Scenario names advertised via list_scenarios (force_* and simulate_*).
Seed scenarios are NOT advertised — the spec treats them as universal
request-time capabilities, not a discoverable subset. The upstream
ListScenariosSuccess['scenarios'] union includes seeds (open-for-
extension), so we explicitly subtract them here.
Scenario names advertised via
list_scenarios(force_* and simulate_*). Seed scenarios are NOT advertised — the spec treats them as universal request-time capabilities, not a discoverable subset. The upstreamListScenariosSuccess['scenarios']union includes seeds (open-for- extension), so we explicitly subtract them here.