Piles near the bot sort, and 20 times faster; burning fuel keeps the slow pace (t21)

- SORTP 0.003 -> 0.06: ore sinks through 8 rows of ash in about 7 s near the bot.
- wakeBotPowder(): every 8 ticks, areas with loose grains within 100 grains of the bot get a
  sorting chance; far away, resting piles still sleep.
- Sinking through burning fuel stays at 0.003, so buried burning piles still char and furnace
  beds behave as tuned. World generation settles at the old rate: seeds are unchanged.

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

src/sim/tick.js

@@ -10,6 +10,7 @@ function simTick() {
   pulseTick();
   entTick();
   if (flyers.length) flyTick();
+  if (tick % 8 === 0) wakeBotPowder();
   simMove();
   heatPass();
   for (let c = 0; c < NCH; c++) if (awake[c]) awake[c]--;