Add PHP stream support and PIE packaging

[prateekbhujel]

Summary

• accept PHP stream resources alongside Terminal\Stream enum cases
• retain resource-backed raw-mode streams until ModeToken restore
• add PIE metadata and remove the unused PECL manifest
• prepare the v0.6.0 release and extend CI to PHP 8.1

Verification

• native XAMPP PHP 8.2 build with ./configure and no enable flag
• PHPT: 32 tests, 29 passed, 3 skipped, 0 failed
• PIE 1.4.8 source build for XAMPP PHP 8.2 x86_64
• Composer 2.9.8 strict metadata validation
• PHP syntax checks and git diff --check