De-slop: remove every em-dash + banned words across all modules + capstone (#94)

Co-authored-by: claude <claude@jpaul.io>
Co-committed-by: claude <claude@jpaul.io>

modules/07-worktrees-running-agents-in-parallel/lab/agent-a-prompt.md

@@ -1,4 +1,4 @@
-# Agent A prompt — the `wipe` command
+# Agent A prompt: the `wipe` command
 
 Paste this into the AI session you've pointed at the `tasks-app-wipe` worktree folder.
 

modules/07-worktrees-running-agents-in-parallel/lab/agent-b-prompt.md

@@ -1,4 +1,4 @@
-# Agent B prompt — the `remaining` command
+# Agent B prompt: the `remaining` command
 
 Paste this into the AI session you've pointed at the `tasks-app-remaining` worktree folder.
 

modules/07-worktrees-running-agents-in-parallel/lab/cleanup-worktrees.sh

@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 #
-# Module 7 lab — tear down the two worktrees created by setup-worktrees.sh.
+# Module 7 lab: tear down the two worktrees created by setup-worktrees.sh.
 # The tool the coordinating AI session runs to clean up. Hand it to your agent, or copy it into
 # tasks-app and let the agent run it:
 #

modules/07-worktrees-running-agents-in-parallel/lab/setup-worktrees.sh

@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 #
-# Module 7 lab — create two linked worktrees off the tasks-app repo, each on its own branch.
+# Module 7 lab: create two linked worktrees off the tasks-app repo, each on its own branch.
 # This is the tool the coordinating AI session (the one already pointed at tasks-app) can run to
 # set up the worktrees. Hand it to your agent, or copy it into tasks-app and let the agent run it:
 #