint save/load restores the expected current briefing without script errors.
 - A player unit can move, attack, wait, use a tactic, use an item, and equip compatible gear; weapon effectiveness appears in forecasts and equipment/shop text when applicable.
+- Named equipment rewards such as Yitian Sword and Dragon Spear validate, appear with a `Named` equipment-menu tag, and remain ordinary stackable inventory stock until unique item instances are implemented.
 - Hovering an occupied tile shows the unit's class, movement type, AGI, movement, range, and equipped weapon/armor/accessory, with empty slots shown as `-`.
 - Movement-triggered supply cache events grant battle inventory items with pickup feedback, and the items persist only after victory.
 - The Threat toggle or `Y` key shows enemy physical and hostile tactic reach, hovered threatened tiles name the threatening units, and occupied player tiles show physical damage/hit estimates plus hostile tactic damage or status hints.