simplify CQE handler

[wokron]

No description provided.

[Copilot]

Pull request overview

Refactors CQE handler integration to simplify completion processing by switching CQE handlers from a stateful handle_cqe/extract_result API to a callable operator()(io_uring_cqe*) -> result API.

Changes:

• Reworked CQE handlers to return results directly via operator().
• Updated OpSender/OpFinishHandle plumbing to store and invoke CQE handlers directly (no tuple-stored handler args).
• Updated tests to construct handles with an explicit CQE handler instance.

Reviewed changes

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

Show a summary per file

File	Description
tests/test_ring.cpp	Updates handle construction to pass a CQE handler instance.
tests/test_op_finish_handle.cpp	Updates finish-handle constructions to pass a CQE handler instance.
include/condy/senders.hpp	Simplifies sender types to store a CQE handler instance and deduce ReturnType from invocation.
include/condy/sender_operations.hpp	Updates builder helpers to construct CQE handler instances up-front.
include/condy/op_states.hpp	Simplifies operation state ctor to forward handle args directly.
include/condy/finish_handles.hpp	Updates finish handles to invoke CQE handlers via operator() and pass results directly to receivers.
include/condy/cqe_handler.hpp	Rewrites CQE handlers to implement operator() returning the completion result.
include/condy/concepts.hpp	Updates CQEHandlerLike concept to require only callability via handler(cqe).

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[Copilot]

Pull request overview

Copilot reviewed 10 out of 10 changed files in this pull request and generated 5 comments.

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