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/24-assistive-agents/lab/ai-review.sample.json

@@ -6,13 +6,13 @@
       "file": "cli.py",
       "line": 49,
       "severity": "blocker",
-      "comment": "The `clear` branch never calls save(tlist). The list is emptied in memory and the process exits, so tasks.json is untouched. It prints 'cleared all tasks' but the next `list` shows everything still there — a silent no-op. Add save(tlist) before printing."
+      "comment": "The `clear` branch never calls save(tlist). The list is emptied in memory and the process exits, so tasks.json is untouched. It prints 'cleared all tasks' but the next `list` shows everything still there, a silent no-op. Add save(tlist) before printing."
     },
     {
       "file": "tasks.py",
       "line": 28,
       "severity": "suggestion",
-      "comment": "No test covers clear(). Add one that adds two tasks, calls clear(), and asserts the list is empty — matching the Module 13 suite style."
+      "comment": "No test covers clear(). Add one that adds two tasks, calls clear(), and asserts the list is empty, matching the Module 13 suite style."
     },
     {
       "file": "tasks.py",