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/meta-edit/remove-attribute.json

@@ -0,0 +1,20 @@
+{
+  "name": "Удаление реквизита из справочника",
+  "preRun": [
+    {
+      "script": "meta-compile/scripts/meta-compile",
+      "input": {
+        "type": "Catalog",
+        "name": "Контрагенты",
+        "attributes": ["ИНН: String(12)", "Устаревший: String(50)"]
+      },
+      "args": { "-JsonPath": "{inputFile}", "-OutputDir": "{workDir}" }
+    }
+  ],
+  "params": { "objectPath": "Catalogs/Контрагенты" },
+  "input": {
+    "operations": [
+      { "op": "remove-attribute", "name": "Устаревший" }
+    ]
+  }
+}