Fix cpan random tester output buffering#859
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Stream jcpan output directly to each target log and parse results from the log file instead of keeping the entire target output in memory. Keep only a bounded tail for fallback diagnostics so chatty long-running CPAN tests do not grow the tester process until it is killed by the OS. Generated with [Codex](https://openai.com/codex) Co-Authored-By: Codex <codex@openai.com>
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Summary
cpan_random_tester.plchild output directly to the per-module log file instead of buffering fulljcpanoutput in memory.psexec noise during timeout cleanup fallback.Test Plan
perl -c dev/tools/cpan_random_tester.pljcpanharness recordedChatty::Passfrom a 2.49 MB log.jcpanharness ignoredSIGTERM; runner escalated toSIGKILL, recorded a timeout, and exited normally.git diff --checkmakeGenerated with Codex