fix: drop Windows support; recommend WSL

[yordis]

• Maintaining a Windows build path forced us to carry parallel filesystem fallbacks (.workspace-ref, copy_skill_tree-as-symlink) and a degraded is_executable that never matched what Unix users rely on — paying that cost on every new feature isn't worth it when WSL2 already runs a real Linux kernel.
• A compile_error! on non-Unix targets makes the policy explicit at build time; the README disclaimer points Windows users at WSL.

[cursor]

PR Summary

Medium Risk
Policy and packaging change plus removal of Windows code paths; low runtime risk on supported platforms, but Windows/native MSVC consumers lose official binaries and must use WSL.

Overview
This PR drops native Windows support for trg and documents Linux/macOS only, with Windows users directed to WSL.

A compile_error! on non-Unix targets in lib.rs fails the build on Windows instead of shipping degraded behavior. crates/trg/README.md states the platform policy and WSL guidance; Cargo.toml wires that file as the crate readme.

Release CI no longer builds or packages x86_64-pc-windows-msvc (matrix entry, zip packaging, and archive flags removed). Unix release tarballs now bundle crates/trg/README.md instead of the repo root README.

Unix-only paths replace #[cfg(unix)] / #[cfg(not(unix))] branches: docs mirror layout always uses symlinks with .workspace-ref on failure; eval workspaces symlink skills (no Windows copy fallback); runner discovery checks executable bits via Unix permissions. Tests assume symlinks and chmod without platform guards.

^{Reviewed by Cursor Bugbot for commit 61869ff. Bugbot is set up for automated code reviews on this repo. Configure here.}

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📥 Commits

Reviewing files that changed from the base of the PR and between bf53675 and 61869ff.

📒 Files selected for processing (9)

• .github/workflows/release-artifacts.yml
• crates/trg/Cargo.toml
• crates/trg/README.md
• crates/trg/src/agentskills/grading.rs
• crates/trg/src/agentskills/layout.rs
• crates/trg/src/agentskills/runner/availability.rs
• crates/trg/src/agentskills/runner/mod.rs
• crates/trg/src/commands/ai/skills/eval/grade.rs
• crates/trg/src/lib.rs

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• Create PR with unit tests
• Commit unit tests in branch yordis/chore-drop-windows-support

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[yordis]

for everyone wonder in the future, sorry, I don't have a Window computer since 2013, and with WSL, you can get the benefits as well.
I do not have interest to sunk time into maintaining Windows by now.