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/subsystem-edit/set-property.json

@@ -0,0 +1,14 @@
+{
+  "name": "Изменение свойства подсистемы",
+  "preRun": [
+    {
+      "script": "subsystem-compile/scripts/subsystem-compile",
+      "input": { "name": "Продажи" },
+      "args": { "-DefinitionFile": "{inputFile}", "-OutputDir": "{workDir}" }
+    }
+  ],
+  "params": { "subsystemPath": "Subsystems/Продажи.xml" },
+  "input": [
+    { "operation": "set-property", "value": "{\"name\":\"IncludeInCommandInterface\",\"value\":\"false\"}" }
+  ]
+}