style(no-slop): remove every em-dash + banned words across all modules + capstone

Apply the no-ai-slop standard (now binding in AGENTS.md): the em-dash character is
banned outright (restructured, not blind-replaced), plus the banned word/phrase
list (delve, leverage, robust, seamless, truly, unlock, etc.). 0 em-dashes remain
in modules + capstone; the only "robust" left is the planted M10 ai-change.patch
trap. Module H1 titles use a colon separator.

All deliberate teaching devices preserved; labs compile/parse (py/sh/yaml/json);
no junk. AGENTS.md updated with the hard no-slop rules.

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

modules/24-assistive-agents/lab/review-rubric.md

@@ -1,11 +1,11 @@
-# Review rubric — the AI reviewer's instructions
+# Review rubric: the AI reviewer's instructions
 
 This is the committed instruction set the AI reviewer reads before it looks at a diff. It lives in
 the repo on purpose: like the committed AI config from Module 5 and the skills from Module 21, a
 review rubric is a durable, versioned artifact. Change how the reviewer behaves and that change
 arrives as a diff in a PR, reviewable like any other.
 
-Keep it short and opinionated. A vague rubric produces vague, noisy comments — the fastest way to
+Keep it short and opinionated. A vague rubric produces vague, noisy comments, the fastest way to
 get a team to ignore the AI reviewer entirely.
 
 ## What to check, in priority order
@@ -17,7 +17,7 @@ get a team to ignore the AI reviewer entirely.
 3. **Security smells (Module 15).** Hardcoded secrets, shelling out on unsanitized input, a new
    dependency that doesn't obviously exist.
 4. **Correctness on edge cases.** Empty input, bad index, missing file.
-5. **Style nits — last, and clearly labeled.** Only if they matter. Nits drown signal.
+5. **Style nits, last, and clearly labeled.** Only if they matter. Nits drown signal.
 
 ## How to comment