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/03-version-control-for-words/lab/runbook-template.md

@@ -1,5 +1,5 @@
 <!--
-  Runbook template — the step-by-step for one operational task.
+  Runbook template: the step-by-step for one operational task.
 
   A runbook is read under pressure, often by someone who is not the person who wrote it and not at
   their best (it's 3 a.m., something is on fire). Optimize for "follow it exactly, no thinking
@@ -11,10 +11,10 @@
   Delete these HTML comments when you write the real runbook.
 -->
 
-# Runbook — <task name>
+# Runbook: <task name>
 
 - **Purpose:** <one sentence: what this runbook gets you out of>
-- **When to run:** <the trigger — the alert, the symptom, the request>
+- **When to run:** <the trigger, e.g. the alert, the symptom, or the request>
 - **Owner:** <team or role responsible>
 - **Last verified:** YYYY-MM-DD