When using gastown/max style paths, resolvePathToSession was treating
all non-role names as polecats, generating gt-gastown-max instead of
gt-gastown-crew-max.
Now checks if <townRoot>/<rig>/crew/<name> exists before defaulting
to polecat format. This fixes gt sling to crew members using the
shorthand rig/name syntax.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>