[PurHur]

Summary

• Convert newlines to <br /> inside highlight spans in HighlightEngine::escapeAndFormat() to match Zend ext/standard/highlight.c
• Color T_INLINE_HTML as default black (#000000) instead of keyword green — plain-text file lines match Zend

php-src reference

• ext/standard/highlight.c / php_highlight.h — HTML assembly with <br /> line separators

PHP implementation

• ext/standard/HighlightEngine.php

Verification

./script/docker-exec.sh -- bash -lc 'php bin/vm.php test/repro/maintainer_gap_highlight_file_br.php'
# br_count=2
# content_newline=false
# ok

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && vendor/bin/phpunit --filter highlight'
# OK (28 tests, 37 assertions)

Closes #17557

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