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

AGENTS.md

@@ -61,9 +61,18 @@ then use a calculator.
 Direct, concrete, rigorous. Reframe ops instincts the reader already has toward AI-assisted work.
 No motivational filler. When in doubt, show the command and what goes wrong without it.
 
-**No slop.** Don't write like an AI. Avoid "prose" (say "writing", "words", or "docs"), "unlock",
-"leverage" as filler, "delve", "dive in", "seamless", "in today's fast-paced", "it's worth noting".
-Don't lean on em-dashes — at density they read as a machine tell; vary the punctuation.
+**No slop (hard rules).** Don't write like an AI.
+
+- **No em-dash character (`—`) anywhere.** Use a semicolon, a period, a comma, or restructure the
+  sentence. This is absolute; self-check every edit by searching for `—` and removing each one.
+- **Banned words:** "prose" (say "writing"/"words"/"docs"), delve, leverage, utilize, foster,
+  bolster, underscore, unveil, streamline, robust, comprehensive, pivotal, seamless, significantly,
+  extremely, truly, unlock, "dive in".
+- **Banned openers/transitions:** Furthermore, Moreover, That being said, In today's world,
+  It's worth noting, When it comes to.
+- No hollow "this is important" statements, no intensifier standing in for a number, no weasel
+  hedges ("may potentially", "can help to"), no dramatic/teasing headings (a heading names its
+  content). End claims on a concrete, checkable fact.
 
 ## Conventions for labs