test(epoll_create): lock in epoll_create1 args[0] flags capture

Audited epoll_create/epoll_create1 against man 2 epoll_create.
Implementation already correct: both classify as KindEventfd (fd-creating),
epoll_create(size) hardcodes flags=0 (no flags arg), epoll_create1(flags)
reads ctx->args[0], and exit captures the returned fd via ev->ret.

Add FormatEpollCreate1/FormatExitEpollCreate1 fixtures and
TestGenerateEpollCreate1HandlerUsesArg0Flags as the positive counterpart to
the existing TestGenerateEpollCreateHandlerUsesZeroFlags negative test,
asserting the enter handler captures args[0] as flags rather than 0.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

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