docs(windows): add git-bash/MSYS2 (Cygwin) incompatibility note to WINDOWS-GUIDE

[0xReSan]

Adds a trade-off note to WINDOWS-GUIDE (EN + ZH) documenting that the Windows sandbox targets native binaries, and that MSYS2/Cygwin runtimes (git-bash) cannot initialize under the RestrictedToken backend (CreateFileMapping of the user-SID shared-memory object denied), which breaks Hermes tools (write_file / terminal / execute_code) routed through git-bash. References upstream issue #29. Includes the ProjFS install command note from the earlier commit on this branch.

[github-actions]

Thanks for the contribution!

This repository is a release mirror — end-user docs are authored upstream in docs/public-finsafe/ and synced to finogeeks/finsafe on each public release. We do not merge PRs here as the long-term fix; maintainers cherry-port substantive edits upstream and close this PR with a link to the upstream change.

Your PR touches documentation / examples only, so it may be labeled triage:docs-only. A maintainer will review and port it when convenient; the update will appear on public main after the next release sync (or a manual docs push).

• CONTRIBUTING.md
• For bugs in finsafe behavior, please also consider opening an issue with the bug label so release automation can link a fix version.

[Geeksfino]

Thanks — cherry-ported upstream into Geeksfino/finsafe docs/public-finsafe/ and published to this mirror via docs-only sync (no new CLI release).

• Upstream: https://github.com/Geeksfino/finsafe/commit/ca867d3
• Public sync: 5fed704

Closing this PR per CONTRIBUTING (mirror PRs are not merged directly). The WINDOWS-GUIDE note is now on main here.

[Geeksfino]

Closed: docs live on main via upstream port (see previous comment).