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/18-continuous-delivery-and-deployment/lab/serve.py

@@ -1,6 +1,6 @@
 """Minimal HTTP face for the tasks-app, so there is something long-running to *deploy*.
 
-Standard library only — no pip install, so the container image stays tiny and the lab has no
+Standard library only, no pip install, so the container image stays tiny and the lab has no
 dependencies to drift. It reuses the TaskList from tasks.py (Modules 1-2) unchanged.
 
 Run it:
@@ -12,7 +12,7 @@ Endpoints:
 
 Two environment knobs make this realistic for the CD lab (config injected at run time, Module 17):
     APP_VERSION   what /health reports as the running version (set by deploy.sh to the commit SHA)
-    BREAK=1       force /health to return 500 — a stand-in for "this build starts but is broken",
+    BREAK=1       force /health to return 500, a stand-in for "this build starts but is broken",
                   used in Part D to trigger an automatic rollback.
 """