Fix --host-command sending truncated payload on invalid byte

[Copilot]

When --host-command encountered an invalid payload byte, it breaked the parse loop but still returned Some((cmd_id, version, data)) — silently sending a truncated command instead of failing.

Changes

• framework_lib/src/commandline/uefi.rs: Introduce a parse_error flag in the byte-parsing loop. On an invalid byte, set the flag and break; after the loop, return None if parse_error is set, making any malformed payload a hard parse failure.

// Before: truncated data silently sent
let mut data = Vec::new();
for j in (i + 3)..args.len() {
    ...
    } else {
        println!("Invalid data byte for --host-command: '{}'", args[j]);
        break; // still falls through to Some(...)
    }
}
Some((cmd_id, version, data))

// After: invalid byte aborts the command entirely
let mut parse_error = false;
for j in (i + 3)..args.len() {
    ...
    } else {
        println!("Invalid data byte for --host-command: '{}'", args[j]);
        parse_error = true;
        break;
    }
}
if parse_error { None } else { Some((cmd_id, version, data)) }

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