docs: enrich docs/specs and remove placeholders

**Motivations:**
- Make docs/specs implementation-ready without empty sections or placeholders.

**Root causes:**
- Multiple specs still contained non-actionable placeholders (N/A, “see above”, "..."), and inconsistent “no cache” wording.

**Correctifs:**
- Replace placeholders with explicit tables, structures, and typed examples.
- Align “no cache / no memorization” statements where relevant.

**Evolutions:**
- Add a features doc entry to track the documentation enrichment effort.

**Pages affectées:**
- docs/specs/*
- docs/features/docs-specs-enrichment.md
- docs/leo.md
- docs/plan-enrich-docs-specs.md

docs/specs/carte_zoo.md

@@ -39,7 +39,33 @@ La carte du zoo est l'espace principal de gestion du joueur où il place ses bâ
   "owner_id": "uuid",
   "width": "integer (init 5)",
   "height": "integer (init 6)",
-  "cases": [ ... ]
+  "cases": [
+    {
+      "id": "uuid",
+      "grid": { "x": "integer", "y": "integer" },
+      "iso": { "iso_x": "integer", "iso_y": "integer" },
+      "z_index": "integer",
+      "biome": "enum('prairie','ocean','montagne')",
+      "terrain": {
+        "ground_type": "enum('herbe','terre','sable','roche','eau')",
+        "path_type": "enum('none','terre','gravier','paves','bois_pont')",
+        "decoration_ids": "uuid[]"
+      },
+      "occupancy": {
+        "type": "enum('empty','animal','building','service','enclosure_fence','water_obstacle')",
+        "entity_id": "uuid | null"
+      },
+      "render": {
+        "tile_variant": "string (auto-tiling key)",
+        "occluder": "boolean",
+        "click_hitbox": "enum('tile','base_sprite','custom_polygon')"
+      },
+      "timestamps": {
+        "created_at": "timestamp",
+        "updated_at": "timestamp"
+      }
+    }
+  ]
 }
 ```