fix(spells): set the correct area shapes

SRD-verified area templates: Burning Hands 15-ft cone, Color Spray 15-ft cone, Fear 30-ft cone, Flurry of Snowballs 30-ft cone, Lightning Bolt 120-ft line (all converted from single-target/burst approximations to proper AreaEffect shapes); Fireball 20-ft burst, Sound Burst 10-ft spread, Sleep 10-ft burst, Web 20-ft spread kept. Close-range spells note the 15/30-ft RAW ranges as an approximation in their descriptions. README: cone/scaling limitations moved out of the limitations list, new area-shape + caster-level scaling rules documented, areas.py added to the architecture.

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

data/spells/burning_hands.json

@@ -2,18 +2,26 @@
   "name": "Burning Hands",
   "level": 1,
   "school": "evocation",
-  "range": "touch",
+  "range": "close",
   "save": "ref",
   "base_dc": 10,
   "cast_time": "standard",
   "effects": [
     {
-      "type": "damage",
-      "formula": "0",
-      "types": ["fire"],
-      "half_on_save": true,
-      "scaling": { "dice": "1d4", "per_levels": 1, "max_dice": 5 }
+      "type": "area",
+      "shape": "cone",
+      "radius_ft": 15,
+      "save_for_half": true,
+      "effects": [
+        {
+          "type": "damage",
+          "formula": "0",
+          "types": ["fire"],
+          "half_on_save": true,
+          "scaling": { "dice": "1d4", "per_levels": 1, "max_dice": 5 }
+        }
+      ]
     }
   ],
-  "description": "SRD spells/burning-hands.md: 1d4 points of fire damage per caster level (maximum 5d4) in a 15-ft. cone; Reflex half. The cone template is applied in the area-shapes batch; until then the spell resolves on the target."
+  "description": "SRD spells/burning-hands.md: a 15-ft. cone of searing flame dealing 1d4 points of fire damage per caster level (maximum 5d4); Reflex half. The SRD range is 15 ft. - modeled as the closest category (close, 25 ft. at low levels)."
 }