Remove the Refiner and Stone cutter; old saves refund them on load (t4)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/sim/machines.js

@@ -76,9 +76,6 @@ function machineFootprint(type, x, y) {
     }
   } else if (type === 'fan') {
     for (let dy = 0; dy < 4; dy++) for (let dx = 0; dx < 4; dx++) out.push([x + dx, y + dy, 'hull']);
-  } else if (type === 'cutter') {
-    // a hopper 4 grains wide over the saw floor; bricks drop out underneath
-    for (let dy = 0; dy < 8; dy++) for (let dx = 0; dx < 8; dx++) out.push([x + dx, y + dy, dx < 2 || dx >= 6 || dy >= 5 ? 'hull' : 'void']);
   } else if (type === 'silo') {
     // roof with a hatch, the body, a cone narrowing to the gate, and two legs; the gaps beside
     // the cone are left open
@@ -92,9 +89,6 @@ function machineFootprint(type, x, y) {
       else k = dx >= 4 && dx <= 7 ? 'void' : dx === 3 || dx === 8 ? 'hull' : null; // the gate
       if (k) out.push([x + dx, y + dy, k]);
     }
-  } else if (type === 'refiner') {
-    // an open hopper 8 grains wide over the grinding floor; what it lets out drops from under the floor
-    for (let dy = 0; dy < 12; dy++) for (let dx = 0; dx < 12; dx++) out.push([x + dx, y + dy, dx < 2 || dx >= 10 || dy >= 10 ? 'hull' : 'void']);
   } else if (type === 'dock') {
     // an open-topped hopper: 2-grain walls and floor around a 20x14 bin
     for (let dy = 0; dy < 16; dy++) for (let dx = 0; dx < 24; dx++) out.push([x + dx, y + dy, dx < 2 || dx >= 22 || dy >= 14 ? 'hull' : 'void']);