Add macOS arm64 developer support

[huangminghuang]

Summary

Adds macOS Apple Silicon support for Wire Sysio, including the Release CI path, Apple arm64 dependency registry updates, macOS-safe CMake/runtime gates, native-debug host integration, and sys-vm-jit support on macOS arm64 through wire-sys-vm 1.2.0.

What changed

• Adds a macos-26 Apple Silicon workflow (macos_arm64_build.yaml) that configures a Release build, builds all, runs the parallelizable CTest set for PRs, pushes to master, and a nightly scheduled run on origin/master, and runs the sharded NP/LR sweep only on nightly schedule or explicit manual opt-in.
• Shares .github/scripts/build-sysio.sh between Linux and macOS CI by making the build directory, vcpkg triplets, compiler settings, and cache paths environment-driven while keeping Linux workspace ownership repair in the Linux workflow.
• Adds an arm64-osx-release vcpkg overlay triplet matching the Linux release-triplet pattern, including release-only vcpkg dependencies and ccache launchers.
• Pins wire-vcpkg-registry to a master commit containing the macOS-compatible Boost, SoftFloat, secp256k1, and wire-sys-vm 1.2.0 port updates, with wire-sys-vm pinned to eos-vm master including Fix Clang unroll warning in LEB128 helpers eos-vm#13.
• Enables sys-vm-jit by default for Apple arm64 builds while keeping x86-only profiling JIT support gated to x86_64.
• Gates Linux/x86-only behavior away from macOS, including linker flags, LLVM/OC assumptions, allocator defaults, and unsupported runtime paths.
• Defaults jemalloc off on macOS while preserving Linux defaults and sanitizer auto-disable behavior.
• Updates SoftFloat type handling and related serialization/precondition paths for Apple arm64 compatibility.
• Fixes AppleClang/libc++ gaps that remain on macOS 26, including missing std::views::enumerate, missing std::move_only_function, std::chrono::utc_clock usage, and time_t/fc::variant integer typing.
• Skips sys-vm-oc-only chain plugin tests when OC is not enabled.
• Enables macOS Debug native-module host support by allowing native-module on Apple Debug builds and generating Apple -exported_symbols_list files for native intrinsic exports.
• Documents macOS developer setup and native-debug behavior in README.md, AGENTS.md, CLAUDE.md, and contracts/native-debug.md.

Why

The repo could not reliably configure, build, or test on Apple Silicon because Linux linker flags, allocator assumptions, x86-only runtime assumptions, GNU/libstdc++ expectations, and pre-merged vcpkg registry gaps leaked into the macOS path.

This PR narrows the supported macOS CI path to an Apple Silicon Release build using checked-in contract artifacts, while enabling both interpreted sys-vm and plain sys-vm-jit on Apple arm64. Profiling JIT and OC remain gated to platforms that support them.

Testing

• ctest -R '^performance_test_basic_transfer_trx_spec$' --output-on-failure -V
• CI is the source of truth for full build/test status. The macOS workflow builds Release all and runs the parallelizable CTest set for PRs, pushes to master, and the nightly origin/master schedule. The macOS sharded NP/LR sweep is skipped for PRs and runs only on the nightly schedule or when manually dispatched with run_sharded_np_lr enabled. The Linux workflow keeps the existing amd64 matrix coverage.
• Locally validated macOS arm64 Release configure/build and representative runtime tests before moving that coverage into CI.
• Locally validated the Debug native-module path with native contract output from the paired CDT work, including native overlay and sysio.token contract tests.
• For the shared CI helper and workflow updates, validated bash -n .github/scripts/build-sysio.sh, YAML parsing for both workflows, and git diff --check.

Related PRs

• Add macOS arm64 native support wire-cdt#66 adds the CDT-side native contract compilation support needed to emit macOS Mach-O _native.so modules. This sysio PR consumes that capability for local Debug native-module loading and host intrinsic export support.

Notes

• macOS CI intentionally uses Release mode. The workflow is named macos_arm64_build.yaml because it builds all and runs parallelizable tests in automated CI. It does not build contracts through CDT and does not run native-module tests.
• The macOS nightly schedule runs at 08:00 UTC from the default branch, providing nightly coverage for origin/master after this workflow is merged.
• The macOS sharded NP/LR sweep is no longer part of PR CI; it runs on the nightly schedule and can also be requested manually with run_sharded_np_lr enabled.
• Local macOS Debug native contract debugging is in scope for this PR when paired with Add macOS arm64 native support wire-cdt#66: sysio enables native-module, exports host intrinsics with the macOS linker format, and documents the LLDB/native-module workflow.
• sys-vm-oc, CDT contract rebuilds in CI, and native-debug CI coverage remain out of scope for this PR.

E2E workflow

• E2E Flow Tests passed for wire-sysio branch feature/macos-arm64-support after merging origin/master.
• Completed at 2026-06-30T22:12:59Z: https://github.com/Wire-Network/wire-platform-build-system/actions/runs/28468688260