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/26-orchestrating-multiple-agents/lab/fan-out.sh

@@ -1,5 +1,5 @@
 #!/usr/bin/env bash
-# Module 26 lab — fan work out across a fleet of worktrees.
+# Module 26 lab: fan work out across a fleet of worktrees.
 #
 # Creates one worktree per issue, each on its own issue-named branch. main is left untouched
 # and reserved as the integration point. Run from inside your tasks-app repo.
@@ -34,5 +34,5 @@ for entry in "${FLEET[@]}"; do
 done
 
 echo
-echo "Fleet is up. main is reserved for integration — no agent works there."
+echo "Fleet is up. main is reserved for integration; no agent works there."
 git worktree list