GRM-165: feat: adopt spec-driven CI gates, create_dependency_pr, and pr-review skill

Co-authored-by: emil User <emil.simeonov@tutanota.com>

.devin/skills/testing-and-debugging/SKILL.md

@@ -35,6 +35,12 @@ produces false failures (missing dependencies, wrong Python version).
 | All platforms | `make molecule-all` | All 6 scenarios on all 4 OSes |
 | Parallel | `make molecule-all-parallel` | MOLECULE_JOBS=4 |
 
+### Spec-Driven Workflow
+
+Every PR requires a spec file at `docs/specs/<TASK-ID>.md`. See the
+`spec-driven-development` skill for the full workflow and template.
+CI validates the spec before running expensive jobs.
+
 ## Pre-Push Verification
 
 **Before pushing any branch:**