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/14-continuous-integration/lab/test_tasks.py

@@ -1,7 +1,7 @@
-"""Tests for the tasks-app core logic — the kind of suite Module 13 has you write.
+"""Tests for the tasks-app core logic: the kind of suite Module 13 has you write.
 
 Reproduced here so this module's lab is self-contained: if you already wrote tests in Module 13,
-use those instead. Standard-library `unittest`, exactly like Module 13 — nothing to install.
+use those instead. Standard-library `unittest`, exactly like Module 13, nothing to install.
 Run locally with `python -m unittest` from the project folder. CI runs exactly this.
 """