Wildlife and nature: animals, beehives, bushes, flowers, rocks, logs

New stdlib module wildlife.rhai:
- Animals (new palette category): Deer (stag with antlers, does, fawns),
  Wild boar, Fox, Elephant (bull with tusks, cow, calf), Rabbits. Low-poly
  solids from faces (loft, tube), parts drawn back to front by depth, faces
  edged in their own shade (class beast). Herds scatter round a spot, each
  animal its own sprite facing about the object's rotation. Grazing
  animals switch between two head poses (iso-pose2 groups), elephants curl
  their trunks, rabbits hop.
- Birds and Butterflies as flocks: swim() takes a shape (bird, fly, bee);
  wings flap out of step. Fish output unchanged.
- Beehives on stands with supers, lids, entrances and bees flying round;
  Bush (round, flowering, berries); Flowers (bed in rows or meadow); Rocks;
  Log or stump. g-meadow and g-soil ground materials.
- polyline() takes 3D points as documented (antlers).

Theme colours for dark and light, viewer CSS for poses, flapping, hopping.
examples/country: elephants in a paddock with a cut corner, deer at a
forest edge, boar, fox, rabbits, an apiary by a meadow, a pond, a lane,
fence and hedgerow at angles; Country demo in the web Studio and deploy.
MCP guidance, README, SCRIPTING, ROADMAP.

Tests: Rust 78, Studio 122; existing examples draw the same (only the
embedded theme CSS grew).

tools/check_studio.py

@@ -555,6 +555,28 @@ with sync_playwright() as p:
         pg.wait_for_timeout(700)
     check(len(doc()["objects"]) == n5, "four undos take the diagonals back")
 
+    # animals and an apiary from the palette: a deer herd grazes, the hives get bees
+    pal = pg.evaluate("() => [...document.querySelectorAll('.st-cat')].map(e => e.dataset.cat)")
+    check("Animals" in pal, "the palette has an Animals category")
+    pg.locator('.st-tile[data-type="deer"]').click()
+    pg.mouse.click(*at(44, 28))
+    pg.wait_for_timeout(900)
+    deer = doc()["objects"][-1]
+    pg.locator('.st-tile[data-type="beehive"]').click()
+    pg.mouse.click(*at(52, 18))
+    pg.wait_for_timeout(900)
+    hives = doc()["objects"][-1]
+    grazing = pg.evaluate(f"() => document.querySelectorAll('[data-obj=\"{deer['id']}\"] .iso-pose2.iso-pose0').length")
+    bees = pg.evaluate(f"() => document.querySelectorAll('[data-obj=\"{hives['id']}\"] .iso-bee').length")
+    herd = pg.evaluate(f"() => Object.fromEntries((__studio.view.info('{deer['id']}') || {{rows: []}}).rows)['Herd'] || ''")
+    check(deer["type"] == "deer" and hives["type"] == "beehive" and grazing == 4 and bees == 24 and herd == "1 stag, 2 does, 1 fawn",
+          f"a deer herd and beehives placed from the palette: {grazing} grazing, {bees} bees, herd {herd}")
+    pg.screenshot(path=str(OUT / "studio-wildlife.jpg"), type="jpeg", quality=80)
+    for _ in range(2):
+        pg.locator("#undo").click()
+        pg.wait_for_timeout(700)
+    check(len(doc()["objects"]) == n5, "two undos take the animals back")
+
     # an agent edits over MCP: the open Studio follows
     init = mcp({"jsonrpc": "2.0", "id": 1, "method": "initialize", "params": {"protocolVersion": "2025-06-18", "capabilities": {}, "clientInfo": {"name": "test", "version": "0"}}})
     check(init["result"]["serverInfo"]["name"] == "isokit", "MCP initialize")