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/minimal.json

@@ -0,0 +1,13 @@
+{
+  "name": "Минимальная СКД — один набор, один запрос",
+  "params": { "outputPath": "Template.xml" },
+  "input": {
+    "dataSets": [{
+      "query": "ВЫБРАТЬ Номенклатура.Наименование КАК Наименование ИЗ Справочник.Номенклатура КАК Номенклатура",
+      "fields": ["Наименование"]
+    }]
+  },
+  "expect": {
+    "files": ["Template.xml"]
+  }
+}