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/23-working-with-existing-codebases/lab/skills/map-this-repo.md

@@ -1,7 +1,7 @@
 # Skill: Map this repo
 
 A navigation playbook (a Module 21 skill) for orienting in a codebase you didn't write.
-Point your agentic tool at this file as a skill, or paste it in as instructions. The goal is a
+Point Claude Code (or sub your own agent) at this file as a skill, or paste it in as instructions. The goal is a
 **read-only** mental model — no edits happen here.
 
 ## When to use
@@ -11,7 +11,7 @@ At the start of any session on an unfamiliar repo, before any change is discusse
 - **Read only.** Do not edit, create, or delete files while mapping. No exceptions.
 - **Cite real paths.** Every claim about the code must point to a file and, ideally, a line range.
   If you can't cite it, say "unverified" instead of guessing.
-- **Breadth before depth.** Establish the whole shape before diving into any one area.
+- **Breadth before depth.** Establish the whole shape before going deep on any one area.
 - **No conclusions from file names alone.** A file called `auth.py` may not be where auth lives.
 
 ## Steps