Fix extended errno alias for CPANPLUS#788
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Initialize $^E with the same errno dualvar used by $!, matching Unix Perl behavior for numeric and string errno contexts. Add regression coverage for $^E startup, assignment, localization, and clearing behavior, and update the CPANPLUS progress note with the resolved File::Copy warning. Generated with [Codex](https://openai.com/codex) Co-Authored-By: Codex <codex@openai.com>
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Summary
$^Ewith the same errno dualvar used by$!, matching Unix Perl behavior for CPANPLUS/File::Copy.$^Estartup, assignment, localization, and clearing behavior.dev/modules/cpanplus.mdwith the resolved warning and remaining fresh-home verification note.Tests
timeout 60 ./jperl src/test/resources/unit/errno_special_vars.tmaketimeout 1200 ./jcpan -t CPANPLUSNote: the sandboxed CPANPLUS run hit
uncompress: /dev/stdout: Operation not permittedin Archive::Extract's.Ztest. The listed CPANPLUS run was rerun outside the sandbox and passed withFiles=20, Tests=1751, Result: PASS.