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

.opencode/state/upstream.json

@@ -3,6 +3,5 @@
   "commit": "49dd158d1076134a641b33efb035946536778336",
   "commit_date": "2026-10-09T11:56:49+01:00",
   "upstream_version": "1.3.1",
-  "synced_at": null,
-  "note": "HEAD observed during phase-0 analysis; upstream/ snapshot not vendored yet"
+  "synced_at": "2026-10-14T09:54:19.512Z"
 }