Add fleet topology epidemiology: strain plague map and mining interrupt fixes.

Strain nodes replace host nodes in FleetTopologyMap; server queues epidemiology_fix on auth and reports interrupts to AI and Seer.

server/internal/ai/court_commands_test.go

@@ -64,6 +64,9 @@ func TestParseCommandsSpreadRetryLane(t *testing.T) {
 }
 
 func TestCourtCommandsNeedRetryElevation(t *testing.T) {
+	if !CourtCommandsNeedRetryElevation([]Command{{Type: CmdSpreadGraft}}) {
+		t.Fatal("spread_graft should require L4 elevation")
+	}
 	if !CourtCommandsNeedRetryElevation([]Command{{Type: CmdSpreadRetryLane}}) {
 		t.Fatal("expected spread_retry_lane to need L4")
 	}