Function envInt

src/config.js:5–10

(key, fallback)

// Groups: network, solidify, evolution, ops, limits.

function envInt(key, fallback) {
  const v = process.env[key];
  if (v === undefined || v === '') return fallback;
  const n = parseInt(v, 10);
  return isNaN(n) ? fallback : n;
}

// Strict variant for timing / timeout / interval values that must be
// positive. Rejects: NaN (e.g. "5min" silently parses to 5 -- here 5 is