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/04-getting-the-ai-out-of-the-browser/lab/verify.sh

@@ -1,10 +1,10 @@
 #!/usr/bin/env bash
 #
-# verify.sh — Module 4 lab check.
+# verify.sh: Module 4 lab check.
 #
 # Exercises the `delete <index>` command the AI implemented across tasks.py and cli.py.
 # It adds three tasks, deletes the middle one by index, and confirms the right task is gone
-# and the other two remain. This is a behavior check on the multi-file change — it does not
+# and the other two remain. This is a behavior check on the multi-file change; it does not
 # care HOW the AI implemented it, only that `delete` works end to end.
 #
 # Copy this into your tasks-app project directory, then run it from there: