Client tracing preparations

[mahkoh]

No description provided.

[Copilot]

Pull request overview

This PR prepares groundwork for client tracing by extending the wire parser/codegen flow with shared message iteration and request/event metadata, and by adding io_uring futex op support and related SQE/sys updates.

Changes:

• Add io_uring futex wait/wake tasks and integrate them into the io_uring task caching infrastructure.
• Extend io_uring SQE/sys definitions with the new union field and newer opcode constants.
• Refactor wire parsing/codegen to expose ParseResult::messages() and track whether a parsed message is a request.

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
wire-to-xml/src/main.rs	Switch to ParseResult::messages() for unified message iteration when computing protocol version.
src/utils/array.rs	Add SliceExt helpers for viewing parts of slices as fixed-size arrays.
src/io_uring/sys.rs	Update SQE layout with union6 and extend io_uring opcode constants up to the newer IORING_OP_LAST.
src/io_uring/ops/futex.rs	Introduce futex wait/wake io_uring operations and encoding.
src/io_uring/ops.rs	Export the new futex ops module.
src/io_uring.rs	Wire futex tasks into io_uring caches and re-export FutexObj.
build/wire/parser.rs	Track request/event kind per Message and add ParseResult::messages() iterator helper.
build/wire.rs	Refactor to parse files first and then write code; use messages() helper for generation.

Suppressed comments (1)

src/utils/array.rs:36

• split_array currently uses unsafe pointer casting and get_unchecked. This can be expressed safely via split_at + TryInto, which keeps the method safe without relying on unsafe internals.

    fn split_array<const N: usize>(&self) -> Option<(&[Self::T; N], &[Self::T])> {
        if self.len() < N {
            return None;
        }
        let array = unsafe { &*self.as_ptr().cast::<[Self::T; N]>() };

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