Each land's set pieces from its data: the barrow, the standing stones and the bear are the Valley's alone, the Cove keeps its wolves; the Cove's 0.6.0 plan (treasure: one each, each in its own place)

docs/WORLDLETS_DESIGN.md

@@ -283,6 +283,46 @@ The steps:
 - Later: tides (sea level shifting slowly), a raft or rowing boat, and
   driftwood on the beach.
 
+### The Cove's own dangers and the pirate treasure (Paul, Nov 2026, for 0.6.0)
+Paused at the Cove for a playtest before the Highlands. The Cove gets its
+own set pieces instead of copies of the Valley's:
+- **Set pieces per land**, listed in each worldlet's data (`"places"`). The
+  Valley keeps the wolf den, the barrow, the standing stones (the Old Stag)
+  and the bear; the Cove keeps the wolves only, and gets the wreck and the
+  treasure.
+- **The wreck:** a beached ship on the rocks at the far end of the bay, its
+  timbers along the sand (driftwood). Its captain's sea chest: some nails,
+  rope, coins and a **torn treasure map**.
+- **The map:** reading it puts an X on your N map: a mound of loose earth
+  by a marker stone in the Cove's hills (your own spot: see below).
+- **The dig:** a pickaxe, many blows, turns up the **pirate chest**: a
+  **ship's compass** (what the boat will need to sail to the Highlands: the
+  next crossing's gate, J2), a **spyglass** (zooms your view while held),
+  **pirate gold**, and a **cutlass** (quick, harder-hitting than the iron
+  spear).
+- **One treasure each, each in its own place** (online too): the wreck's
+  chest gives each player their own map, once, and each map's X is
+  somewhere different: picked from the world's seed and the player's id
+  (so it's fixed for them), among dry, gentle spots in the Cove's hills
+  away from the other places. You only see your own mound; the server knows
+  every player's spot and what each has found, and checks the right one
+  when you dig.
+- **Gold** is a **trophy you can place** in your hut (a heap of coins) for
+  now; what else it's for waits until there's a trader.
+- **The drowned crew:** the treasure's guards (the Cove's barrow guards).
+  Two or three rise from the shallows round the dig at night, or as the
+  chest comes up, for whoever's digging. Slow, hit hard, unafraid of fire,
+  they drag at you in the water.
+- **Crabs** on the beach at dusk (pinch if trodden on; food), and **gulls**,
+  thieves like the crows (fish off drying racks, things dropped on sand).
+- **The boat** (J2's first part): driftwood, seagrass rope and pitch (pine
+  resin and salt), at a workbench, placed at the pier. One each, moored,
+  yours and your friends'. Setting sail says the Highlands are uncharted
+  for now.
+- **Report a bug** in the pause menu, and a short playtest guide.
+- Order: set pieces per land, the wreck and map, the dig and the drowned
+  crew, crabs and gulls, the boat, report a bug; then 0.6.0 (protocol 18).
+
 ## 6. Done already (groundwork)
 - `world.water_at(x, z)` returns `{type, surface, depth}` for the lake and
   the sea, and fishing uses it instead of `terrain.water_level`.