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Flake audit: the whole corpus has exactly two wall-clock test deadlines — the EOF-shutdown alarm(5) and the issue-832 supervisor-spawn alarm(60), both in the mcp suite (the latter already flaked once under heavy local load). Serializing mcp costs ~6s of tail and closes the starvable-deadline class completely; every remaining parallel-wave suite is deadline-free. Signed-off-by: Martin Vogel <martin.vogel.tech@gmail.com>