Reset shell command hash in spinner and make sleep resilient to shells without redirected sleep, preventing stale PATH lookups and failures in background subshells. Improve Gentoo bootstrap by syncing portage (emerge-webrsync or emerge --sync), preferring binary packages (--getbinpkg --usepkg) before falling back to source emerge, and add a fallback fetcher: prefer curl but use wget if curl is unavailable; fail with a clear error if neither is present. Replace direct curl sourcing with a configurable _fetch command to support the wget fallback.
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