Resonance ping: right click with the drill lights up nearby veins through fog (t50)

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

src/sim/drill.js

@@ -159,3 +159,19 @@ function pulseTick() {
   }
   drillPulses = drillPulses.filter(p => p.r < p.range + 3);
 }
+// Resonance ping (t50): an echo from the bot that finds ore veins in the rock around it, under
+// fog too. Reach grows with the bit. Only reads the world; the UI draws the echo.
+const PING_VEINS = new Uint8Array(NMAT); for (const m of [COALV, CUV, FEV, SNV, ZNV, AGV, AUV]) PING_VEINS[m] = 1;
+function pingRadius() { return BIT_TIERS[player.bitTier].reach * 3; }
+// Natural vein cells within r of (cx, cy), and the materials found.
+function resonancePing(cx, cy, r = pingRadius()) {
+  const cells = [], found = new Set(), r2 = r * r;
+  const x0 = Math.max(0, Math.floor(cx - r)), x1 = Math.min(W - 1, Math.ceil(cx + r));
+  const y0 = Math.max(0, Math.floor(cy - r)), y1 = Math.min(H - 1, Math.ceil(cy + r));
+  for (let y = y0; y <= y1; y++) for (let x = x0; x <= x1; x++) {
+    const dx = x - cx, dy = y - cy, i = y * W + x, m = mat[i];
+    if (dx * dx + dy * dy > r2 || !PING_VEINS[m] || !(flags[i] & F_NAT)) continue;
+    cells.push(i); found.add(m);
+  }
+  return { cells, found: [...found], r, x: cx, y: cy };
+}