docs: sort Prerequisites lists numerically ascending (#100)

Reorder the `## Prerequisites` bullets in 9 modules so prior modules
are listed lowest number first instead of by pedagogical importance or
at random. A trailing "Helpful but not required" group stays last and
is sorted within itself; multi-module bullets sort by their lowest
number. Intro/closing paragraphs are left in place. Prose is unchanged;
only bullet order moves.

Modules touched: 7, 9, 14, 15, 22, 24, 25, 26, 27. The other 18 modules
were already ascending (or have one/zero prereqs) and are untouched.
Module 19's "Helpful but not required: Module 16" correctly trails its
ascending 8/14/18 main list, so it stays as is.

Closes #100

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CamgR4HaVpfaqUViuHUcWw

modules/27-evals/README.md

@@ -13,12 +13,12 @@ This is the closer. It assumes the whole course, but it leans hardest on:
 - **Module 1**: the thesis (the model is the cheap, swappable part; the workflow is the durable
   skill) and the `tasks-app` we've carried the whole way. This module is where the thesis gets its
   proof.
+- **Module 10, Reviewing Code You Didn't Write**: the human review skill evals partially automate
+  and partially *replace* once a human isn't in the loop.
 - **Module 13, Testing in the AI Era**: you can write a deterministic pass/fail check. Evals are
   the next thing up the ladder: scoring output that a single test can't fully pin down.
 - **Module 14, Continuous Integration**: running checks automatically on every change, with an
   exit code that gates. Evals run the same way and gate the same way.
-- **Module 10, Reviewing Code You Didn't Write**: the human review skill evals partially automate
-  and partially *replace* once a human isn't in the loop.
 - **Modules 24–26, the Unit 5 agent ladder**: assistive agents (24), autonomous-but-supervised
   agents (25), and orchestrated fleets (26). Evals are what decide how far up that ladder any given
   agent is allowed to climb.