fix(launch_manager): enable ASSERT_DBG in unit tests

[hskang-amelia]

Summary

Follow-up to #542 (comment: #542 (comment)).

lm_cc_test (the shared cc_test wrapper used by launch_manager's unit tests, tests/utils/bazel/unit_test.bzl) never defined SCORE_LANGUAGE_FUTURECPP_ASSERT_LEVEL_DEBUG. Without it, SCORE_LANGUAGE_FUTURECPP_ASSERT_DBG/_DBG_MESSAGE checks compile down to a no-op dummy (see score/language/futurecpp's assert.hpp), so every debug-level assertion in launch_manager was silently unchecked in CI — build/link succeeds either way, so this was easy to miss.

Several existing call sites rely on this macro and were never actually being exercised:

• score/launch_manager/src/daemon/src/process_group_manager/details/graph.cpp
• score/launch_manager/src/daemon/src/process_group_manager/details/process_info_node.cpp
• score/launch_manager/src/daemon/src/process_group_manager/details/dependency_graph.hpp
• score/launch_manager/src/daemon/src/common/alive_interface_path.hpp
• score/launch_manager/src/lm_control/src/details/lm_control_impl.hpp

Wires the define into lm_cc_test itself so it applies uniformly to all launch_manager unit tests, rather than adding it target-by-target.

Test plan

• bazel test --lockfile_mode=error --config=x86_64-linux //score/launch_manager/... — all previously-passing tests still pass with the define enabled (verified specifically graph_UT and process_group_manager_UT, which exercise the affected call sites)
• buildifier --mode=check on the changed .bzl file
• CI

Fixes the follow-up raised in #542.

[github-actions]

License Check Results

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[danth]

Is it possible to also enable this for integration tests?

[hskang-amelia]

Is it possible to also enable this for integration tests?

Good question — yes, it's possible, but it needs a bit more than the one-line macro change this PR makes for unit tests. lm_cc_test only affects the cc_test binary it wraps, but the integration tests here link the actual production launch_manager daemon binary (//score/launch_manager) directly as the binary under test, so enabling the define there would mean enabling it on the same target that ships in production — so I prototyped this as a separate opt-in build variant instead:

• Split the daemon's cc_binary into a small macro (launch_manager_binary) so a second target, launch_manager_debug_asserts, can share the same srcs/deps but add SCORE_LANGUAGE_FUTURECPP_ASSERT_LEVEL_DEBUG, leaving the production launch_manager target untouched.
• Pointed the binaries list in each tests/integration/*/BUILD at the debug variant instead.
• Had to add a binary_renames option to integration_test() (backed by pkg_files's renames) so the packaged binary still shows up as launch_manager in the test environment — the test scripts hardcode that filename, and swapping the Bazel target name alone changes the default output filename too.

Verified locally in host mode: 19 of 21 integration tests pass unchanged with the debug-assert binary; the other 2 failures reproduce identically on main with no changes, so they're pre-existing local environment issues, not caused by this.

Happy to open this as a follow-up PR on top of this one if that's useful — didn't want to bundle it into #579 since it touches integration.bzl and 21 test BUILD files. Let me know if you'd rather I fold it in here instead.