feat: add cf-edit/validate/info, epf-init/validate/add-form, erf-init tests (batches 6+7)

7 new skills covered. All 28 tests across 16 skills passing.

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

tests/skills/cases/epf-validate/_skill.json

@@ -0,0 +1,11 @@
+{
+  "script": "epf-validate/scripts/epf-validate",
+  "setup": "none",
+  "args": [
+    { "flag": "-ObjectPath", "from": "workPath", "field": "objectPath" }
+  ],
+  "snapshot": {
+    "root": "workDir",
+    "normalizeUuids": true
+  }
+}