[PurHur]

Summary

• Register date_sunrise() and date_sunset() in ext/standard/ with VM host bridge via VmDate (php-src ext/date/php_date.c).
• Add PHP 8.4 SUNFUNCS_RET_* constants to Module::init() and StdlibConstants.
• Shared arg parsing in VmDateSunFunc.php; JIT/AOT deferred (VM-first v1 per issue).

php-src reference

• ext/date/php_date.c — PHP_FUNCTION(date_sunrise), PHP_FUNCTION(date_sunset)

PHP implementation

• ext/standard/VmDate.php — dateSunrise() / dateSunset() host bridge
• ext/standard/date_sunrise.php, date_sunset.php — VM builtins
• ext/standard/VmDateSunFunc.php — shared Z_PARAM parsing

C runtime shrink

No new C in runtime/ or lib/AOT/runtime/ (only phpc_progress.c remains frozen ABI).

Verification

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh
php test/repro/maintainer_date_sunrise_sunset.php
php bin/vm.php test/repro/maintainer_date_sunrise_sunset.php
vendor/bin/phpunit --filter date_sunrise_sunset_basic
'

Output:

rise_ok
set_ok
1782013676
1782072990
rise_ok
set_ok
1782013676
1782072990
OK (2 tests, 2 assertions)

Closes #6137

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