sync: vendor mattpocock/skills @49dd158 (v1.3.1) with sync tooling

upstream/skills/engineering/grill-with-docs/SKILL.md

@@ -0,0 +1,7 @@
+---
+name: grill-with-docs
+description: A relentless interview to sharpen a plan or design, which also creates docs (ADR's and glossary) as we go.
+disable-model-invocation: true
+---
+
+Call the Skill tool twice, for "grilling" and "domain-modeling".