fix(labs): update learner working-dir path to ~/ai-workflow-course after repo rename

The repo was renamed to ai-workflow-course, so the course's working-directory
convention should match. Replace ~/workflow-course (and /home/you/...,
/ABSOLUTE/PATH/TO/...) with ~/ai-workflow-course throughout modules/ and capstone/
(20 files, incl. the MCP config example). Safe replacement — already-correct
ai-workflow-course references are untouched.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TfzV5QvtPDz8LJS3Pu5VLT

modules/02-version-control-as-a-safety-net/README.md

@@ -153,7 +153,7 @@ and your AI assistant.
 1. In your project folder, initialize the repo and make the first commit:
 
    ```bash
-   cd ~/workflow-course/tasks-app
+   cd ~/ai-workflow-course/tasks-app
    git init -b main           # start the repo with its first branch named "main" (Git 2.28+)
    git status                 # everything shows as "untracked" — Git sees the files but isn't saving them yet
    ```