fix(windows): accept cross-mode rendezvous in the elevated recovery helper

[zackees]

Refs #1152 / meta #1149. Found during live hardware closeout: ShellExecuteExW drops the parent environment, so the elevated helper resolved the prod fbuild root while the dev-mode CLI created its rendezvous under the dev root — path validation failed and the helper exited without a result. Accept either mode's rendezvous dir (both fbuild-owned per-user private dirs; injection guarantee unchanged) and include the helper exit code in the no-result diagnostic. 10 usb_recovery CLI tests pass incl. new cross-mode case.

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• crates/fbuild-cli/src/cli/usb_recovery.rs

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