Record networking and DMA development progress

Add the current OS source tree, build scripts, system image layout, and development notes covering DMA page allocation, e1000 bring-up, net API dispatch, and DHCP work in progress.

CODE/UTSM/kernel/panic.c

@@ -0,0 +1,9 @@
+#include <utsm/log.h>
+
+void arch_halt_forever(void);
+
+void panic(const char *msg) {
+    log_error("[PANIC]");
+    log_error(msg);
+    arch_halt_forever();
+}