feat(adapter): init+storage packed into kernel image; drop adapter FAT16 reader + virtio-blk

Makefile

@@ -48,12 +48,15 @@ kani-kernel:
 
 kani: kani-types kani-domain kani-kernel
 
+# Programs first: the kernel image packs init and storage (see the
+# adapter's build.rs).
 build:
 	cargo build --target $(RISCV_TARGET) --release \
-		-p adapter-riscv -p init -p echo -p snake \
+		-p init -p echo -p snake \
 		-p display-qemu -p input-qemu -p storage-qemu \
 		-p log-server -p permission-manager -p session-server -p smptest -p spawntest -p hello \
 		-p terminal-server -p shell
+	cargo build --target $(RISCV_TARGET) --release -p adapter-riscv
 
 image: build
 	scripts/make-disk-image.sh