Replace lexical Rust fragments with real modules

crates/lazaret-host-coordinator/tests/runtime-composition.rs

@@ -610,6 +610,23 @@ fn wait_for_signal_lines(
     ))
 }
 
-include!("runtime-composition/handoff.rs");
-include!("runtime-composition/fixtures.rs");
-include!("runtime-composition/network.rs");
+#[path = "runtime-composition/fixtures.rs"]
+mod fixtures;
+#[path = "runtime-composition/handoff.rs"]
+mod handoff;
+#[path = "runtime-composition/network.rs"]
+mod network;
+
+use fixtures::{Fixture, NetworkFixture};
+use handoff::{
+    attached_runsc_loss_stops_guest, failure, host_coordinator_loss_stops_guest,
+    lost_acknowledgment_refuses_target_work, matrix_io, normal_stop_and_stop_resume,
+    replaced_handoff_authority_refuses_target_work, require_matrix_prerequisites,
+    run_handoff_matrix, run_host_coordinator_driver, run_network_cases,
+    runtime_supervisor_loss_stops_guest,
+};
+use network::{
+    failed_probe_blocks_sandbox_start, hex, host_path, lock_file, networked_sandbox_view_isolated,
+    run_sandbox_network_probe, sandbox_participant, stage_benchmark_rootfs_and_control,
+    stage_rootfs_and_control,
+};