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).

viewer/isokit-view.css

@@ -73,6 +73,12 @@
 .iso-svg .iso-r { fill: color-mix(in srgb, var(--b, #888) var(--iso-kr), var(--iso-shade)); }
 .iso-sprites path, .iso-sprites ellipse, .iso-sprites circle { stroke: var(--iso-edge); stroke-width: var(--iso-edgew); stroke-linejoin: round; }
 .iso-ground path, .iso-ground ellipse { stroke: none; }
+/* animals: each face edged in its own shade (no seams, no wireframe), so a body reads as one surface */
+.iso-sprites .iso-beast { stroke-width: .3; }
+.iso-sprites .iso-beast.iso-t { stroke: var(--b, #888); }
+.iso-sprites .iso-beast.iso-l { stroke: color-mix(in srgb, var(--b, #888) var(--iso-kl), var(--iso-shade)); }
+.iso-sprites .iso-beast.iso-c { stroke: color-mix(in srgb, var(--b, #888) var(--iso-kc), var(--iso-shade)); }
+.iso-sprites .iso-beast.iso-r { stroke: color-mix(in srgb, var(--b, #888) var(--iso-kr), var(--iso-shade)); }
 @supports not (color: color-mix(in srgb, red 50%, blue)) {
   .iso-svg .iso-l, .iso-svg .iso-c, .iso-svg .iso-r { fill: var(--b, #888); }
   .iso-svg .iso-r { fill-opacity: .82; }
@@ -126,6 +132,13 @@ html[data-theme=light] .iso-svg .iso-glint { display: inline; }
    unanimated (reduced motion, ghosted) only the first */
 .iso-svg .iso-flip { visibility: hidden; animation: iso-flip16 4s step-end infinite; }
 .iso-svg .iso-flip.iso-pose0 { visibility: visible; }
+/* animals: two poses taking turns (grazing, looking up; delays set the turn); unanimated the first.
+   Birds flap and butterflies flutter (wings scaled across their span); rabbits hop now and then */
+.iso-svg .iso-pose2 { visibility: hidden; animation: iso-pose2b 9s step-end infinite; }
+.iso-svg .iso-pose2.iso-pose0 { visibility: visible; animation-name: iso-pose2a; }
+.iso-svg .iso-flap { transform-box: fill-box; transform-origin: center; animation: iso-flap .8s ease-in-out infinite alternate; }
+.iso-svg .iso-flutter { transform-box: fill-box; transform-origin: center; animation: iso-flap .3s ease-in-out infinite alternate; }
+.iso-svg .iso-hop { animation: iso-hop 3.4s ease-out infinite; }
 .iso-svg .iso-park { display: none; }
 /* paused off-screen (iso-off), when stopped (iso-still), with animation off and during pan/zoom gestures */
 .iso-off .iso-a, .iso-still .iso-a, .iso-off .iso-drive, .iso-still .iso-drive, .iso-off .iso-ledr, .iso-off .iso-ledo, .iso-still .iso-ledr, .iso-still .iso-ledo,
@@ -147,6 +160,10 @@ html[data-theme=light] .iso-svg .iso-glint { display: inline; }
 @keyframes iso-fadeout { 0%, 65% { opacity: 1; } 100% { opacity: 0; } }
 @keyframes iso-fadeio { 0%, 100% { opacity: 0; } 30%, 70% { opacity: 1; } }
 @keyframes iso-flip16 { 0% { visibility: visible; } 6.25%, 100% { visibility: hidden; } }
+@keyframes iso-pose2a { 0% { visibility: visible; } 65%, 100% { visibility: hidden; } }
+@keyframes iso-pose2b { 0% { visibility: hidden; } 65%, 100% { visibility: visible; } }
+@keyframes iso-flap { from { transform: scaleX(1); } to { transform: scaleX(.25); } }
+@keyframes iso-hop { 0%, 70%, 100% { transform: translate(0, 0); } 78% { transform: translate(0, -4px); } 86% { transform: translate(0, 0); } 91% { transform: translate(0, -2px); } }
 @keyframes iso-ram { 0%, 20%, 100% { transform: translate(0, 0); } 45%, 55% { transform: translate(var(--dx), var(--dy)); } }
 @keyframes iso-move { from { transform: translate(0, 0); } to { transform: translate(var(--dx), var(--dy)); } }
 @keyframes iso-shuttle {