Bag: rock goes in as rubble, older saves convert, list shows everything held

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

src/sim/save.js

@@ -117,6 +117,8 @@ function deserializeWorld(meta, buffers) {
   bot.x = meta.bot.x; bot.y = meta.bot.y; bot.lamp = meta.bot.lamp !== false; bot.vx = bot.vy = 0;
   bag = new Int32Array(NMAT); meta.bag.forEach((v, k) => { if (k < NMAT) bag[k] = v; });
   for (const m of meta.flyers || []) if (m < NMAT) bag[m]++; // grains that were mid-air when saved
+  // solids saved in the bag (older saves) come back as what drilling them gives
+  for (let k = 0; k < NMAT; k++) if (bag[k] && PH[k] === PH_SOLID && YLD[k]) { bag[YLD[k]] += bag[k]; bag[k] = 0; }
   bagTotal = 0; for (let k = 0; k < NMAT; k++) bagTotal += bag[k];
   Object.assign(player, meta.player);
   seen = new Uint8Array(NMAT); meta.seen.forEach((v, k) => { if (k < NMAT) seen[k] = v; });