De-slop: remove every em-dash + banned words across all modules + capstone (#94)

Co-authored-by: claude <claude@jpaul.io>
Co-committed-by: claude <claude@jpaul.io>

modules/15-security-scanning/lab/ci-security.yml

@@ -1,4 +1,4 @@
-# ci-security.yml — the security gate as a CI step (Module 15).
+# ci-security.yml: the security gate as a CI step (Module 15).
 #
 # This is a PROVIDER-NEUTRAL snippet, not a drop-in file. The YAML below uses the widely-shared
 # "workflow / job / steps" shape that most hosted and self-hosted CI systems understand (the exact
@@ -24,7 +24,7 @@ jobs:
       - name: Check out the code
         uses: actions/checkout@v7
         # Secret scanning cares about history. If your tool scans commits (not just the working
-        # tree), fetch full history here — e.g. set `with: { fetch-depth: 0 }`.
+        # tree), fetch full history here; e.g. set `with: { fetch-depth: 0 }`.
 
       - name: Set up Python
         uses: actions/setup-python@v6