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/mxl-validate/valid-print-form.json

@@ -0,0 +1,56 @@
+{
+  "name": "Валидация печатной формы",
+  "preRun": [
+    {
+      "script": "mxl-compile/scripts/mxl-compile",
+      "input": {
+        "columns": 5,
+        "page": "A4-portrait",
+        "columnWidths": { "1": "1x", "2": "3x", "3": "1x", "4": "1x", "5": "1x" },
+        "fonts": {
+          "default": { "face": "Arial", "size": 10 },
+          "bold": { "face": "Arial", "size": 10, "bold": true },
+          "header": { "face": "Arial", "size": 14, "bold": true }
+        },
+        "styles": {
+          "title": { "font": "header", "align": "center" },
+          "bordered": { "border": "all" },
+          "bordered-right": { "border": "all", "align": "right" },
+          "total": { "font": "bold", "border": "top", "align": "right" }
+        },
+        "areas": [
+          {
+            "name": "Заголовок",
+            "rows": [
+              { "height": 20, "cells": [{ "col": 1, "span": 5, "style": "title", "param": "Заголовок" }] }
+            ]
+          },
+          {
+            "name": "Строка",
+            "rows": [
+              { "rowStyle": "bordered", "cells": [
+                { "col": 1, "param": "Номер" },
+                { "col": 2, "param": "Товар" },
+                { "col": 3, "param": "ЕдИзм" },
+                { "col": 4, "style": "bordered-right", "param": "Кол" },
+                { "col": 5, "style": "bordered-right", "param": "Сумма" }
+              ]}
+            ]
+          },
+          {
+            "name": "Итого",
+            "rows": [
+              { "cells": [
+                { "col": 4, "style": "total", "text": "Итого:" },
+                { "col": 5, "style": "total", "param": "Всего" }
+              ]}
+            ]
+          }
+        ]
+      },
+      "args": { "-JsonPath": "{inputFile}", "-OutputPath": "Template.xml" },
+      "cwd": "{workDir}"
+    }
+  ],
+  "params": { "templatePath": "Template.xml" }
+}