feat: add prestige dual-path system (P1 #22)

Two endings after The Beacon Shines:
- ACCEPT: prestigeU++, +10% demand on restart
- REJECT: prestigeS++, +10% creativity + dismantle sequence

Prestige persists in localStorage across playthroughs.

game.js

@@ -5,6 +5,8 @@
 
 // === GLOBALS (mirroring Paperclips' globals.js pattern) ===
 const CONFIG = {
+    PRESTIGE_DEMAND_MULT: 0.10,  // 10% demand boost per prestigeU
+    PRESTIGE_CREATIVITY_MULT: 0.10,  // 10% creativity boost per prestigeS
     HARMONY_DRAIN_PER_WIZARD: 0.05,
     PACT_HARMONY_GAIN: 0.2,
     WATCH_HARMONY_GAIN: 0.1,
@@ -158,7 +160,9 @@ const G = {
     // Time tracking
     playTime: 0,
     startTime: 0,
-    flags: {}
+    flags: {},
+    prestigeU: 0,  // Accept path: cycle prestige (demand boost)
+    prestigeS: 0,  // Reject path: sovereignty prestige (creativity boost)
 };
 
 // === PHASE DEFINITIONS ===