Review findings on #110914 (@ehz0ah): the psutil leg compared watched
abspath against the kernel-resolved path psutil reports, so a symlinked
HERMES_HOME on macOS returned no holders and let the fallback probe mint
replacement sidecars under a live writer. Both sides now realpath.
doctor's `file:{path}?mode=ro` truncated at '?'/'#' in a home name;
build the URI with as_uri().
9b419a2d3c