Adapt Sol 6.1 native multi-agent and workflow compatibility

scripts/check_repository.py

@@ -15,6 +15,7 @@ def check() -> list:
                  "references/platforms.md", "references/evidence-packet.md",
                  "references/routing-matrix.md", "references/escalation.md", "references/fleet.md",
                  "references/gpt6-adaptation.md", "references/model-economics.md",
+                 "references/sol61-adaptation.md",
                  "scripts/validate_decision_record.py", "scripts/validate_evidence_packet.py"):
         if not (skill / name).is_file():
             errors.append("missing skill resource: " + name)