fix: publish only ARM64 macOS and Windows

[freelw]

Summary

• remove the macOS Intel release target
• publish only macOS ARM64 and Windows x64 raw binaries
• update CI assertions, installers, README, and Skill guidance to enforce the two-platform contract

Why

GitHub retired the macos-13 runner image, which left the v0.1.0 Intel job queued without starting. Product direction is to drop that binary instead of migrating it to another Intel runner.

Validation

• workflow YAML parses successfully
• release matrix contains exactly 2 targets
• macOS Intel and Linux targets are absent

After merge, publish a new tag (for example v0.1.1); changing main does not alter the workflow snapshot attached to existing tag v0.1.0.