Use array_any/array_all/array_find (8.4) and fix latent strpos prefix-test bugs

[lisachenko]

Summary

From the PHP 8.5 support audit (PR #597); user-approved modernization batch. Includes two latent bugs found on the way.

Latent bugs (fix regardless)

1. src/Instrument/FileSystem/Enumerator.php:158:

   if (strpos($path, $this->rootDirectory, 0) === false) {

   This is a substring-anywhere test posing as a prefix test — /other/app passes validation if it merely contains the root path string. Intent is !str_starts_with($path, $this->rootDirectory).
2. tests/Instrument/Transformer/WeavingTransformerTest.php:136:

   $this->assertFalse(strpos($proxyContent, '\\\\Exception'));

   Passes when the needle sits at offset 0 (the classic pre-8.0 trap). Should be assertStringNotContainsString.

Modernizations

• src/Instrument/FileSystem/Enumerator.php:84 — strpos(PHP_OS, 'WIN') === 0 → PHP_OS_FAMILY === 'Windows'; :108 — strpos(...) !== 0 → !str_starts_with(...)
• src/Instrument/PathResolver.php:66, src/Core/AdviceMatcher.php:90 — strpos(...) !== false → str_contains(...)
• array_any/array_all/array_find (8.4) for hand-rolled loops:
  • src/Aop/Pointcut/OrPointcut.php:56-62 → array_any
  • src/Aop/Pointcut/AndPointcut.php:59-65 → array_all
  • src/Instrument/FileSystem/Enumerator.php:112-129 include/exclude loops → array_any
  • src/Proxy/Part/AbstractInterceptedPropertyGenerator.php:101-103 union-type scan → array_any
  • src/Instrument/Transformer/WeavingTransformer.php:567-572 flag loop → array_any; :513-527 comma scans → array_find
• src/Instrument/Transformer/WeavingTransformer.php:492 — end($groupPositions) + @var annotation; array_last() is 8.5-only, so keep end() until the floor rises (note in code), or drop the annotation via a local typed helper.
• tests/Functional/ReflectionFilenameTest.php:49 — ReflectionProperty::setValue(null) single-arg form is deprecated since 8.3 (the suite's only deprecation); pass the object/null pair explicitly.

Pipe-operator (|>) rewrites of internal call chains stay blocked until the package floor is ^8.5 — not part of this issue.