Add 0x0026a custom AES-128-CMAC secure bootloader, Week 11a notebook, and README links

0x0026a_custom-bootloader/bootloader/include/image.h

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+/**
+ * @file image.h
+ * @brief Control transfer into a freshly verified Cortex-M application.
+ * @author Kevin Thomas
+ * @date 2026
+ *
+ * MIT License
+ * Copyright (c) 2026 Kevin Thomas
+ */
+
+#ifndef IMAGE_H
+#define IMAGE_H
+
+#include <stdint.h>
+
+/**
+ * @brief Jump to an application whose vector table starts at a base address.
+ * @param vector_base Base address of the application vector table.
+ * @return void Does not return to the caller.
+ */
+void image_start(uint32_t vector_base);
+
+#endif