fix(M7-27+capstone): apply AI-drives-git reframe, lesson=theory, de-slop course-wide

Phase 2 sweep — all modules are post-pivot, so the learner directs the AI agent
(Claude Code as the worked example) to do the git/setup work and verifies, instead
of typing commands by hand; no re-teaching basics. Lesson sections are theory with
example output; all execution lives in the labs. De-slopped ("prose" etc. gone
course-wide, em-dash density thinned). /path/to placeholders -> ~/ai-workflow-course.

Every deliberate teaching device verified intact: M10 ai-change.patch trap,
M12 bad-clear-snippet, M13/M27 planted pending_count bug, M15 secret+typosquat+MD5,
M18 BREAK=1, M21 absent-.gitignore, M22 poisoned skill, M24 no-op patch, M25 --simulate.
Labs compile/parse (py/sh/yaml/json); no junk.

Closes #83
Closes #86
Closes #89

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TfzV5QvtPDz8LJS3Pu5VLT

modules/10-reviewing-code-you-didnt-write/lab/ai-diff-review-checklist.md

@@ -7,7 +7,7 @@ file; it's to interrogate **the change** against the prompt you gave. Work top t
 
 - [ ] **What did I actually ask for?** Write the request in one sentence. Every changed line
       should trace back to it.
-- [ ] **Read the diff, not the prose.** Ignore the AI's summary of what it did; the diff is the
+- [ ] **Read the diff, not the summary.** Ignore the AI's account of what it did; the diff is the
       only ground truth. (`git diff main..<branch>`)
 
 ## 1. Scope — did it change only what was asked?