Card-Crack: Cardputer ESP32-S3 home-lab recon toolkit

Manual-trigger firmware toolkit for pentesting owned devices:
- Pin Scan: UART/JTAG/SWD detection (baud est + IDCODE reads)
- V-Sense: target voltage probe w/ logic-family guess
- UART Sniff: passive capture + manual-only frame replay
- USB Enum: ESP32-S3 host, read-only descriptor fingerprinting
- DefCred: single-host factory-default login check, rate-limited

Modular shell (core/ + modules/), PlatformIO build, hardware/safety docs.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01AAhMHMRAQLQ9hSbBECKNfn

src/main.cpp

@@ -0,0 +1,21 @@
+#include <M5Cardputer.h>
+#include "core/shell.h"
+
+// Card-Crack — Cardputer (ESP32-S3) recon toolkit for home-lab hardware
+// pentesting. Manual-trigger tools only; see README and docs/HARDWARE.md
+// before wiring anything to a live target.
+
+static Shell shell;
+
+void setup() {
+  auto cfg = M5.config();
+  M5Cardputer.begin(cfg, true);
+  M5.Display.setRotation(1);
+  M5.Display.setTextFont(&fonts::Font0);
+  shell.begin();
+}
+
+void loop() {
+  shell.loop();
+  delay(2);
+}