Add knight health, boss attack patterns, chases, and music

Knight now has a hit-bar (pirates deal 1, bosses deal 3 damage) with
a new vitality upgrade. Bosses grow bigger/scarier and cycle through
melee/missile/bomb/laser attack patterns; boss HP is now exactly 3x
the local pirate's. Zones 20 and 40 replace their boss with a unique
chase (Pirate Cruiser laser dodge + fuel cell collection; Black Swarm
plasma dodge with a tap-to-escape engulf event). Pirates spawn 5x
faster and got a bandana/eyepatch redesign. Added a procedural music
engine, a visible destination galaxy in the supernova cutscene, and
expanded the Data Archive lore to trigger at zones 10/20/40/60/80/100.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01D5SuZW1XGCkahPX7cHMoRP

src/game/types.ts

@@ -1,4 +1,6 @@
-export type UpgradeKey = 'crystal' | 'speed' | 'damage' | 'droid';
+export type UpgradeKey = 'crystal' | 'speed' | 'damage' | 'droid' | 'vitality';
+
+export type BossType = 'melee' | 'missile' | 'bomb' | 'laser';
 
 export interface CrystalEntity {
   id: number;
@@ -56,6 +58,45 @@ export interface GoldenAsteroidEntity {
   jitter: number[];
 }
 
+export interface BossProjectile {
+  id: number;
+  x: number;
+  y: number;
+  vx: number;
+  vy: number;
+  radius: number;
+}
+
+export interface BossBomb {
+  x: number;
+  y: number;
+  radius: number;
+  state: 'telegraph' | 'boom';
+  timer: number;
+}
+
+export type ChaseKind = 'cruiser' | 'swarm';
+
+export interface FuelCellEntity {
+  id: number;
+  x: number;
+  y: number;
+  radius: number;
+  rotation: number;
+  spin: number;
+  jitter: number[];
+}
+
+export interface ChaseProjectile {
+  id: number;
+  kind: 'laser' | 'plasma';
+  x: number;
+  y: number;
+  vx: number;
+  vy: number;
+  radius: number;
+}
+
 export interface Particle {
   x: number;
   y: number;
@@ -104,4 +145,14 @@ export interface GameSnapshot {
   cutsceneActive: boolean;
   loreActive: boolean;
   loreEntry: LoreEntry | null;
+  knightHp: number;
+  knightMaxHp: number;
+  musicMuted: boolean;
+  chaseActive: boolean;
+  chaseKind: ChaseKind | null;
+  chaseFuelCells: number;
+  chaseFuelRequired: number;
+  chaseTimeRemaining: number;
+  chaseEngulfed: boolean;
+  chaseEscapeMeter: number;
 }