/**
 * Swarm chat Protomux pairing is **enabled by default** (stock builds).
 * Opt out with **`BARE_OS_PROTOMUX_CHAT_CHANNEL=0`**, **`false`**, **`off`**, or **`no`** (case-insensitive trim).
 * @param {Record<string, string | undefined> | null | undefined} env
 */
export function bareOsProtMuxChatChannelEnabled(env) {
  if (!env || typeof env !== 'object') return true
  const v = env.BARE_OS_PROTOMUX_CHAT_CHANNEL
  if (v === undefined || v === null) return true
  const s = String(v).trim().toLowerCase()
  if (s === '') return true
  if (s === '0' || s === 'false' || s === 'off' || s === 'no') return false
  return true
}