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/gitlab-ci-starter.yml

@@ -1,7 +1,7 @@
 # The SAME pipeline as ci-starter.yml, written for GitLab CI instead of GitHub Actions.
 #
 # The point of having both side by side: CI is a concept, not a product. Checkout, set up the
-# language, install tools, lint, test — every forge does these. Only the YAML dialect and the
+# language, install tools, lint, test: every forge does these. Only the YAML dialect and the
 # magic filename differ.
 #
 # Where this file goes: GitLab reads a single file named .gitlab-ci.yml at the repo root. Copy this
@@ -13,10 +13,10 @@ stages:
 
 check:
   stage: check
-  # The runner image — a throwaway container with Python already installed. The GitLab equivalent
+  # The runner image: a throwaway container with Python already installed. The GitLab equivalent
   # of "runs-on: ubuntu-latest" plus "set up Python".
   image: python:3.12
   script:
     - pip install ruff
     - ruff check .          # lint
-    - python -m unittest    # test (stdlib runner from Module 13 — nothing to install)
+    - python -m unittest    # test (stdlib runner from Module 13; nothing to install)