[fglock]

Summary

Fixes #1481 and #1448.

• Preserve control characters when parsing qw strings while trimming ordinary whitespace.
• Keep the original code reference stable while MODIFY_CODE_ATTRIBUTES handlers wrap or replace the glob, preventing recursive wrapper calls and preserving lazy compilation.
• Add focused regression tests for both issues.

Validation

• nice -n 19 make — passed.
• nice -n 19 make check-links and lychee --offline docs/about/changelog.md — passed.
• New tests pass with system Perl and on both JVM and interpreter backends.
• Regexp::Assemble 0.38 and Medusa 0.05/0.06 upstream suites pass on both backends.
• Related regressions Short-circuit expressions leak list context through scalar prototypes #1891, Fix XML::LibXSLT output mismatch in HTML::ToDocBook transforms #1892, and bug: emit Perl-compatible Deep recursion warnings #1222 pass on both backends.