Standardizes formatting and adds output signal

Adjusts entity and architecture formatting for consistency, aligning spacing and indentation across declarations and constants.

Adds `O_MUX_Select` output signal to indicate routing decision, improving functionality and clarity of the module.

src/PipelineSwitch.vhd

@@ -39,6 +39,9 @@ entity PipelineSwitch is
         O_Ready : out std_logic := '0';
         --@ @end
 
+        --@ If `1`, route to `Selected` output; if `0`, route to `Default` output.
+        O_MUX_Select : out std_logic := '0';
+
         --@ @virtualbus AXI-Flags-Out @dir Out Output interface for unmatched routing
         --@ Activated when the comparison **fails**.
         --@ AXI-like valid; (**Synchronous**, **Active high**)
@@ -189,4 +192,6 @@ begin
         end if;
     end process;
 
+    O_MUX_Select <= C_ShouldRouteToSelected;
+
 end architecture;