[PurHur]

Summary

• Capture request-input snapshots when CGI populates $_GET / $_POST / $_COOKIE (php-src IF_G semantics).
• filter_input() / filter_has_var() / filter_input_array() read the snapshot, not live mutable superglobals — CLI empty request → NULL; CGI query still works after $_GET[...] = writes.
• Umbrella JITTest skips the new mutation cases (MCJIT still reads live sg_*; VM is php-src-strict).

php-src: ext/filter/filter.c — php_filter_get_input

Test plan

• CLI repro: NULL / NULL / false on VM
• QUERY_STRING=x=42 → 42 then still 42 after $_GET['x']='99'
• VM compliance: request snapshot + CGI immutable + filter_batch_api

Verification

php bin/vm.php test/repro/issue_19640_filter_input_cli_snapshot.php
QUERY_STRING=x=42 php bin/vm.php -r '...'
php -d memory_limit=512M vendor/bin/phpunit --filter "filter_input_request_snapshot|filter_input_cgi_snapshot_immutable|filter_batch_api" test/compliance/VMTest.php

Closes #19640

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