… of cursor rules)

Co-authored-by: Nikita <retretx@gmail.com>

- Extend io_uring_engine with register_buffers, CONNECT/ACCEPT ops
- Pack op_kind into user_data for correct completion dispatch
- Add io_context template and Linux platform alias
- Implement socket_posix TCP helpers (bind ephemeral, connect)
- Add mock_engine stubs for open/register_buffers
- Integration tests: buffer registration, TCP echo via READ/WRITE

Co-authored-by: Nikita <retretx@gmail.com>

- submission: reg_index/offset/length + read_fixed_op/write_fixed_op
- io_uring_engine: IORING_OP_READ/WRITE_FIXED, accept addr2, accept fd in completion
- poll: min_complete=0 to avoid indefinite blocking
- Tests: async ACCEPT, CONNECT (SKIP if unsupported), registered buffer echo

Co-authored-by: Nikita <retretx@gmail.com>

- io::byte_stream: consumer-owned buffer cursor (read/write positions)
- io::socket: non-owning fd handle with read/write submission helpers
- io::pipe: operator| for read_into, write_from, echo_to chains
- run_read/run_write/run_echo helpers with poll loop
- tests/v2/socket_tests: mock + TCP integration via pipe API

Co-authored-by: Nikita <retretx@gmail.com>

- io::tcp_acceptor: RAII listen socket, bind_loopback_ephemeral(out)
- resolve_host: IPv4 literal fast-path + getaddrinfo cold path
- io::connect(sock, host, port): blocking TCP connect by hostname
- pipe::accept_peer / run_accept for async ACCEPT via operator|
- Tests: mock accept, DNS resolve, acceptor + connect integration

Co-authored-by: Nikita <retretx@gmail.com>

- socket::connect_submission, pipe::connect_to / connect_host
- make_connect resolves host then stages CONNECT submission
- run_connect and connect_async poll for connect completion
- Tests: mock connect, accept+async connect integration (SKIP if unsupported)

Co-authored-by: Nikita <retretx@gmail.com>

- include/netlib/io/coro.hpp вне nostd modules: read/write/connect/accept awaitables
- sync_wait(io_context, io_task) с poll-драйвером для mock/io_uring
- NETLIB_ENABLE_COROUTINES по умолчанию ON при поддержке toolchain
- 4 теста в tests/v2/coro_tests.cpp (mock_engine)

Co-authored-by: Nikita <retretx@gmail.com>

- pipe: staged_handshake, run_handshake (accept+connect submit, joint poll)
- pipe: make_handshake, handshake_async(host) cold-path resolve
- coro: handshake_awaitable с session::handshake_wait и pump_handshake
- тесты mock + linux integration + coro handshake

Co-authored-by: Nikita <retretx@gmail.com>

- platform/windows: rio_engine (RIO probe, CQ create, software completion fallback)
- socket_winsock: tcp_socket, resolve, tcp_acceptor bind/listen
- connect.hpp + io_context platform alias for NETLIB_PLATFORM_WINDOWS
- CMake netlib::platform_rio (ws2_32, mswsock), tests/v2/rio_tests.cpp (WIN32)

Co-authored-by: Nikita <retretx@gmail.com>

…actor

- session::multi_wait заменяет handshake_wait (до 8 параллельных op)
- multi_op::descriptor для accept/connect/read/write
- when_all(ctx, op...) + when_all_result<N>
- handshake_awaitable построен поверх when_all_2
- тест parallel reads (4+8 bytes)

Co-authored-by: Nikita <retretx@gmail.com>

- parallel_op + parallel_slot_result (accept/connect/read/write)
- run_when_all(ctx, ops[N], out[N]) с poll_parallel
- run_handshake рефакторен через run_when_all
- тест parallel reads (4+8 bytes)

Co-authored-by: Nikita <retretx@gmail.com>

- Probe IORING_OP_CONNECT and registered I/O at engine open
- Fallback run_connect/run_handshake to blocking TCP when async connect unavailable
- blocking_connect temporarily clears O_NONBLOCK for libc connect on Linux
- pipe::parallel_op alias in coro multi_op; capability test + CI coroutines

Co-authored-by: Nikita <retretx@gmail.com>

…rts_async_connect

- connect_awaitable и handshake_awaitable делегируют blocking path
- Linux coro integration test с io_uring + blocking connect fallback

Co-authored-by: Nikita <retretx@gmail.com>

- resolve_submission: READ/WRITE_FIXED → READ/WRITE через buffer_registry при !supports_registered_io
- Пропуск io_uring_register_buffers если fixed ops недоступны
- buffer_registry::slice, pipe read_fixed_into/write_fixed_from + run_*_fixed
- Тесты: echo через fallback, invalid reg_index, pipe mock

Co-authored-by: Nikita <retretx@gmail.com>

- read_fixed_async / write_fixed_async поверх staged_read/write_fixed
- pipe staged_echo_fixed: read_fixed_into | echo_to + run_echo_fixed
- Тесты: mock pipe/coro, io_uring pipe echo через span fallback

Co-authored-by: Nikita <retretx@gmail.com>

…robe

- coro echo_fixed_async делегирует pipe::run_echo_fixed
- parallel_op/multi_op read_fixed/write_fixed для when_all
- Windows: RIOCreateRequestQueue при probe, request_queue_ready()
- Тесты: coro when_all fixed, pipe run_when_all fixed

Co-authored-by: Nikita <retretx@gmail.com>

- coro when_all read_fixed и echo_fixed_async на io_uring + span fallback
- Windows RIORegisterBuffer/RIODeregisterBuffer, registered_buffer_count()
- rio_tests: register_buffers через io_context

Co-authored-by: Nikita <retretx@gmail.com>

…n_all io_uring test

- session::sequential_step для цепочки read_fixed → write_fixed без sync run_echo_fixed
- pipe run_when_all parallel read_fixed на io_uring + span fallback

Co-authored-by: Nikita <retretx@gmail.com>

…helpers

- io_task_awaiter с continuation для вложенных coro-задач
- echo_async: sequential read→write через byte_stream
- detail::sequential_arm/finish — DRY для echo_fixed/echo
- Тесты: echo_async, nested io_task co_await

Co-authored-by: Nikita <retretx@gmail.com>

…ll stream reads

- coro: echo_async TCP + when_all stream reads на io_uring
- pipe: run_echo TCP + run_when_all stream reads на io_uring

Co-authored-by: Nikita <retretx@gmail.com>

- connect_host_awaitable / handshake_host_awaitable с cold-path resolve
- Тесты mock + io_uring handshake(host); coro:: квалификация vs pipe::
- CHANGELOG: coro layer, capability probe, span fallback, RIO, CI

Co-authored-by: Nikita <retretx@gmail.com>

- Rename pipe sync helpers to run_connect_host/run_handshake_host to avoid
  ambiguity with coro::connect_async/handshake_async
- Windows rio_engine: RIOReceive/RIOSend for registered fixed I/O, per-socket
  request queue pool, hybrid hardware/software poll
- Update docs/COROUTINES.md with v2 pipe/coro API section

Co-authored-by: Nikita <retretx@gmail.com>

- tcp_acceptor::bind_host + platform bind_ipv4 (Linux/Windows)
- pipe::run_accept_bind_host, coro::accept_bind_async
- detail::sequential_awaitable_base CRTP for echo awaitables
- Tests: bind_host, accept_bind_async; docs + CHANGELOG

Co-authored-by: Nikita <retretx@gmail.com>

- sequentialN_awaitable + sequential_chain builder (2..8 steps)
- echo_async/echo_fixed_async delegate to read_then_write_*
- commit_write_stream on sequential2 for stream echo semantics
- coro tests: 3-step chain, handshake after bind_host, when_all accept+connect

Co-authored-by: Nikita <retretx@gmail.com>

- coro::accept_connect_async with blocking-connect fallback (handshake delegate)
- pipe::run_accept_connect sync alias
- sequential_chain::defer_write_after_read for dynamic write after read
- docs/EXAMPLES.md v2 section; accept_connect io_uring integration test

Co-authored-by: Nikita <retretx@gmail.com>

io_context.hpp pulls io_uring/RIO engine headers on Linux/Windows; add the
same POSIX branch so v2_echo and coro.hpp see poll_engine via the include chain.

Co-authored-by: Nikita <retretx@gmail.com>

blocking_tcp_client_then_cancel used Windows path on Darwin; extend Linux
branch to NETLIB_PLATFORM_POSIX. Fix typo close_fd in posix_poll_tests.

Co-authored-by: Nikita <retretx@gmail.com>

Extend LINUX||WINDOWS blocking accept/connect/rw guards to POSIX and
enable would_block retry for poll_engine (fixes v2_echo smoke hang).

Co-authored-by: Nikita <retretx@gmail.com>

Raw read() on O_NONBLOCK client fd returns EAGAIN on Darwin before echo
reply is ready; blocking_read_some temporarily clears nonblocking.

Co-authored-by: Nikita <retretx@gmail.com>

Co-authored-by: Nikita <retretx@gmail.com>

- Extend v2_echo_bench for NETLIB_PLATFORM_POSIX (poll_engine)
- benchmarks/CMakeLists: Darwin backend alongside io_uring/RIO
- CI macOS: NETLIB_BUILD_BENCHMARKS + smoke v2_echo_bench 10 iters
- Docs: BENCHMARKS, PLATFORMS, CMAKE_OPTIONS, CHANGELOG

Co-authored-by: Nikita <retretx@gmail.com>

- op_kind recvfrom/sendto, peer_addr in submission, socket helpers
- udp_pipe.hpp: run_recvfrom, run_sendto, run_udp_echo
- socket_posix: udp_socket, blocking/nonblocking datagram I/O
- poll_engine: async recvfrom/sendto for live UDP sockets
- io_uring: blocking UDP syscalls in pipe (datagram sockets)
- tests/v2/udp_tests: mock + real loopback ping-pong
- examples/v2_udp_echo; CI smoke Linux gcc + macOS

Co-authored-by: Nikita <retretx@gmail.com>

Co-authored-by: Nikita <retretx@gmail.com>

- recvfrom_async, sendto_async, send_datagram_async, udp_echo_datagram_async
- blocking UDP fallback in await_suspend for io_uring and poll_engine
- fix double commit_read: blocking_recvfrom no longer commits (like blocking_read_some)
- coro tests: mock_engine recvfrom/sendto + real loopback udp_echo
- docs/COROUTINES.md: UDP awaitables table

Co-authored-by: Nikita <retretx@gmail.com>

- Delete .github/workflows/ci.yml
- scripts/ci.sh: configure, build, nostd gate, v2 smoke, ctest (gcc/clang/all)
- Docs: DEVELOPMENT, PLATFORMS, CMAKE_OPTIONS, TESTING, README, CHANGELOG

Co-authored-by: Nikita <retretx@gmail.com>

- socket_winsock: udp_socket, blocking_recvfrom/sendto, is_datagram_socket
- udp_pipe + coro: rio_engine blocking UDP (like io_uring on Linux)
- v2_udp_echo examples build on Windows (sync + coro)
- ci.sh: fuser cleanup before TCP smoke; docs/EXAMPLES, CHANGELOG

Co-authored-by: Nikita <retretx@gmail.com>

- rio_engine: software recvfrom/sendto + WSAPoll; hardware datagram via Ex APIs
- udp_socket: WSA_FLAG_REGISTERED_IO for RIO request queues
- Remove rio_engine blocking UDP bypass in udp_pipe/coro
- rio_tests + coro: UDP loopback via rio_engine
- docs: PLATFORMS, EXAMPLES, CHANGELOG

Co-authored-by: Nikita <retretx@gmail.com>

- io_uring_engine: prep_recvfrom/sendto with msghdr slots, probe supports_async_udp
- pack_user_data_slot for in-flight msg slot tracking
- Remove blocking UDP bypass from udp_pipe (all engines submit+poll)
- coro: blocking UDP only for macOS poll_engine
- uring_tests: RECVMSG/SENDMSG + run_udp_echo async path
- docs: PLATFORMS, EXAMPLES, CHANGELOG

Co-authored-by: Nikita <retretx@gmail.com>

Co-authored-by: Nikita <retretx@gmail.com>

Co-authored-by: Nikita <retretx@gmail.com>

Co-authored-by: Nikita <retretx@gmail.com>

Co-authored-by: Nikita <retretx@gmail.com>

Co-authored-by: Nikita <retretx@gmail.com>

Co-authored-by: Nikita <retretx@gmail.com>

Co-authored-by: Nikita <retretx@gmail.com>

Co-authored-by: Nikita <retretx@gmail.com>

Co-authored-by: Nikita <retretx@gmail.com>

Co-authored-by: Nikita <retretx@gmail.com>

Co-authored-by: Nikita <retretx@gmail.com>

Co-authored-by: Nikita <retretx@gmail.com>

Co-authored-by: Nikita <retretx@gmail.com>

Co-authored-by: Nikita <retretx@gmail.com>