feat(game): add persistent bush-wall breakthroughs

test/host/test_game_mechanics.c

@@ -346,6 +346,37 @@ static void test_victory_and_draw_window(void) {
     printf("game outward result window: PASS (200 ms draw boundary, 201 ms winner)\n");
 }
 
+static void test_persistent_bush_wall_breakthrough(void) {
+    maze32_maze_t maze;
+    open_test_grid(&maze);
+    maze.passages[index_of(2U, 2U)] &= (uint8_t)~MAZE32_PASSAGE_EAST;
+    maze.passages[index_of(3U, 2U)] &= (uint8_t)~MAZE32_PASSAGE_WEST;
+    maze32_game_t game = active_game(&maze);
+    game.players[0].position = (maze32_cell_t){2U, 2U};
+
+    for (uint8_t hit = 1U; hit < MAZE32_GAME_BREAKTHROUGH_HITS; ++hit) {
+        maze32_game_command_result_t result =
+            move_player(&game, MAZE32_GAME_ROLE_PLAYER_ONE, MAZE32_GAME_DIRECTION_EAST, hit * 500U);
+        assert(result.result == MAZE32_GAME_RESULT_BLOCKED);
+        assert(result.breakthrough_hits == hit);
+        assert(!result.breakthrough_opened);
+        assert(game.players[0].position.x == 2U);
+    }
+    maze32_game_command_result_t result =
+        move_player(&game, MAZE32_GAME_ROLE_PLAYER_ONE, MAZE32_GAME_DIRECTION_EAST, 2500U);
+    assert(result.result == MAZE32_GAME_RESULT_ACCEPTED && result.breakthrough_opened);
+    assert(result.breakthrough_hits == MAZE32_GAME_BREAKTHROUGH_HITS);
+    assert(game.players[0].position.x == 3U);
+    assert(game.opened_passages[index_of(2U, 2U)] & MAZE32_PASSAGE_EAST);
+    assert(game.opened_passages[index_of(3U, 2U)] & MAZE32_PASSAGE_WEST);
+
+    game.players[1].position = (maze32_cell_t){3U, 2U};
+    result = move_player(&game, MAZE32_GAME_ROLE_PLAYER_TWO, MAZE32_GAME_DIRECTION_WEST, 2600U);
+    assert(result.result == MAZE32_GAME_RESULT_ACCEPTED);
+    assert(game.players[1].position.x == 2U);
+    printf("game persistent bush-wall breakthrough: PASS (five impacts, shared passage)\n");
+}
+
 int main(void) {
     test_inventory_drop_and_sabotage();
     test_atomic_meeting_return();
@@ -353,6 +384,7 @@ int main(void) {
     test_vision_artifact_duration();
     test_compass_and_role_projections();
     test_victory_and_draw_window();
+    test_persistent_bush_wall_breakthrough();
     puts("game mechanics tests: PASS");
     return 0;
 }