feat: add role-*, subsystem-* tests (batches 4+5)

- role-compile, role-validate, role-info: 3 cases
- subsystem-compile, subsystem-validate, subsystem-info: 3 cases
- 34 tests across 22 skills, all passing

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

tests/skills/cases/subsystem-compile/_skill.json

@@ -0,0 +1,12 @@
+{
+  "script": "subsystem-compile/scripts/subsystem-compile",
+  "setup": "empty-config",
+  "args": [
+    { "flag": "-DefinitionFile", "from": "inputFile" },
+    { "flag": "-OutputDir", "from": "workDir" }
+  ],
+  "snapshot": {
+    "root": "workDir",
+    "normalizeUuids": true
+  }
+}