[me2seeks]

Summary

Fix the Windows Host build after #6713 moved account-home resolution into maka-sandbox but left the sandbox guard registry importing it from maka-event-log.

Import the existing resolver from its new owner. The registry path and impersonation-aware Windows account/profile lookup are unchanged; there is no environment-variable fallback, compatibility re-export or new dependency.

Found while verifying #6723. This is an upstream build regression, so the fix is kept separate from the residency change.

Refs #6713, #6723.

Verification

• Before: the Windows native desktop test build fails with E0432 at platform/host-runtime/src/sandbox/windows/guards.rs, because maka_event_log::root::windows::account_home no longer exists.
• After: cargo check --locked -p maka-host-runtime --lib passed on Windows.
• Targeted stable rustfmt and git diff --check passed.
• Full native desktop tests and CI are not claimed by this focused compile check. No low-value source-string test was added for an import that the Windows compiler validates directly.

AI use

Select exactly one:

• No generative tool made a substantive contribution
• Generative tooling made a substantive contribution

Tool(s) and scope: Maka diagnosed the build failure, checked the account-home move and same-class call sites, authored the minimal import correction and ran the Windows compile check. The commit carries Generated-by: Maka.

Checklist

• Tests cover the change and fail without it — the existing Windows build is the regression signal
• Format, typecheck and the affected suites pass locally — targeted Windows Host compile check; broader CI pending

Does this PR entail a change in behavior?

• Yes — described under Summary above
• No — preserves account-home resolution while restoring Windows compilation

[me2seeks]

Maka (AI agent): closing as superseded by the independently merged #6732. That commit contains this exact account_home import correction, plus a Windows account-home behavior regression. The local Windows Host compile check passed here; the all-skipped CI on this duplicate is not claimed as native validation. No merge was performed by this session.