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/10-reviewing-code-you-didnt-write/lab/tasks-app/cli.py

@@ -6,7 +6,7 @@ Run it:
     python cli.py done 0
 
 State is kept in tasks.json next to this file. The `done` command turns a bad index into a
-clean error message and a non-zero exit code — note that behavior before you review the AI
+clean error message and a non-zero exit code; note that behavior before you review the AI
 change, so you can tell if the change quietly alters it.
 """