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/11-collaboration-humans-and-agents/lab/issue.md

@@ -1,8 +1,8 @@
 <!--
-  Module 11 lab — the issue to file (the "contract" / station 1 of the loop).
+  Module 11 lab: the issue to file (the "contract" / station 1 of the loop).
 
   Create a new issue on your git host. Paste the line below as the TITLE and everything under
-  "Body" as the issue description. Note the number the host assigns it (e.g. #42) — every later
+  "Body" as the issue description. Note the number the host assigns it (e.g. #42); every later
   step references it. Assign it to yourself for the first run-through.
 -->
 

modules/11-collaboration-humans-and-agents/lab/pr-body.md

@@ -1,5 +1,5 @@
 <!--
-  Module 11 lab — the pull request description (station 4 of the loop).
+  Module 11 lab: the pull request description (station 4 of the loop).
 
   Paste this as the body when you open the PR from your branch into main. The "Closes" line is the
   load-bearing part: replace 42 with YOUR issue number. On merge to the default branch, the host
@@ -18,7 +18,7 @@ method in `tasks.py`; `cli.py` just wires up the command and reports how many ta
 
 - Added a mix of pending and done tasks, ran `clear-done`, confirmed only the done ones were removed
   and the count printed.
-- Ran `clear-done` with nothing marked done — removed 0, no crash.
+- Ran `clear-done` with nothing marked done: removed 0, no crash.
 
 ## Review notes