test(gateway): run the cross-Shard command transport test in Core CI

.github/workflows/module-durable.yml

@@ -101,6 +101,11 @@ jobs:
           cargo test -p lyracore-gateway --bin lyracore-gateway stdb::subscriptions::meeting_stone_durable_tests::seekers_on_two_world_shards_form_one_party_that_reaches_every_mirror -- --ignored --exact
           cargo test -p lyracore-gateway --bin lyracore-gateway stdb::armor::tests::resistance_projection_adds_property_effects_only_while_the_item_is_worn_and_unbroken -- --ignored --exact
 
+      # No Package registers a client command here, so the Module's fixture command carries it.
+      - name: Run the cross-Shard command transport tests
+        if: matrix.shard == 1
+        run: cargo test -p lyracore-gateway --bin lyracore-gateway stdb::subscriptions::party_command_durable_tests -- --ignored --test-threads=1
+
       - name: Upload the standalone logs
         if: failure()
         uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4.6.2

crates/lyracore-test-support/README.md

@@ -7,8 +7,3 @@ can publish the selected Core Module, call reducers, read durable state and reta
 Core tests use this crate's workspace. Package test runners set `LYRACORE_TEST_CORE` to the explicit
 Core checkout used for both builds and evidence. Package-specific setup and assertions belong in
 the Package repository.
-
-The Gateway coordinator also supports Package-owned tests of its private routing operations. A
-test runner can set `LYRACORE_COORDINATOR_TEST_SOURCE` to a Rust source file. Cargo compiles that
-source under `stdb::subscriptions::package_tests` only in test builds. Normal Core tests need no
-Package source, and production Gateway builds do not compile these Package tests.

gateway/src/stdb/subscriptions.rs

@@ -8326,4 +8326,5 @@ mod roster_relay_durable_tests;
 mod meeting_stone_durable_tests;
 
 #[cfg(test)]
-include!(concat!(env!("OUT_DIR"), "/package-coordinator-tests.rs"));
+#[path = "subscriptions_party_command_durable_tests.rs"]
+mod party_command_durable_tests;