[PurHur]

Summary

• Map abs / floor / ceil to Zend stub param num in BuiltinParamNames (php-src ext/standard/basic_functions.stub.php); InternalArgInfo still advertised number.
• Zend-style abs(num: …) / floor(num: …) / ceil(num: …) work; legacy number: is rejected.
• PHP-in-PHP only — no C runtime changes.

Closes #23259

Test plan

• php bin/vm.php test/repro/issue_23259_abs_floor_ceil_named.php → ok
• vendor/bin/phpunit --filter testAbsFloorCeilZendStubNamedParams → OK
• vendor/bin/phpunit --filter named_args_abs_floor_ceil test/compliance/ → OK (6)
• php bin/compile.php -o /tmp/x test/repro/issue_23259_abs_floor_ceil_named_aot.php && /tmp/x → 3\n3
• vendor/bin/phpunit --filter abs_floor_ceil_named_params test/aot/ → OK

Not covered: floor/ceil (and float abs) under AOT already return 0 on master for positional calls — out of scope for this Reflection/named-arg fix.

Verification transcript

$ php bin/vm.php test/repro/issue_23259_abs_floor_ceil_named.php
ok
$ vendor/bin/phpunit --filter named_args_abs_floor_ceil test/compliance/
OK (6 tests, 6 assertions)
$ php bin/compile.php … issue_23259_abs_floor_ceil_named_aot.php && run
3
3
$ vendor/bin/phpunit --filter abs_floor_ceil_named_params test/aot/
OK (1 test, 5 assertions)

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