Add Classified Briefs 3, 4, and 5 with full firmware and README updates

0x0020a_cb/src/main.c

@@ -0,0 +1,25 @@
+#include <stdio.h>
+#include "pico/stdlib.h"
+
+uint32_t simulated_ir_rx_code = 0x00FF00FF;
+
+static void parse_nec_code(uint32_t code) {
+    if (code == 0xFF0055AA) {
+        printf("DAZZLER POWER LEVEL: MAX\r\n");
+    } else if (code == 0xFF00AA55) {
+        printf("DAZZLER TRACKING: ENGAGED\r\n");
+    } else if (code == 0xDEADBEEF) {
+        printf("FRIENDLY FIRE LOCKOUT TRIGGERED. DAZZLER DISABLED.\r\n");
+        while(1); // Permanent lockout
+    } else {
+        printf("UNKNOWN IR COMMAND.\r\n");
+    }
+}
+
+int main(void) {
+    stdio_init_all();
+    while (true) {
+        parse_nec_code(simulated_ir_rx_code);
+        sleep_ms(1000);
+    }
+}