- New `combat.html` + `/combat` dev-server route + `index.html?combat`
boot a fixed arena where the player ship fights a pack of enemy craft;
all tuning lives in `data/combat.json` (thrust, hulls, shields, lance,
rams, respawns).
- Add `js/combat/` modules: CombatScene, EnemyShip (standoff-ring AI +
lance), Bullet, Fx, StarDrift, and pure rules in Combat.js (armor
damage, orbit step) exercised by the new `dev/combat.test.mjs`.
- Extract shared `awaitFonts` into `js/utils/Fonts.js` so both the game
and sandbox boots use one copy.
- Preload the enemy spritesheet in GameScene so the texture is ready when
combat ships in; add `ships-enemy.png` (+ `.psd`) art.
- Expose `window.__COMBAT__` (reset, spawnEnemy, player, kills) for
devtools tuning; R resets the range, P freezes it.
