feat: Add error handling for turtle startup script and improve GPS retry logic

turtle.lua

@@ -965,12 +965,17 @@ print("Turtle " .. os.getComputerID() .. " is online!")
 parallel.waitForAny(
     function()
         -- GPS retry loop for turtles without initial position
-        while not state.position do
-            sleep(10) -- Try every 10 seconds
-            print("Retrying GPS...")
-            if updatePosition() then
-                print("✅ GPS acquired! Position:", textutils.serialize(state.position))
-                broadcastStatus() -- Send updated position immediately
+        while true do
+            if not state.position then
+                sleep(10) -- Try every 10 seconds
+                print("Retrying GPS...")
+                if updatePosition() then
+                    print("✅ GPS acquired! Position:", textutils.serialize(state.position))
+                    broadcastStatus() -- Send updated position immediately
+                end
+            else
+                -- Once we have position, just sleep to keep this thread alive
+                sleep(30)
             end
         end
     end,