Update learner working-dir path to ~/ai-workflow-course after rename (#73)

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

modules/26-orchestrating-multiple-agents/README.md

@@ -115,7 +115,7 @@ Each agent gets **its own worktree on its own branch tied to its own issue.** Th
 keeps a fleet legible:
 
 ```
-~/workflow-course/
+~/ai-workflow-course/
   tasks-app/            ← main worktree, on main (the integration point — no agent works here)
   tasks-app-42-count/   ← worktree for issue #42, branch feature/42-count, agent A
   tasks-app-43-docs/    ← worktree for issue #43, branch feature/43-docs,  agent B
@@ -336,9 +336,9 @@ thing you're waiting on.
 5. In each worktree, commit the agent's work on its own branch and push it:
 
    ```bash
-   cd ~/workflow-course/tasks-app-42-count && git add . && git commit -m "Add count command (#42)" && git push -u origin feature/42-count
-   cd ~/workflow-course/tasks-app-43-docs  && git add . && git commit -m "Document commands, add changelog (#43)" && git push -u origin feature/43-docs
-   cd ~/workflow-course/tasks-app-44-clear && git add . && git commit -m "Add clear command (#44)" && git push -u origin feature/44-clear
+   cd ~/ai-workflow-course/tasks-app-42-count && git add . && git commit -m "Add count command (#42)" && git push -u origin feature/42-count
+   cd ~/ai-workflow-course/tasks-app-43-docs  && git add . && git commit -m "Document commands, add changelog (#43)" && git push -u origin feature/43-docs
+   cd ~/ai-workflow-course/tasks-app-44-clear && git add . && git commit -m "Add clear command (#44)" && git push -u origin feature/44-clear
    ```
 
 ### Part C — Fan in through the funnel
@@ -355,7 +355,7 @@ thing you're waiting on.
 
    ```bash
    # via the forge UI, or locally:
-   cd ~/workflow-course/tasks-app && git switch main
+   cd ~/ai-workflow-course/tasks-app && git switch main
    git merge feature/42-count      # clean
    git merge feature/43-docs       # clean — different files entirely
    ```