Jarvis: AI butler

Three separate abilities, deliberately kept apart, because only one of them costs anything and only one of them works at any distance.

Added — he notices portals A sweep for portal blocks while he is out with you, reusing the ore search's trick of snapshotting chunks on the main thread and reading them off it. Wide and shallow rather than the ore search's cube — a portal is a landmark you walk past, not a vein you dig down to. Skipped entirely when you have not moved. A sweep from a spot he has already swept finds what it found last time, so the loop's usual outcome is no work at all. Walking into one counts as a sighting, via PlayerPortalEvent. Nothing beats being told. He cannot see into unloaded chunks — no plugin can without forcing terrain to load, which would hitch the server — so a sweep reaches about as far as you can see. He says "none nearby", never "there are none". Added — he remembers them Sightings persist in data.yml beside your home, deposit chest and patrol routes. A frame is one portal, not six. Every block of the purple qualifies as a sighting, so anything within eight blocks of a known portal merges into it — and a merge keeps the original coordinates rather than letting a remembered portal wander a metre at a time. The list is bounded at twelve per player, oldest dropped, because this is a file that grows every time you walk past something and is read at every startup. Re-seeing a portal refreshes it, so the one you use daily outlives the one you glanced at once. /jarvis portals lists what he knows in this world, nearest first, with distance and bearing. Added — he does the arithmetic /jarvis portal where answers where a portal comes out on the other side. This needs no scan, no memory and no loaded chunks: the Overworld runs at eight times the Nether's scale, and the game links to any existing portal within 128 blocks of the scaled position before building a new one — which is why two portals close together in the Nether end up sharing an exit. Standing at a portal he knows, it describes that one; standing anywhere else, it answers "a portal here would come out at…", which is the same question asked before you have built it. Negative coordinates are the whole difficulty. Java's / truncates toward zero, so -1227 / 8 is -153 where the game floors to -154 — eight blocks out, in the wrong chunk, for every base west or north of spawn. Math.floorDiv throughout, and a test that pins exactly that case. Added — he leads the way /jarvis portal escorts you to the nearest one he knows, on the same legs, waiting and torch-lighting as /jarvis home. He leads you to a portal and no further. Citizens NPCs do not change dimension with you, so he says as much and waits on this side. Changed EscortService.takeHome is now one caller of a general escortTo(player, destination, departure, arrival, wrongWorld). The walk never cared where it was going. DepositManager gains a portal registry beside the home and patrol ones, and a portals section in data.yml. A sighting that merely refreshes a timestamp does not trigger a disk write; a new portal does.