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SCOPE_GENERATION_TEST_LOCK is a std::sync::Mutex held across await points in test_full_tail_stop_spawn_receipt_register_save and test_relay_mesh_preflight_precedes_stop to prevent concurrent tests from advancing the generation counter mid-test. The deadlock risk is acceptable in test-only code: the lock is never held across blocking operations, only across async coordination inside a single test. Suppress the lint explicitly with a comment explaining the rationale. Co-authored-by: Will Pfleger <pfleger.will@gmail.com> Signed-off-by: Will Pfleger <pfleger.will@gmail.com>