fix(autoload): expand the dirsep placeholder in target-dir patterns

AutoloadGenerator.php builds the target-dir pattern by quoting the path
with a <dirsep> marker in place of the separators, then replacing the
quoted marker with [\\/]. The port kept that shape, but preg_quote()
here deliberately leaves < and > alone so the regex crate does not read
\< as a word boundary, so the replacement never matched and the pattern
came out as the literal {^Main<dirsep>Foo<dirsep>}.

A root package's target-dir was therefore never stripped from files,
classmap or exclude-from-classmap, and dumping one failed outright.
Split on the separators and quote each segment instead, so the marker
never passes through preg_quote() at all.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

0 files changed, 0 insertions, 0 deletions