[PurHur]

Summary

• Restore Zend __toString coercion for Stringable operands on str_contains(), str_starts_with(), and str_ends_with() when the caller is not strict_types.
• VM follows the existing strcmp pattern (coerceStringBuiltinArg + InternalStrictArg::requireString under strict); JIT uses JitStringBuiltinArg::lowerCoercible instead of lower / coerceStringBuiltinArgNoObject.

Closes #15069

php-src reference

• ext/standard/string.c — php_str_contains, php_str_starts_with, php_str_ends_with, zend_parse_arg_str coercion path

Verification

./script/docker-exec.sh -- bash -lc 'cd /compiler && vendor/bin/phpunit --filter str_contains_stringable_coerce'
# OK (2 tests, 2 assertions) — VM + JIT compliance

./script/docker-exec.sh -- php bin/vm.php -r '
class C { public function __toString(): string { return "obj"; } }
var_export(str_contains(new C(), "obj"));
'
# true

./script/docker-exec.sh -- bash -lc 'cd /compiler && php bin/compile.php -l test/compliance/cases/stdlib/str_contains_stringable_coerce.phpt'
# (use inline script) php bin/compile.php -l with StringableObj repro — lint OK

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