* fix(windows): stop synchronous powershell ACL spawns blocking the main thread
markEnvironmentUsed re-hardened the env-store on every runtime round-trip,
spawning powershell.exe ~5x synchronously (~1-1.5s each) and freezing the
Windows UI on launch and every keystroke. Throttle the non-security lastUsedAt
write (60s window; runtimeId changes bypass) and make path hardening idempotent
per process. ACL hardening is preserved; post-rename credential hardening still
always runs. ~14.0s -> ~6.8s launch; main thread 95.7% blocked -> 99.0% idle.
* Fix secure-file hardening cache retries
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Co-authored-by: Jinwoo Hong <73622457+Jinwoo-H@users.noreply.github.com>