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/13-testing-in-the-ai-era/lab/tasks-app/README.md

@@ -1,16 +1,16 @@
-# Demo app — `tasks` (Module 13 copy)
+# Demo app: `tasks` (Module 13 copy)
 
 The same tiny task tracker from Modules 1 and 2, with one feature added: a `count` command backed
 by `TaskList.pending_count()`. Use this copy for the Module 13 lab so everyone starts from the same
-code — including the same latent bug.
+code, including the same latent bug.
 
 If you already have a `tasks-app` from earlier modules, you can use that instead; just make sure it
 has a `count` command (the Module 2 lab added one). The planted bug in this copy is there on purpose.
 
 ## Files
 
-- `tasks.py` — core logic (`Task`, `TaskList`), now with `pending_count()`.
-- `cli.py` — command-line front end. Adds `count`.
+- `tasks.py`: core logic (`Task`, `TaskList`), now with `pending_count()`.
+- `cli.py`: command-line front end. Adds `count`.
 
 ## Run it
 
@@ -22,4 +22,4 @@ python cli.py list
 python cli.py count
 ```
 
-Requires Python 3.10+. No third-party packages — tests use the standard library `unittest`.
+Requires Python 3.10+. No third-party packages; tests use the standard library `unittest`.

modules/13-testing-in-the-ai-era/lab/tasks-app/tasks.py

@@ -2,7 +2,7 @@
 
 Same running example from Modules 1 and 2, carried forward. It has grown one feature since then:
 a `pending_count()` helper that the AI added to back a `count` command. The feature "works" in
-the obvious case — which is exactly the kind of code this module teaches you to verify properly.
+the obvious case, which is exactly the kind of code this module teaches you to verify properly.
 """
 
 from dataclasses import dataclass, field