Codex review of the bot_prefix fix; these helper defects only mattered once traces reached the graph.
- Our own trace also confirms the bot -> first hop link, which was missing. Edges follow the chain bot -> h1 ... hn -> bot with 1-based hop positions in path order, as the message path writer numbers them (they were reversed).
- A public key is stored only when its prefix belongs to one recent repeater. The location lookup still picks a position for the distance, but its pick among colliding prefixes no longer becomes the stored key (also in the one-hop case).
- bot_prefix reads the radio's current key on each access, so reconnecting or rebooting into another radio is picked up.
- extract_repeater_prefixes_from_path no longer drops a last hop equal to our prefix: a companion never forwards, so it is a repeater sharing our short prefix. On dev bot_prefix was always None, so this keeps the attribution dev already had.