<!-- SOLID CITY · part 1562 -->
 * Math.min(1, dt * 10);
    P.walk = (P.walk || 0) + dt * sp * 1.4;
  }
  if (S.ai) { // Hyper Controller AI walk: user input always wins
    if (mag > 0.08) S.ai(null);
    else { var st = S.ai(dt); if (st) { P.x += st.vx * dt; P.z += st.vz * dt; var wa = Math.atan2(st.vx, st.vz), da = ((wa - P.face + Math.PI * 3) % (Math.PI * 2)) - Math.PI; P.face += da * Math.min(1, dt * 8); P.walk = (P.walk || 0) + dt * st.sp * 1.1; mag = 1; } }
  }
  // everything visible is solid
  collideXZ(P, 0.45, P.y + 1);
  var sx = SABLE_POS.x - P.x, sz = SABLE_POS.z - P.z, sd = Math.hypot(sx, sz); if (sd < 1.3 && sd > 0) { P.x = SABLE_POS.x - sx / sd * 1.3; P.z = SABLE_POS.z - sz / sd * 1.3; }
  var gy = groundAt(P.x, P.z); if (gy < 0.5) { gy = 0.5; } // wading at the shore, no deeper
  if (window.CityForge) { var fy = CityForge.standY(P.x, P.z, P.y); if (fy > gy) gy = fy; }   // stand on Forge pieces (steps, slabs)
  if (window.CityAncestorRoads && CityAncestorRoads.topY) { var ap = CityAncestorRoads.pos; if (Math.hypot(P.x - ap.x, P.z - ap.z) < 560) { var ay = CityAncestorRoads.topY(); if (ay > gy) gy = ay; } }   // stand on the Ancestral Roads terrace
  if (window.CityVillageMauna && CityVillageMauna.standY) { var vy = CityVillageMauna.standY(P.x, P.z); if (vy > gy) gy = vy; }   // stand on Kauhale Mauna terraces
  if (window.CityTunnelBore && CityTunnelBore.standY) { var ty = CityTunnelBore.standY(P.x, P.z); if (ty > gy) gy = ty; }   // stand on the Bore floor
  if (window.CityStarwell && CityStarwell.standY) { var wy = CityStarwell.standY(P.x, P.z); if (wy > gy) gy = wy; }   // stand on the Starwell floor
  if (window.CityHyperTrain && CityHyperTrain.standY) { var hy = CityHyperTrain.standY(P.x, P.z); if (hy > gy) gy = hy; }   // stand on train platforms
  if (window.CityHyperCity && CityHyperCity.standY) { var hcy = CityHyperCity.standY(P.x, P.z); if (hcy > gy) gy = hcy; }   // stand on hyper building floors
  if (window.CityAnnex && CityAnnex.standY) { var any = CityAnnex.standY(P.x, P.z); if (any > gy) gy = any; }   // stand on the Annex floors
  if (window.CityQuadrantCrown && CityQuadrantCrown.standY) { var qcy = CityQuadrantCrown.standY(P.x, P.z); if (qcy > gy) gy = qcy; }   // stand on Quadrant Crown floors
  if (window.CityImperialColosseum && CityImperialColosseum.pos) { var cp = CityImperialColosseum.pos; if (Math.hypot(P.x - cp.x, P.z - cp.z) < 290) { var cy = (function(){ try { return CityImperialColosseum.group().position.y + 2; } catch(e){ return -1000; } })(); if (cy > gy) gy = cy; } }   // stand on the Imperial Colosseum terrace
  if (gy < 1 && heightAt(P.x, P.z) < -1.5) { P.x -= (P.x - (P.lx || P.x)); P.z -= (P.z - (P.lz || P.z)); gy = groundAt(P.x, P.z); help('The sea is too deep to walk — take a ship from the spaceport.', 3); }
  P.lx = P.x; P.lz = P.z;
  P.y += (gy - P.y) * Math.min(1, dt * 12);
  if (P.y < Y0 + 0.5 && Math.hypot(P.x, P.z) < 800 && gy < Y0 + 0.05) P.y = Y0 + (Math.hypot(P.x, P.z) < 110 ? 0.12 : 0.02);
  avatar.rotation.y = P.face;
  var sw = Math.sin(P.walk || 0) * (mag > 0.08 ? 0.5 : 0);
  avatar.children.forEach(function (c) { if (c.name === 'leg1' || c.name === 'arm-1') c.rotation.x = sw; if (c.name === 'leg-1' || c.name === 'arm1') c.rotation.x = -sw; });
  // context action
  actTarget = null;
  var dS = Math.hypot(P.x - SABLE_POS.x, P.z - SABLE_POS.z);
  if (dS < 7) actTarget = { kind: 'sable', label: 'TALK TO SABLE' };
  if (!actTarget && Math.hypot(P.x - SOUL.door.x, P.z - SOUL.door.z) < 8) actTarget = { kind: 'soul', label: 'ENTER SOUL PRINT TOWER' };
  if (!actTarget && window.CitySanctuary && window.CityCitizens && CitySanctuary.talkHere(P.x, P.z)) actTarget = { kind: 'citizen', id: 'provolta', label: 'TALK TO PROVOLTA' };   // the sanctuary's talk point
  if (!actTarget && window.CityPodium && CityPodium.actHere(P.x, P.z)) actTarget = { kind: 'podium', label: 'READ' };   // ALL THAT WE CAN DO! podium
  if (!actTarget && window.CityBook && CityBook.actHere(P.x, P.z)) actTarget = { kind: 'book', label: 'READ THE BOOK' };   // the King's Book of Law (Forum Plaza)
  if (!actTarget && window.CityCampus) { var cpt = CityCampus.actHere(P.x, P.z); if (cpt) actTarget = { kind: 'campus', id: cpt, label: 'OPEN COURSE CATALOG' }; }   // a campus hall's forecourt
  if (!actTarget && window.CityCitizens) { var cz = CityCitizens.near(P.x, P.z); if (cz) actTarget = { kind: 'citizen', id: cz.id, label: 'TALK TO ' + cz.name.toUpperCase() }; }
  if (!actTarget) for (var i = 0; i < portals.length; i++) {
    var po = portals[i], dp = Math.hypot(P.x - po.x, P.z - po.z);
    if (dp < 9) actTarget = { kind: 'portal', d: po.d, label: po.d.go ? po.d.go + ' →' : 'ENTER ' + po.d.label.toUpperCase() + ' →' };
    if (dp < 2.2 && S.portalCool <= 0) { openPortal(po.d); S.portalCool = 4; }
  }
  if (!actTarget && Math.hypot(P.x - PAD.x, P.z - PAD.z) < 34) actTarget = { kind: 'board', label: 'BOARD SHIP' };
  if (!actTarget && window.CityHyperTrain) { var trl = CityHyperTr