Merge branch 'master' into refactor/split-oncommands-train

Brings the branch up to date after ~6 weeks of drift (51 commits).

The only real conflict was vehicle/Train.cpp, deleted here and modified
on master by 763a76d4, which added a dynamicbrake_pos entry to
GetTrainState. That line is re-applied in its new home,
vehicle/train/TrainState.cpp; the file deletion is kept.

utilities/uart.cpp and vehicle/Driver.cpp merged cleanly: master edited
function bodies, this branch only rewrote the Train.h include paths.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

utilities/uart.cpp

@@ -506,6 +506,19 @@ void uart_input::poll()
                 0
             );
         }
+		if (true == conf.dynamicenable)
+		{
+			// dynamic brake 8 bit
+			double const position{(float)(buffer[13] - conf.dynamicbrakemin) / (conf.dynamicbrakemax - conf.dynamicbrakemin)};
+
+			relay.post(
+                user_command::dynamicbrakecontrollerset,
+                position,
+                0,
+                GLFW_PRESS,
+                0
+            );
+		}
 
         old_packet = buffer;
     }