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/27-evals/lab/run_eval.py

@@ -68,9 +68,9 @@ def main(argv):
     print(f"\nscore: {passed}/{len(CASES)} = {score:.0%}   threshold: {args.threshold:.0%}")
 
     if score < args.threshold:
-        print("RESULT: below threshold — this change is NOT safe to ship.\n")
+        print("RESULT: below threshold; this change is NOT safe to ship.\n")
         return 1
-    print("RESULT: at or above threshold — safe by this eval.\n")
+    print("RESULT: at or above threshold; safe by this eval.\n")
     return 0