build: release-x86-64 — the flashable hybrid ISO (Etcher/dd + optical), built in-repo

README.md

@@ -54,6 +54,17 @@ the UEFI bootloader at `zig-out/EFI/BOOT/BOOTX64.efi`, the kernel at
 `zig-out/system/kernel`, init at `zig-out/system/services/init`, drivers under
 `zig-out/system/drivers/`, and the initial-ramdisk at `zig-out/boot/`.
 
+## Release media
+
+```sh
+zig build release-x86-64
+```
+
+Produces `zig-out/danos-x86-64.iso`, a hybrid ISO that boots flashed raw to a
+USB stick (balenaEtcher, dd) or burned to optical media — see
+[docs/release-iso.md](docs/release-iso.md). `zig build check-iso-image`
+validates it without booting.
+
 ## Run
 
 Boot it in QEMU with OVMF (opens a display window):