feat(#46 PR 2): per-region stat lever (regionChanges) + region-stat hover

v0.29.0 — the LLM can now target individual regions' stats via
TurnResult.regionChanges (set/add per stat, clamped 0-100), applied
after nation-wide stateChanges and before the weighted-median
recompute. The map hover tooltip shows each region's own four stats.
The stub stays deterministic (regionChanges: []).

Fixes #46 (PR 2 of 2)

package.json

@@ -1,6 +1,6 @@
 {
   "name": "history",
-  "version": "0.28.0",
+  "version": "0.29.0",
   "private": true,
   "type": "module",
   "description": "AI-driven alternate-history simulator — the LLM is the world engine (Pax Historia style).",