Use python3 as the canonical command name course-wide (#104) (#105)

modules/26-orchestrating-multiple-agents/lab/agent-prompts/agent-42-count.md

@@ -15,7 +15,7 @@ You are working in this worktree only. Do not touch any other folder.
 
 **Acceptance criteria:**
 
-- `python cli.py count` prints the number of pending tasks and exits 0.
+- `python3 cli.py count` prints the number of pending tasks and exits 0.
 - No other files change. (`README.md`, `CHANGELOG.md`, and `tasks.py` are owned by other agents;
   stay out of them.)
 

modules/26-orchestrating-multiple-agents/lab/agent-prompts/agent-44-clear.md

@@ -17,8 +17,8 @@ You are working in this worktree only. Do not touch any other folder.
 
 **Acceptance criteria:**
 
-- `python cli.py clear` removes all tasks and prints `cleared`.
-- `python cli.py list` afterward shows `(no tasks yet)`.
+- `python3 cli.py clear` removes all tasks and prints `cleared`.
+- `python3 cli.py list` afterward shows `(no tasks yet)`.
 
 When done, commit your work on this branch with a message referencing #44, then push the branch. Stop
 there; the human opens and reviews the PR, and should expect a conflict against `feature/42-count` at