revert: remove _update_ts injection as it breaks ticket scanning

ticketmachine.lua

@@ -84,14 +84,10 @@ local function fetchHTTP(url)
   end
 end
 
-local checkGlobalUpdate = nil
-
 local function fetchJSON(url)
   local txt = fetchHTTP(url)
   if not txt then return nil end
-  local parsed = jsonDecode(txt)
-  if checkGlobalUpdate then checkGlobalUpdate(parsed) end
-  return parsed
+  return jsonDecode(txt)
 end
 
 local function ensureDir(path)
@@ -158,7 +154,6 @@ local function postJSON(url, dataTable)
     return false, code, nil, tostring(err or 'request error')
   end
   local parsed = jsonDecode(body)
-  if checkGlobalUpdate then checkGlobalUpdate(parsed) end
   if code < 200 or code >= 300 then
     local msg = nil
     if type(parsed) == 'table' then
@@ -694,48 +689,6 @@ local function drawVersionIndicator()
   termDev.setTextColor(colors.white)
 end
 
-checkGlobalUpdate = function(parsed)
-  if type(parsed) == 'table' and parsed._update_ts then
-    local remoteTs = tonumber(parsed._update_ts)
-    if remoteTs and remoteTs > 0 then
-      local attemptFile = ".last_update_ts"
-      local tried = 0
-      if fs.exists(attemptFile) then
-        local f = fs.open(attemptFile, "r")
-        tried = tonumber(f and f.readAll() or "0") or 0
-        if f then f.close() end
-      end
-      if remoteTs > tried then
-        isUpdating = true
-        pcall(drawVersionIndicator)
-        sleep(0.5)
-        
-        local f = fs.open(attemptFile, "w")
-        if f then f.write(tostring(remoteTs)); f.close() end
-        
-        local env = setmetatable({ AUTO_UPDATE_SILENT = true }, { __index = _G or getfenv() or _ENV })
-        local fn, err = loadfile("update_machine.lua", env)
-        if fn then
-          local ok, res = pcall(fn, "--silent")
-          if not ok then
-            lastUpdateError = string.sub(tostring(res), 1, 30)
-          end
-        else
-          lastUpdateError = "loadfile failed: " .. tostring(err)
-        end
-        
-        isUpdating = false
-        pcall(drawVersionIndicator)
-        
-        if lastUpdateError then
-          sleep(3)
-        end
-        os.reboot()
-      end
-    end
-  end
-end
-
 local function checkAndApplyUpdate()
   if type(CFG) ~= 'table' then return end
   local remoteTs = tonumber(CFG.update_timestamp)