fix: Add GPS retry mechanism for turtles without initial position

turtle.lua

@@ -932,6 +932,10 @@ if x then
 else
     print("GPS: Not available - will retry in background")
     print("Position tracking disabled for now.")
+    -- Initialize position to nil so we know we need GPS
+    state.position = nil
+    print("⚠️  WARNING: Without GPS, relative positioning will be inaccurate!")
+    print("⚠️  Please place GPS hosts or set home position manually.")
 end
 
 -- Sync state with server
@@ -951,6 +955,18 @@ print("Turtle " .. os.getComputerID() .. " is online!")
 
 -- Main execution loop
 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
+            end
+        end
+    end,
+    
     function()
         -- Status broadcast loop
         while true do