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The ironclaw binary only handles SIGINT (via tokio::signal::ctrl_c), not SIGTERM. When conftest.py sent SIGTERM during teardown, the OS killed the process immediately without running atexit handlers, so LLVM never flushed .profraw files. cargo llvm-cov report then found zero profraw files and failed. - Send SIGINT instead of SIGTERM so the existing ctrl_c handler triggers graceful shutdown → main() returns → atexit runs → profraw flushed - Increase shutdown wait from 5s to 10s for graceful cleanup - Add a diagnostic step to verify profraw files exist before the report step, making future issues visible in CI logs Co-authored-by: Claude Opus 4.6 <[email protected]>