0.25.0

• Items left lying on the map. The item you replace is no longer thrown
  away if it was worth keeping: a unique always, or gear better than your own
  average, is left where you stood. Anyone who drifts within fifty squares
  takes it if it beats what they carry, leaving theirs in its place. Nothing
  is created - a dropped item was already in play - so this is never a second
  source of loot on top of level-ups. About seven items a week are worth
  leaving, 46% of them are found, and the map carries nought to three at a
  time; everything else is discarded exactly as before.
• The world map updates as you watch it. It swaps in a fresh map every
  fifteen seconds without reloading the page, and draws what is lying about,
  each marker naming the item's level, what it is and who left it.
• The realm is told what a new version brought, once, when it comes up on
  one: the headlines from this file and a link to the rest. A restart says
  nothing, and neither does a version it has already announced, so a crash
  loop cannot spam the channel.
• Measurement: no measurable cost to the realm's pace. Over eight seeds the
  difference against a control with pickups switched off is -0.6% +/- 1.6%,
  which does not clear zero. An earlier four-seed run suggested a 1.4% drag
  and did not survive four more seeds, one of which swung 4.3% the other way.
  Alignment spread sits inside the harness's noise at this sample size, and
  nothing in the rule looks at alignment.