Bullet Girl: Zombie Defense — v2.2.0 "Upgrades & Comms" Update

NEW: Character Upgrade System
- All 12 characters can now be permanently upgraded with gold in the Shop's new "Upgrades" tab.
- Each character has 2–3 upgrade tracks (weapon, HP, and a signature-skill track), 5 levels each.
- Upgrades apply everywhere: story stages, Hard mode, Endless, Survival and Custom Battle.
- Unlocked characters only; the Team Select panel now shows your upgraded stats and skill numbers.

NEW: Communications Officer Claire
- A new comms officer briefs you on the war room screen: a stage briefing when you hover each stage, Hard-mode warnings, opening transmissions in Endless and Survival, and a word from HQ when you win or lose.

IMPROVED
- Unit layering rebuilt: allies, enemies and bosses are now drawn by foot position, so characters no longer overlap the wrong way; attack, walk and death poses stay grounded; afterimages follow the corrected pose.
- The Jumper's idle pose is now the same size as its other poses.
- Character descriptions now reflect your actual upgraded numbers.