Drill: visible dust; pulses push loose material back and open a channel (t92)

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

src/render/overlays.js

@@ -331,8 +331,13 @@ function drawBot() {
   ctx.beginPath(); ctx.moveTo(cx - bot.face * zp, sy + zp * 0.6 + bob); ctx.lineTo(cx - bot.face * zp * 1.6, sy - zp * 0.6 + bob); ctx.stroke();
   ctx.restore();
 }
-function spawnDebris(x, y, m) {
+function spawnDebris(x, y, m, dust = false) {
   if (!SET.particles || R.particles.length > 400) return;
+  if (dust) {
+    R.particles.push({ x: x + 0.5, y: y + 0.5, vx: (Math.random() - 0.5) * 0.12,
+      vy: -0.06 - Math.random() * 0.06, life: 36, r: 205, g: 190, b: 165, dust: true });
+    return;
+  }
   for (let k = 0; k < 2; k++) R.particles.push({ x: x + Math.random(), y: y + Math.random(), vx: (Math.random() - 0.5) * 0.5, vy: -Math.random() * 0.5, life: 20 + Math.random() * 20, r: COLR[m], g: COLG[m], b: COLB[m] });
 }
 function spawnSpark(x, y) {
@@ -358,11 +363,20 @@ function drawParticles() {
       p.x += dx / d * sp; p.y += dy / d * sp; p.life--;
       if (p.life <= 0) { ps.splice(k, 1); continue; }
     } else {
-      p.x += p.vx; p.y += p.vy; p.vy += 0.04; p.life--;
+      p.x += p.vx; p.y += p.vy; p.vy += p.dust ? 0 : 0.04; p.life--;
       if (p.life <= 0) { ps.splice(k, 1); continue; }
     }
     if (SET.fog && fogSeen(p.x, p.y) < 64) continue;
     const s = worldToScreenPx(p.x, p.y);
+    if (p.dust) {
+      const radius = zp * (1 + (36 - p.life) * 0.035);
+      const puff = ctx.createRadialGradient(s.x, s.y, 0, s.x, s.y, radius);
+      puff.addColorStop(0, `rgba(${p.r},${p.g},${p.b},${0.32 * p.life / 36})`);
+      puff.addColorStop(1, `rgba(${p.r},${p.g},${p.b},0)`);
+      ctx.fillStyle = puff;
+      ctx.fillRect(s.x - radius, s.y - radius, radius * 2, radius * 2);
+      continue;
+    }
     ctx.fillStyle = `rgba(${p.r | 0},${p.g | 0},${p.b | 0},${Math.min(1, p.life / 10)})`;
     const sz = p.spark ? Math.max(1, zp * 0.5) : p.suck ? zp : Math.max(1, zp * 0.7);
     ctx.fillRect(s.x, s.y, sz, sz);