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

0x0001a_stack/.vscode/extensions.json

@@ -0,0 +1,9 @@
+{
+    "recommendations": [
+        "marus25.cortex-debug",
+        "ms-vscode.cpptools",
+        "ms-vscode.cpptools-extension-pack",
+        "ms-vscode.vscode-serial-monitor",
+        "raspberry-pi.raspberry-pi-pico"
+    ]
+}