feat: add form-*, skd-*, misc tests (batches 1, 2, 10)

New skills covered:
- form-add, form-compile, form-validate, form-info (batch 1)
- skd-compile, skd-validate, skd-info (batch 2)
- help-add, template-add, template-remove, meta-remove (batch 10)

Findings: form-add/form-info path resolution inconsistency,
meta-remove self-reference requires -Force.

45 tests across 33 skills, all passing.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

tests/skills/cases/form-validate/valid-form.json

@@ -0,0 +1,20 @@
+{
+  "name": "Корректная форма проходит валидацию",
+  "preRun": [
+    {
+      "script": "meta-compile/scripts/meta-compile",
+      "input": { "type": "Catalog", "name": "Товары" },
+      "args": { "-JsonPath": "{inputFile}", "-OutputDir": "{workDir}" }
+    },
+    {
+      "script": "form-add/scripts/form-add",
+      "args": { "-ObjectPath": "{workDir}/Catalogs/Товары.xml", "-FormName": "Форма" }
+    },
+    {
+      "script": "form-compile/scripts/form-compile",
+      "input": { "title": "Тест", "attributes": [{ "name": "Объект", "type": "FormDataStructure", "main": true }], "elements": [{ "type": "InputField", "dataPath": "Объект.Наименование" }] },
+      "args": { "-JsonPath": "{inputFile}", "-OutputPath": "{workDir}/Catalogs/Товары/Forms/Форма/Ext/Form.xml" }
+    }
+  ],
+  "params": { "formPath": "Catalogs/Товары/Forms/Форма" }
+}