feat: deepen skill test coverage — 52 → 247 cases across all 43 skills

Add 195 new test cases covering examples from SKILL.md, edge cases,
and parameter combinations. Create _skill.json for form-edit, skd-edit,
subsystem-edit. Add fixtures for negative validate cases. Fix
normalizeUuids in meta-validate/meta-info configs.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

tests/skills/cases/skd-compile/calculated-fields.json

@@ -0,0 +1,18 @@
+{
+  "name": "СКД с вычисляемыми полями",
+  "params": { "outputPath": "Template.xml" },
+  "input": {
+    "dataSets": [{
+      "name": "Основной",
+      "query": "ВЫБРАТЬ Продажи.Номенклатура, Продажи.Количество, Продажи.Цена, Продажи.Закупка ИЗ РегистрНакопления.Продажи КАК Продажи",
+      "fields": ["Номенклатура", "Количество: decimal(15,3)", "Цена: decimal(15,2)", "Закупка: decimal(15,2)"]
+    }],
+    "calculatedFields": [
+      { "dataPath": "Маржа", "expression": "Цена - Закупка", "title": "Маржа" },
+      { "dataPath": "Наценка", "title": "Наценка, %", "expression": "(Цена - Закупка) / Закупка * 100", "valueType": "decimal(10,2)" }
+    ]
+  },
+  "expect": {
+    "files": ["Template.xml"]
+  }
+}