support sq_rewind

[wokron]

for linux 7.0

[Copilot]

Pull request overview

Adds support for IORING_SETUP_SQ_REWIND (liburing ≥ 2.14) as a new RuntimeOptions toggle, and wires it into Runtime initialization, with a corresponding runtime-options test.

Changes:

• Add RuntimeOptions::enable_sq_rewind() (guarded by liburing version) and track it via a new enable_sq_rewind_ flag.
• Apply IORING_SETUP_SQ_REWIND to io_uring_params.flags when the option is enabled.
• Add a gated test case validating that a runtime can be constructed and execute many spawned tasks with sq_rewind enabled.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
tests/test_runtime_options.cpp	Adds a liburing-version-gated test for enable_sq_rewind and fixes the preprocessor closing for the preceding enable_no_mmap test block.
include/condy/runtime_options.hpp	Introduces enable_sq_rewind() and enforces mutual exclusion with sqpoll; refines mutual-exclusion error messages among related options.
include/condy/runtime.hpp	Sets IORING_SETUP_SQ_REWIND during ring initialization when enabled in RuntimeOptions (guarded by liburing version).

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