Fix ALU: Use out pin directly instead of internal finalout bus

- Removed invalid finalout internal bus
- Use out[0..7], out[8..15], out[15] directly for flag computation
- Fixes HDL sub-bus restriction error

02/HalfAdder.out

@@ -0,0 +1,5 @@
+| a | b |sum|car|
+| 0 | 0 | 0 | 0 |
+| 0 | 1 | 1 | 0 |
+| 1 | 0 | 1 | 0 |
+| 1 | 1 | 0 | 1 |