ROHME-8: raise the quorum floor to 600 gROHM — the durable setting

ROHME-8: raise the quorum floor to 600 gROHM — the durable setting WHAT THIS DOES. 1. GovernorV2.setQuorumFloor(600000000000000000000) (600 gROHM, 18-dec) V2 lands from the migration with a 100 gROHM floor. 100 was chosen to guarantee governance could restart under any conditions; it was never meant to be the long-term bar. This decree sets the floor at 600: quorum becomes max(600, 10 pct of non-excluded circulating gROHM), so 600 binds until circulating delegated supply passes 6,000 gROHM, after which the 10 pct term takes over naturally. WHY 600. Against today's ~1,391 total gROHM it demands roughly 43 pct of the entire wrapped supply participate for a decree to pass — a real mandate, while remaining clearly reachable (the electorate that passes the migration itself exceeds 1,000). Against V1's 1,000-constant it is a level the community has actually demonstrated it can clear. THE SAFETY RAILS, BOTH DIRECTIONS. Raising the floor is governance-only — the param guardian CANNOT raise, only lower. And V2 refuses any raise above the non-excluded circulating supply at execution time (FloorUnreachable), so this decree cannot recreate the V1 lockout: if circulating gROHM somehow fell below 600 between vote and execution, the execution reverts rather than bricking governance. Should quorum ever become unreachable later (supply shrinks, delegations lapse), the guardian can lower the floor again without a vote — an escape valve that grants no capture power, since quorum is participation, not approval, and every passed decree still serves the timelock delay under the CANCELLER veto. WHAT YOU ARE ACCEPTING. A six-fold raise in the participation bar over the migration's landing value. Decrees get harder to pass, deliberately. Vote against if you would rather governance stay at the 100 gROHM floor for now — the guardian cannot undo a raise you approve here except by lowering it, which is public and on-chain.