sanitychecks: probe libfuse3 via dlopen, accept .so.4

Fedora 44 and Arch ship libfuse3.so.4; the static path list only checked
.so.3 / unversioned .so, so the sanity check warned "libfuse3 not found"
on systems where FUSE actually works.

Use dlopen() with RTLD_NOLOAD then RTLD_LAZY against libfuse3.so.{4,3,}
so the dynamic loader resolves through /etc/ld.so.cache and picks up any
SOVERSION the distro ships. Fallback path list extended with .so.4 for
sandboxes that block dlopen.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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