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/skd-compile/simple-query.json

@@ -0,0 +1,16 @@
+{
+  "name": "Простой запрос",
+  "params": { "outputPath": "Template.xml" },
+  "input": {
+    "dataSets": [
+      {
+        "name": "Основной",
+        "type": "Query",
+        "query": "SELECT 1 AS Поле"
+      }
+    ]
+  },
+  "expect": {
+    "files": ["Template.xml"]
+  }
+}