rate and prefer: understanding, readability, friendliness, page load

Readability is counted (LIX), not judged. Understanding is three
yes-or-no questions per persona, with a gutted twin of every page as
the control: an instrument that still says yes to "Option 1, Option 2"
is not measuring the page. Friendliness is a preference between two
versions shown in both orders; a pick that flips with the order counts
as no preference. Page load (options offered, required fields in the
step) flags a page that should be split into a further question or
have fields moved to a later stage.

First run on the generated contractor site, qwen3:8b as the visitor:
control passed on every need; "what happens next" was 0/2 everywhere
and 2/2 everywhere once the page said who reads it and when (LIX 28 to
30); an official-voice control reads LIX 63 against 27. Friendliness
mostly came back "no preference" at two personas per need: directionally
right (never preferred the cold version), too thin to rely on.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01L4jrCgLiKKHAEFuZUJjckH

src/main.rs

@@ -22,6 +22,7 @@ use std::process::{Command, Stdio};
 
 use anyhow::{anyhow, bail, Context};
 
+mod rate;
 mod simulate;
 
 const REFERENCE: &str = include_str!("../generator/reference.md");
@@ -43,6 +44,8 @@ fn main() -> anyhow::Result<()> {
     match argv.first().map(String::as_str) {
         Some("simulate") => return simulate::run(&argv),
         Some("compare") => return simulate::compare(&argv),
+        Some("rate") => return rate::rate(&argv),
+        Some("prefer") => return rate::prefer(&argv),
         _ => {}
     }
     if argv.first().map(String::as_str) == Some("answer") {