precompile: fail in (closer to) linear time #59765
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Do not allow serial compile fallbacks, since this causes performance and output degredation when serial precompile fails. The precompilepkg driver already ensured DAG ordering, so this work is not necessary or useful to repeat. A bit of code cleanup and asking for Claude to describe the argument list as well, plus a test to start to cover any of this file's code functionality in CI unit tests.