feat: add interface-*, cfe-* tests (batches 8+9) — all skills covered

- interface-edit, interface-validate: 2 cases
- cfe-init, cfe-validate, cfe-borrow, cfe-patch-method, cfe-diff: 5 cases
- runner: switch params in preRun (true = no value)
- Findings: interface-edit JSON-in-JSON, cfe-patch-method type naming

52 tests across 40 skills, all passing (~48s).

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

tests/skills/cases/interface-edit/basic.json

@@ -0,0 +1,20 @@
+{
+  "name": "Создание командного интерфейса подсистемы",
+  "preRun": [
+    {
+      "script": "meta-compile/scripts/meta-compile",
+      "input": { "type": "Catalog", "name": "Товары" },
+      "args": { "-JsonPath": "{inputFile}", "-OutputDir": "{workDir}" }
+    },
+    {
+      "script": "subsystem-compile/scripts/subsystem-compile",
+      "input": { "name": "Склад", "objects": ["Catalogs.Товары"] },
+      "args": { "-DefinitionFile": "{inputFile}", "-OutputDir": "{workDir}" }
+    }
+  ],
+  "params": { "ciPath": "Subsystems/Склад/CommandInterface" },
+  "input": [
+    { "operation": "place", "value": "{\"command\": \"Catalog.Товары\", \"group\": \"NavigationPanel.Important\"}" }
+  ],
+  "CreateIfMissing": true
+}