Mob Conduit

Bug fixes from a full review of the multi-loader tree, verified end-to-end against real Fabric, NeoForge and Paper servers running the packaged jar.

• Conduits survive a clean shutdown. Server teardown ran before the world save and emptied the conduit list first, so a conduit built since the last autosave was erased from saved data on /stop. In play the conduit re-derived itself from its crystal and frame within two seconds of the chunk loading, so this was invisible — but the saved state was wrong.
• /mobconduit visualize draws the coverage sphere. Two of its three rings were collapsing into diagonal lines, and the one real ring was too sparse to see at a 128-block radius. All three are now true great circles, drawn together, with spacing that scales with the radius.
• Config keys set to null in the JSON are reachable again. They vanished from get, set and tab-completion, and disappeared from the file on the next save. Any nulled key now falls back to its documented default.
• Disabling a dimension no longer strands a light block and a hologram on a conduit whose chunk was unloaded at the time.
• Paper / Spigot: crystals are detected however they arrive. Only crystals a player placed by hand were tracked, so one summoned by a command, another plugin or a structure never formed a conduit until its chunk cycled.
• Paper / Spigot: the plugin now loads through plugin.yml on both platforms. No change to how you use it.
• Cancelled world unloads are honoured; repeat visualize calls no longer stack; a mob caught by two overlapping conduits is only condemned once; the NeoForge build ships its icon.

Server-side only, nothing registered, vanilla clients just connect. Minecraft 26.2, Java 25.