Added the "KEvent" console command. (#17)

This PR adds a new console command, "KEvent", which allows the sending of arbitrary events to the [state machine](https://ktag.clubk.club/Technology/SystemK/#state-machine).  The events are specified by [ID](https://git.ktag.clubk.club/Software/SystemK/src/tag/SystemK_v01.01/Events/KEvents.h#L33-L86), which may change from release-to-release of SystemK.

```
KTag> KEvent
Usage:
  KEvent <Event ID> <Event Data>
  (Note that IDs may be SystemK version-dependent.)
```

Co-authored-by: Joe Kearney <joe@clubk.club>
Reviewed-on: #17

components/Serial_Console/CMakeLists.txt

@@ -2,6 +2,7 @@ idf_component_register(
     SRCS
         "Console.c"
         "Commands/Log_Command.c"
+        "Commands/KEvent_Command.c"
         "Commands/System_Command.c"
     INCLUDE_DIRS
         "."

components/Serial_Console/Commands/KEvent_Command.c

@@ -0,0 +1,99 @@
+/*
+ * This program source code file is part of the KTag project, a DIY laser tag
+ * game with customizable features and wide interoperability.
+ *
+ * 🛡 <https://ktag.clubk.club> 🃞
+ *
+ * Copyright © 2026 Joseph P. Kearney and the KTag developers.
+ *
+ * This program is free software: you can redistribute it and/or modify it under
+ * the terms of the GNU Affero General Public License as published by the Free
+ * Software Foundation, either version 3 of the License, or (at your option) any
+ * later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU Affero General Public License for more
+ * details.
+ *
+ * There should be a copy of the GNU Affero General Public License in the LICENSE
+ * file in the root of this repository.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <errno.h>
+#include <limits.h>
+#include "esp_console.h"
+#include "esp_log.h"
+#include "SystemK.h"
+
+static uint32_t parse_uint32(const char *str, bool *ok)
+{
+    char *end;
+    errno = 0;
+    unsigned long val = strtoul(str, &end, 10);
+
+    if (errno != 0 || end == str || *end != '\0' || val > UINT32_MAX)
+    {
+        *ok = false;
+        return 0;
+    }
+
+    *ok = true;
+    return (uint32_t)val;
+}
+
+static void print_usage(void)
+{
+    printf(
+        "Usage:\n"
+        "  KEvent <Event ID> <Event Data>\n"
+        "  (Note that IDs may be SystemK version-dependent.)\n");
+}
+
+static int cmd_KEvent(int argc, char **argv)
+{
+    KEvent_T event;
+    uint32_t data;
+
+    if (argc < 2)
+    {
+        print_usage();
+        return 0;
+    }
+
+    if (Parse_KEvent_ID(argv[1], &event) == SYSTEMK_RESULT_SUCCESS)
+    {
+        bool ok;
+        data = parse_uint32(argv[2], &ok);
+        if (ok == true)
+        {
+            event.Data = (void *)data;
+            Post_KEvent(&event);
+            return 0;
+        }
+        else
+        {
+            printf("ERROR: Couldn't parse data!");
+            return (-1);
+        }
+    }
+    else
+    {
+        printf("ERROR: Couldn't parse SystemK event!");
+        return (-1);
+    }
+}
+
+void Register_KEvent_Command(void)
+{
+    const esp_console_cmd_t cmd = {
+        .command = "KEvent",
+        .help = "Send arbitrary KEvents by ID",
+        .func = &cmd_KEvent,
+    };
+
+    ESP_ERROR_CHECK(esp_console_cmd_register(&cmd));
+}

components/Serial_Console/Commands/KEvent_Command.h

@@ -0,0 +1,23 @@
+/*
+ * This program source code file is part of the KTag project, a DIY laser tag
+ * game with customizable features and wide interoperability.
+ *
+ * 🛡 <https://ktag.clubk.club> 🃞
+ *
+ * Copyright © 2026 Joseph P. Kearney and the KTag developers.
+ *
+ * This program is free software: you can redistribute it and/or modify it under
+ * the terms of the GNU Affero General Public License as published by the Free
+ * Software Foundation, either version 3 of the License, or (at your option) any
+ * later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU Affero General Public License for more
+ * details.
+ *
+ * There should be a copy of the GNU Affero General Public License in the LICENSE
+ * file in the root of this repository.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+void Register_KEvent_Command(void);

components/Serial_Console/Console.c

@@ -21,11 +21,13 @@
  */
 
 #include "esp_console.h"
+#include <KEvent_Command.h>
 #include <Log_Command.h>
 #include <System_Command.h>
 
 static void register_commands()
 {
+    Register_KEvent_Command();
     Register_Log_Command();
     Register_System_Command();
     esp_console_register_help_command();