Audit stored values before reusing a field

// before: one flag and "string present" carry several meanings
const optedOut = !info.enabled;           // legacy rows have enabled:false and still show
const authored = typeof info.text === 'string'; // '' was written as a side effect

// after: explicit field for the new intent; empty legacy value = "not set"
const optedOut = info.notice_disabled === true;
const authored = Boolean(info.text);