make ships orbit their targets

src/test/ConfigLoaderTest.cpp

@@ -76,6 +76,8 @@ TEST_CASE("ConfigLoader loads the committed bin/config/ configs end-to-end", "[c
     REQUIRE(cfg.world.regions.enemyBufferWidth_tiles == 15);
     REQUIRE(cfg.world.expansion.columnsPerExpansion_tiles == 10);
     REQUIRE(cfg.world.push.bossAdvanceSeconds == Approx(60.0));
+    REQUIRE(cfg.world.orbitFactor == Approx(0.8));
+    REQUIRE(cfg.world.rallyOrbitRadius_tiles == Approx(5.0));
 
     // Spot-check that a config-derived formula computes as expected.
     // threat_rate_formula = "x": evaluates to the input value.
@@ -163,6 +165,8 @@ belt_speed_mps = 20
 starting_building_blocks = 100
 tunnel_max_distance_tiles = 10
 departure_interval_seconds = 20
+orbit_factor = 0.8
+rally_orbit_radius_tiles = 5.0
 
 [regions]
 asteroid_width_tiles = 40
@@ -211,6 +215,8 @@ belt_speed_mps = 20
 starting_building_blocks = 100
 tunnel_max_distance_tiles = 10
 departure_interval_seconds = 20
+orbit_factor = 0.8
+rally_orbit_radius_tiles = 5.0
 
 [regions]
 asteroid_width_tiles = 40