PBE 0.0.1 standalone runtime bootstrap

PHP
- First launch downloads PHP 8.5.10 x64 Non Thread Safe from the official PHP Windows distribution:
  https://downloads.php.net/~windows/releases/php-8.5.10-nts-Win32-vs17-x64.zip
- Expected SHA-256:
  22ec430195984d233eb9e62c637a945bbcda06efca2f392d9d96d62c6acd34f8
- PHP is distributed by The PHP Group under the PHP License.

Microsoft Visual C++ Redistributable
- Downloaded only when needed from:
  https://aka.ms/vs/17/release/vc_redist.x64.exe
- PBE verifies the downloaded executable has a valid Microsoft Authenticode signature before execution.

CA certificate bundle
- resources/cacert.pem is a Mozilla CA bundle provided through the Python certifi package and is used only for TLS certificate verification by the private PHP runtime.
