Participation Warmup Planner Designs the pre-promotion ramp that makes a brand a member before it is a marketer — per-community account-history expectations, a give-before-ask ledger spec, an etiquette + rule digest with last-verified dates, and the warming → active graduation criteria that channel-registry requires as state-transition evidence. It is the fourth move of the ECHO Explore phase and feeds four ECHO sub-items directly: participation-before-promotion (E2), give:ask ledger maintained (E3), owned-space entry and member-lifecycle health (E6), and the cross-community rule-conflict che…