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-edit/add-total.json

@@ -0,0 +1,21 @@
+{
+  "name": "Добавление итога",
+  "preRun": [
+    {
+      "script": "skd-compile/scripts/skd-compile",
+      "input": {
+        "dataSets": [{
+          "name": "Основной",
+          "query": "ВЫБРАТЬ Т.Номенклатура, Т.Количество ИЗ Регистр КАК Т",
+          "fields": ["Номенклатура", "Количество: decimal(15,3)"]
+        }]
+      },
+      "args": { "-DefinitionFile": "{inputFile}", "-OutputPath": "{workDir}/Template.xml" }
+    }
+  ],
+  "params": {
+    "templatePath": "Template.xml",
+    "operation": "add-total",
+    "value": "Количество: Сумма"
+  }
+}