Ajoute les extensions et Harmonies : Crescendo

- Format expansions/<bggId>-<nom>/ (expansion.json, rules.fr.json),
  schémas expansion et expansion-rules, guide de contribution
- Harmonies : choix de la face des plateaux personnels (A/B), module
  Esprits de la nature renommé
- Crescendo (472690) : modules Sanctuaires et Murmures, faces C et D,
  fiche de règles résumée

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

games/414317-harmonies/expansions/472690-crescendo/expansion.json

@@ -0,0 +1,38 @@
+{
+  "$schema": "../../../../schemas/expansion.schema.json",
+  "schemaVersion": 1,
+  "bggId": 472690,
+  "name": "Crescendo",
+  "adds": {
+    "options": [
+      { "type": "boolean", "id": "sanctuaires", "label": "Module Sanctuaires", "default": true },
+      { "type": "boolean", "id": "murmures", "label": "Module Murmures", "default": true }
+    ],
+    "choices": [
+      {
+        "optionId": "plateau",
+        "values": [
+          { "value": "C", "label": "Face C (Crescendo)" },
+          { "value": "D", "label": "Face D (Crescendo)" }
+        ]
+      }
+    ],
+    "categories": [
+      {
+        "id": "sanctuaires",
+        "label": "Sanctuaires",
+        "icon": "Castle",
+        "color": "#0e7490",
+        "requiresOption": "sanctuaires",
+        "after": "animaux"
+      },
+      {
+        "id": "murmures",
+        "label": "Murmures",
+        "icon": "Gem",
+        "color": "#a855f7",
+        "requiresOption": "murmures"
+      }
+    ]
+  }
+}