Course update: lessons, CTF 0x0011a_cb, and documentation

- 0x0011a_cb (Operation Dark Vector): nation-state CTF redesign with an
  AES-128-ECB sealed target and a plaintext launch origin; RP2350 firmware with
  bearing-driven servo, tri-color LEDs, GSV stats, and a realistic no-fix path
- docs: story-driven classified brief, GDB and Ghidra tutorials with deep
  step-throughs, regenerated artifacts and PDFs
- scripts: docstring standard, AES per-student randomizer, telemetry monitor
- week 3 to week 5 lessons: Ghidra patching tutorial, CMSIS-SVD hardware RE,
  double floating-point and GPIO architecture chapters, README structure

0x0011a_cb/include/aes.h

@@ -0,0 +1,24 @@
+// MIT License
+//
+// Copyright (c) 2026 Kevin Thomas
+//
+// File:    aes.h
+// Desc:    Declares AES-128-ECB single-block decryption.
+// Created: 2026
+
+#ifndef AES_H
+#define AES_H
+
+#include <stdint.h>
+
+/**
+ * @brief Decrypt one 16-byte block with AES-128-ECB.
+ *
+ * @param in 16-byte ciphertext.
+ * @param key 16-byte key.
+ * @param out 16-byte plaintext output.
+ * @return None.
+ */
+void aes128_ecb_decrypt_block(const uint8_t in[16], const uint8_t key[16], uint8_t out[16]);
+
+#endif // AES_H