Add lore archive system and rebalance pirate HP scaling

Boss defeats at zones 10/20/30 now pause the game and reveal a
one-time Data Archive story entry. Also lower per-zone pirate HP
growth from 1.4x to 1.2x.

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

src/game/types.ts

@@ -77,6 +77,12 @@ export interface FloatingText {
   color: string;
 }
 
+export interface LoreEntry {
+  zone: number;
+  title: string;
+  text: string;
+}
+
 export interface GameSnapshot {
   score: number;
   zone: number;
@@ -96,4 +102,6 @@ export interface GameSnapshot {
   canPrestige: boolean;
   prestigeGain: number;
   cutsceneActive: boolean;
+  loreActive: boolean;
+  loreEntry: LoreEntry | null;
 }