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QEMU supports passing inline string values to the guest via fw_cfg (-fw_cfg name=...,string=...). Cloud Hypervisor previously only supported file-backed fw_cfg items. This adds the 'string' option so users can pass values like OVMF's X-PciMmio64Mb without creating a temporary file on the host. Each fw_cfg item now accepts exactly one of 'file' or 'string'. The FwCfgInvalidItem invariant is validated in PayloadConfig::validate() (via FwCfgConfig::validate()), covering both CLI and JSON API paths. The populate_fw_cfg match arm uses unreachable!() since validation guarantees the invariant holds at that point. CLI syntax: --fw-cfg-config items=[name=opt/ovmf/X-PciMmio64Mb,string=262144] Signed-off-by: Keith Adler <kadler@cloudflare.com>