Public Access
The chip derivation was TrimEnd(separator), which is a name only for the Windows drives it was written against: on Unix it made the / chip an empty pill and the home chip the entire home path, drawn at full width in a header column nothing bounds. A home directory deep enough — CI's per-job HOME is forty-six characters — had that one chip walk the header's own buttons out of the window at the session shell's 472-pixel budget, which is the half of the runner's red suite the star-column fix before this one did not reach. A chip says C:, /, ~, or a mount's last segment now; the full path stays on its command parameter, where length costs nothing. RootChipNameTests pins the derivation with fixed strings, so it no longer takes a machine with a deep profile path to ask the question.