BDPD² — Governance of Nested Commons: Four Vignettes

Governance of nested commons — multiple shared resources coexisting under overlapping institutional structures — requires substrate-level tools that prior single-arena frameworks do not provide. This paper surveys the BDPD platform's governance affordances through four vignettes, each posing one research question at N=5 seeds with both deterministic heuristic agents and DeepSeek-flash LLM players. Two cross-cutting findings recur. First, the qualitative direction of governance effects is robust to seed variation under 3% observation noise; the quantitative depth is not. Second, LLM players consistently invert the headlines produced by heuristic baselines: under reflexive sanctioning they comply more than heuristic conservatives, under voluntary or weak sanctioning they cascade faster, under coercive exclusion conformists co-breach the pact. We close with three campaign-scale paths and frame the choice between them as the platform's next research question.