Wire in real ship art for the 3 chosen races

Crop the uploaded terran/mech/vorg concept sheets into 15 individual
transparent PNGs (5 ships per race) using a background-removal pass
tuned to preserve translucent detail (e.g. vorg wing membranes) while
still cutting out the baked-in checkerboard backdrop. Keep each raw
sheet under a source/ subfolder for reference.

Give team_select.gd a per-race ship roster (Interceptor/Gunship/
Bomber/Support/Heavy) instead of one shared ship list, using real
names/roles from racesclasses.md for Terran and Vorg and new
placeholder names for Mechanos (undocumented there). Update race
names/colors to match. Point ship.tscn's default sprite at the new
Terran art now that example_ships is gone.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

CLAUDE.md

@@ -20,10 +20,10 @@
 2. **Main menu** — CASUAL / RANKED (disabled) buttons, callsign input, rank badge, QUIT; clears player state on load
 3. **In-game pause menu** — ESC / controller Start button toggles overlay; game keeps running; RESUME, SETTINGS (stub), SELECT TEAM (stub), QUIT TO MENU, QUIT TO DESKTOP
 4. **Team & ship selection** — shows on world load before player spawns; 2 races randomly offered per match; ship grid with sprites; player spawns with chosen ship after selection
+5. **Real race art wired in** — Terran Republic, Mechanos Sovereignty, and Vorg Swarm each have their own 5-ship roster (Interceptor/Gunship/Bomber/Support/Heavy) with real sprites cropped from uploaded concept sheets (`assets/images/ships/<race>/`); placeholder `example_ships` removed
 
 ## Current Tasks
 
-- [ ] Replace placeholder race names + ship sprites with the 3 chosen races (see `racesclasses.md`)
 - [ ] Asteroids and environment hazards
 - [ ] Bot fill for casual (minimum 7v7, bots fill empty slots — see `bots.md`)
 - [ ] Sound effects (thrust, shoot, explosion, UI)