feat(skills): integrate optional test governance workflows from PR 3413

Preserve complete contributor head. Keep current-session invocation, project-defined verification gates and existing task authorization; no new commands or completion authority. Disposable Claude/Codex install and removal verified.

package.json

@@ -449,6 +449,7 @@
     "skills/marketing-campaign/",
     "skills/master-agreement-generator/",
     "skills/ml-adoption-playbook/",
+    "skills/module-regression/",
     "skills/motion-advanced/",
     "skills/motion-foundations/",
     "skills/motion-patterns/",
@@ -478,6 +479,7 @@
     "skills/taste-application/",
     "skills/taste-distillation/",
     "skills/tasteforge-video/",
+    "skills/test-collaboration/",
     "skills/tinystruct-patterns/",
     "skills/uncloud/",
     "skills/vite-patterns/",