refactor(driver): require Default for Control

[George-Miao]

Close #741, again

[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Refactors driver operation control initialization by requiring Default for OpCode::Control and switching init to initialize an existing control value in-place, enabling control storage to be created up-front.

Changes:

• Updated all OpCode::init implementations to the new fn init(&mut self, ctrl: &mut Self::Control) signature.
• Added Default implementations/derives for multiple Control types (and SysSlice) to satisfy the new trait bound.
• Refactored Carrier to store initialized control state directly (removing MaybeUninit flow) and to initialize based on stored DriverType.

Reviewed changes

Copilot reviewed 19 out of 19 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
compio-runtime/tests/event.rs	Updates test opcode init signature to in-place control init
compio-runtime/src/fd/poll_fd/windows.rs	Updates Windows event opcode init signature
compio-process/src/windows.rs	Updates process wait opcode init signature
compio-fs/src/stdio/windows.rs	Updates stdio blocking opcodes init signature
compio-driver/tests/splice.rs	Updates splice test opcode init signature
compio-driver/src/sys_slice.rs	Adds Default for SysSlice; updates construction docs
compio-driver/src/sys/unix_op.rs	Adds Default for various vectored/msg controls and switches to in-place control creation
compio-driver/src/sys/stub/op.rs	Updates stub opcodes to new init signature
compio-driver/src/sys/stub/mod.rs	Requires Control: Default and changes init signature in stub trait
compio-driver/src/sys/poll/op.rs	Updates poll driver ops to new init signature; adds Default for AIO controls
compio-driver/src/sys/poll/mod.rs	Requires Control: Default and changes init signature in poll trait
compio-driver/src/sys/iour/op/mod.rs	Updates io_uring ops to new init signature; introduces SmallVec for slices
compio-driver/src/sys/iour/op/managed.rs	Updates managed io_uring ops to in-place control init; adds control defaults
compio-driver/src/sys/iour/mod.rs	Requires Control: Default and changes init signature in io_uring trait
compio-driver/src/sys/iocp/op.rs	Updates IOCP ops to new init signature; derives Default for several controls
compio-driver/src/sys/iocp/mod.rs	Requires Control: Default and changes init signature in IOCP trait
compio-driver/src/sys/fusion/op.rs	Updates fusion wrappers to forward new init signature
compio-driver/src/key.rs	Switches Carrier creation/init flow to new API
compio-driver/src/control.rs	Refactors Carrier to store initialized control directly and init in-place

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