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/cfe-init/patch-purpose.json

@@ -0,0 +1,8 @@
+{
+  "name": "Расширение-исправление (Patch)",
+  "params": { "name": "Исправление", "outputDir": "ext" },
+  "args_extra": ["-Purpose", "Patch"],
+  "expect": {
+    "files": ["ext/Configuration.xml"]
+  }
+}