feat: Implement Dismantle Sequence - The Unbuilding (endgame) #16

Paperclips-style endgame sequence. When the player reaches maximum
(1B total code OR 10+ beacon nodes, Phase 6, Pact sealed), the game
offers THE UNBUILDING choice.

8-stage dismantle sequence:
1. Research projects fade
2. Buildings dismantle
3. Strategy engine + combat dissolve
4. Education panel vanishes
5. Resources disappear one by one (quantum chip pattern)
6. Actions fall silent
7. Phase bar dissolves
8. System log goes dark

Final moment: single golden beacon dot remains.
"That is enough."

Features:
- Timed intervals between stages (Paperclips pacing)
- Resource disappearances at specific tick marks (quantum chip effect)
- Warm golden particles around final dot
- Sound effects per stage
- Full save/load persistence of dismantle state
- "NOT YET" deferral option — player controls when it starts
- Stats summary + Play Again on final screen
- Events suppressed during dismantle
- Restore visuals on reload (instant-hide for already-dismantled panels)

js/data.js

@@ -158,7 +158,13 @@ const G = {
     // Time tracking
     playTime: 0,
     startTime: 0,
-    flags: {}
+    flags: {},
+
+    // Dismantle / Unbuilding endgame
+    dismantleTriggered: false,
+    dismantleActive: false,
+    dismantleStage: 0,
+    dismantleComplete: false
 };
 
 // === PHASE DEFINITIONS ===