Draw an additional directional glyph in each output port's target cell while in builder mode, previewing where the port's output will go (mirroring the surface-mask indicator position). Excludes the Tunnel Entry, which receives items from any non-mouth edge. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Y7N59FsLA5e2kuVdqe4Uhc