test: three ignored tests pass again and run in CI (#679, #562) (#1663)

Thanks @PhilippBischoff0.

apps/solidcraft-cli/tests/action_matrix.rs

@@ -1519,7 +1519,6 @@ fn sketches_on_loft_and_sweep_faces() {
 }
 
 #[test]
-#[ignore = "fails until #562 is fixed"]
 fn press_pull_on_the_pi_case_floor() {
     reproduces(
         Some("tests/action_matrix/designs/pi-case.solidcraft"),

crates/engine/src/cmd/lineage_face_tests.rs

@@ -309,7 +309,6 @@ fn every_flat_face_of_a_block_and_a_flush_step_takes_a_sketch() {
 /// #681 as reported: one sketch of a 2 x 2 grid, three cells extruded up (an elbow) and three
 /// joined down (the inverse elbow).
 #[test]
-#[ignore = "the join of the elbow down fails until #679 is fixed"]
 fn every_flat_face_of_an_elbow_up_and_an_elbow_down_takes_a_sketch() {
     let mut s = Session::default();
     run(&mut s, "sketch.create", json!({"plane": "XY", "name": "Grid"}));

crates/kernel/src/curvecorner_tests.rs

@@ -244,10 +244,9 @@ fn a_round_ending_in_an_earlier_round_matches_both_together() {
     }
 }
 
-/// The back edge rounded first, then the arc's top edge: the arc's round leaves 0.05 mm³ more at
-/// the knife-edge tip than both together, or the other order.
+/// The back edge rounded first, then the arc's top edge: the same solid as both together, or the
+/// other order (the arc's round once left 0.05 mm³ more at the knife-edge tip).
 #[test]
-#[ignore = "not yet: the arc's round after the back edge's leaves 0.05 mm³ more at the tip"]
 fn the_arc_rounded_after_the_back_edge_matches_both_together() {
     one_then_the_other(BACK, arc_top());
 }