FastRIO certified: 31250v2 final runs clean; config plumbing for baud/poll

Operator-verified zero lamp misses/hangs through the slow-chord test
(62500's killer) and 392/min mash. Final run: NAK=0, 25 timeout resends
silently healing inbound response loss, counters flat, zero wedges.
--poll 20 delivered ~31Hz analog (1.7x legacy); the shortfall vs 50Hz
is additive host pacing (delay after awaited exchange), not board
saturation - noted as a future host tweak.

AppConfig gains RioBaudRate (default 9600) + AnalogPollMs (default 55),
plumbed through RioCoordinator; existing configs unchanged. Production
matrix recorded in ANALYSIS.md: 9600 patched chip for native-game
cabinets, 31250v2 + poll 20-25 + FTDI for RIOJoy cockpits.

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

src/RioJoy.Core/Profiles/AppConfig.cs

@@ -10,6 +10,21 @@ public sealed class AppConfig
     /// <summary>Default RIO COM port when a profile doesn't specify one.</summary>
     public string DefaultRioComPort { get; set; } = "COM1";
 
+    /// <summary>
+    /// RIO link baud rate. 9600 = stock/wedge-patched firmware (native-game
+    /// compatible). 31250 = the validated FastRIO chip
+    /// (rio-firmware/RIOv4_2_patched_31250v2.bin) — needs an FTDI-class
+    /// adapter; classic 16550 UARTs cannot make this rate.
+    /// </summary>
+    public int RioBaudRate { get; set; } = 9600;
+
+    /// <summary>
+    /// Analog poll interval in milliseconds (legacy cadence 55 → ~18 Hz).
+    /// The FastRIO chip sustains ~20-25 ms (~30+ Hz effective; bench
+    /// 2026-07-19). Leave at 55 for stock-speed boards.
+    /// </summary>
+    public int AnalogPollMs { get; set; } = 55;
+
     /// <summary>Default plasma COM port when a profile doesn't specify one.</summary>
     public string? DefaultPlasmaComPort { get; set; } = "COM2";
 

src/RioJoy.Tray/RioCoordinator.cs

@@ -47,7 +47,8 @@ public sealed class RioCoordinator : IDisposable
     public RioCoordinator(Func<AppConfig> config, Func<string, IRioTransport>? transportFactory = null)
     {
         _config = config ?? throw new ArgumentNullException(nameof(config));
-        _transportFactory = transportFactory ?? (port => new SerialPortTransport(port));
+        _transportFactory = transportFactory
+            ?? (port => new SerialPortTransport(port, _config().RioBaudRate));
     }
 
     /// <summary>Raised (with a short status string) whenever the active state changes.</summary>
@@ -211,7 +212,11 @@ public sealed class RioCoordinator : IDisposable
             }
 
             _transport = _transportFactory(port);
-            _link = new RioSerialLink(_transport);
+            _link = new RioSerialLink(_transport, new RioSerialLinkOptions
+            {
+                AnalogPollInterval = TimeSpan.FromMilliseconds(
+                    Math.Max(10, config.AnalogPollMs)), // floor guards a typo'd config
+            });
             _runtime = new RioRuntime(
                 _link,
                 profile.ToInputMap(),