WIP: hack at std.Io on a plane

WIP land the std.Io interface

std.Io.net.HostName: implement DNS name expansion

std.Io.net.HostName: implement DNS reply parsing

std.Io.Threaded.netReceive: recvmsg first, then poll

std.Io.net: implement receiving connectionless messages

std: fix msghdr and cmsghdr when using musl libc

std.Io: implement netSend

std.os.linux: remove unnecessary warnings from sendmmsg

std.os.linux: remove sendmmsg workaround

std.Io.net: make netSend support multiple messages

std.Io.net.HostName: finish implementing DNS lookup

std.Io.Threaded: implement Group.cancel

std.Io: implement Group API

std.Thread.ResetEvent: make it more reusable

std.Io: rename asyncConcurrent to concurrent

Io.net: implement more networking

std.Io.net: progress towards DNS resolution

std.net: fix parsing IPv6 addr "::"

Io.net: finish implementing IPv6 parsing

Io.net: use resolve for IPv6

Io.net: rework IPv6 parsing and printing

std.Io: rename ThreadPool to Threaded

std.Io: extract Dir to separate file

Io.net: partial implementation of dns lookup

Io.net: implement sortLookupResults

std: start moving fs.File to Io

std.Io.net: partially implement HostName.lookup

add some networking

add std.testing.io

std.Io: delete asyncParallel

std.Io: fix error handling and asyncParallel docs

std.Io: add asyncConcurrent and asyncParallel

std.Io.EventLoop: add aarch64 support

std.Io.ThreadPool: fix asyncDetached

std.Io: rename go to asyncDetached

revert std.Thread.Pool for now

update to sync with master

Io: update for new linked list API

std.Io: remove `@ptrCast` workarounds

std.Io.EventLoop: implement select

Io.EventLoop: select stub

introduce Io.select and implement it in thread pool

Io.Condition: implement full API

EventLoop: implement detached fibers

EventLoop: let the allocator do its job

EventLoop: fix `std.Io.Condition` implementation

EventLoop: revert incorrect optimization

EventLoop: remove broken mechanism for making deinit block on detached

std.Io.Condition: change primitive to support only one

EventLoop: take DetachedClosure into account when allocating

EventLoop: implement detached async

Io: implement faster mutex

std.Io: add detached async

implement Mutex, Condition, and Queue

Io: implement sleep and fix cancel bugs

EventLoop: implement thread-local queues and cancellation

std.Io: introduce cancellation

better API for Io.async

EventLoop: fix futex usage

EventLoop: get file operations working

WIP

start adding fs functions to std.Io

free freeing wrong amount in thread pool impl

EventLoop: move context after the async closure

EventLoop: fix incorrect alignment panic

update threaded fibers impl to actually storing args

fix context passing in threaded Io impl

EventLoop: implement main idle fiber

EventLoop: add threads

EventLoop: rewrite context switching

EventLoop: prepare for threading

demo: single-threaded green threads implementation

make thread pool satisfy async/await interface

introduce std.Io interface

Merge pull request #25705 from squeek502/linked-list-remove-docs

Elf2: set ELFOSABI_OPENBSD for openbsd

Elf2: set ELFOSABI_FREEBSD for ps4

std.Target.aarch64: updates for LLVM 21.1.5

Zcu: use shortest reference trace

std.heap.debug_allocator outdated doc (#25634)

spirv: fix airWorkGroupSize to use workgroup_size builtin

Merge pull request #25691 from GasInfinity-Forks/x86_16-gcc

Fix stale reference bug in `std.zig.system.resolveTargetQuery` (#25713)

remove all Oracle Solaris support

Revert "std.Target: xtensa defaults to windowed ABI"

test: enable tsan standalone test for x86_64-freebsd and aarch64-freebsd

tsan: fix cross build for FreeBSD by using direct syscalls instead of libsys

Compilation: define __illumos__ for C/C++ when targeting illumos

std.debug.cpu_context: fix mcontext alignment for x86_64-illumos

docs: fix handle_error_with_catch_block typo

fix `std.fs.path.resolveWindows` on UNC paths with mixed path separators

Merge pull request #25700 from alexrp/solaris-illumos-stuff

llvm: remove some workarounds in loadTruncate()

std.heap: define page size for alpha-netbsd

Merge pull request #25640 from alexrp/std-target-more-arches

spir-v: Fix .storage_buffer pointer indexing

std.Target: bump min-max versions for OpenBSD from 7.6-7.7 to 7.7-7.8

std.mem.Allocator: fix resize doc comment

std.{c,posix}: add getgid and getegid