Add pirate class and separation config

src/pirate-ai.js

@@ -0,0 +1,76 @@
+export const PIRATE_CLASSES = {
+  raider: {
+    key: 'raider',
+    label: 'RAIDER',
+    hull: 80,
+    speed: 148,
+    turnRate: 70,
+    reloadMs: 1280,
+    damage: 4,
+    preferredRange: 300,
+    retreatRange: 175,
+    broadsideRange: 380,
+    broadsideError: 34,
+    displaySize: 70,
+  },
+  frigate: {
+    key: 'frigate',
+    label: 'FRIGATE',
+    hull: 120,
+    speed: 118,
+    turnRate: 52,
+    reloadMs: 1650,
+    damage: 6,
+    preferredRange: 335,
+    retreatRange: 210,
+    broadsideRange: 420,
+    broadsideError: 38,
+    displaySize: 78,
+  },
+  captain: {
+    key: 'captain',
+    label: 'CAPTAIN',
+    hull: 180,
+    speed: 102,
+    turnRate: 44,
+    reloadMs: 1450,
+    damage: 8,
+    preferredRange: 365,
+    retreatRange: 225,
+    broadsideRange: 470,
+    broadsideError: 32,
+    displaySize: 88,
+  },
+};
+
+export const pirateClassForWave = (wave, index, count) => {
+  if (wave >= 4 && wave % 2 === 0 && index === count - 1) return PIRATE_CLASSES.captain;
+  if (wave >= 2 && (wave + index) % 3 === 0) return PIRATE_CLASSES.raider;
+  return PIRATE_CLASSES.frigate;
+};
+
+export const separationVector = (ship, ships, radius = 125) => {
+  let x = 0;
+  let y = 0;
+
+  for (const other of ships) {
+    if (!other || other === ship || !other.active) continue;
+
+    const dx = other.x - ship.x;
+    const dy = other.y - ship.y;
+    const distance = Math.hypot(dx, dy);
+    if (distance <= 0 || distance >= radius) continue;
+
+    const strength = (radius - distance) / radius;
+    x -= (dx / distance) * strength;
+    y -= (dy / distance) * strength;
+  }
+
+  const magnitude = Math.hypot(x, y);
+  if (magnitude > 1) {
+    x /= magnitude;
+    y /= magnitude;
+  }
+
+  return { x, y };
+};