election[j].userData; if(su.shape===abase && !!su.ghost===aghost) nm++; } codeStatus(selection.length+' connected · '+nm+' '+abase+(aghost?' ghost':'')+' — `swap
` restyles · `cut` removes · `keep` releases');
}
function swapSelection(code){
  if(!selection.length){ codeStatus('nothing selected'); return; }
  var key = codeToShapeKey(code);
  if(!key){ codeStatus('refused · unknown code'); return; }
  var nbase = shapeBase(key), nghost = shapeIsGhost(key);
  var au = selection[0].userData, abase = au.shape, aghost = !!au.ghost, n = 0;
  for(var i=0;i` again · `keep` releases');
}
function cutSelection(){
  if(!selection.length){ codeStatus('nothing selected'); return; }
  var st=[];
  for(var i=0;i10) undoStack.shift();
  saveUndo(); save(); updateAnchors();
  codeStatus(n+' cut');
}
function runOps(ops, mass){
  var raised=0, stepped=0, cleared=0, newGs=[];
  var runProc = null, bi;
  for(bi=0;bix1)x1=bo.x; if(bo.zz1)z1=bo.z; }
    var doomed = {};
    for(var s=0;s=x0 && st.position.x<=x1 && st.position.z>=z0 && st.position.z<=z1) doomed[sp]=1;
    }
    for(var dp in doomed){ pushUndo(dp, runProc); cleared += deleteProcedure(dp); }
  }
  for(var i=0;i stoneMass(e)){
          if(eu.proc){ pushUndo(eu.proc, null); cleared += deleteProcedure(eu.proc); }
          else { stones.remove(e); cleared++; }
        }else{ stepped++; continue; }
      }
    }
    var g = placeStone(o.x, o.z, o.size, o.shape, false, true, oy);
    if(g){ g.userData.proc = o.proc||null; g.userData.procMass = mass; raised++; newGs.push(g); }
  }
  save(); updateAnchors();
  if(newGs.length){ newGs.forEach(addSeamsFor); shareStones(newGs); }
  return {raised:raised, stepped:stepped, cleared:cleared};
}

/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
   MARK: HARDENING — so it never crashes
   validate first, build second · caps · bounds · finite numbers · fail soft.
   EDIT: the caps.
   ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ */
var HARDEN = {MAX_SIZE:200, MAX_REPEAT:64, MAX_OPS:500, MAX_DEPTH:8, BOUND:50};
function validateOps(ops){
  if(ops.length > HARDEN.MAX_OPS) return 'too many stones';
  for(var i=0;iHARDEN.BOUND || Math.abs(o.z)>HARDEN.BOUND) return 'beyond the map';
    if(o.remove) continue;
    if(!(o.size>=1 && o.size<=HARDEN.MAX_SIZE)) return 'size out of range';
    if(!((o.y||0)>=0 && (o.y||0)<=HARDEN.MAX_SIZE)) return 'height out of range';
    if(!o.shape) return 'no shape';
  }
  return null;
}

/* THE CREATOR HALL — Playa 2.0's Fix Station built into the world */
function buildCreatorHall(){
  try{
    var cx = 45, cz = 30; /* off zero lines, near city */
    var gy = 1500; /* HIGH IN THE SKY —