fix(workflow): quote path variables in workspace next-step examples (#2096)

Display examples showing 'cd $TARGET_PATH' and 'cd $WORKSPACE_PATH/repo1'
were unquoted, causing path splitting when project paths contain spaces
(e.g. Windows paths like C:\Users\First Last\...).

Quote all path variable references in user-facing guidance blocks so
the examples shown to users are safe to copy-paste directly.

The actual bash execution blocks (git worktree add, rm -rf, etc.) were
already correctly quoted — this fixes only the display examples.

Fixes #2088

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

get-shit-done/workflows/new-workspace.md

@@ -202,7 +202,7 @@ Workspace created: $TARGET_PATH
   Branch: $BRANCH_NAME
 
 Next steps:
-  cd $TARGET_PATH
+  cd "$TARGET_PATH"
   /gsd-new-project    # Initialize GSD in the workspace
 ```
 
@@ -215,7 +215,7 @@ Workspace created with $SUCCESS_COUNT of $TOTAL_COUNT repos: $TARGET_PATH
   Failed: repo3 (branch already exists), repo4 (not a git repo)
 
 Next steps:
-  cd $TARGET_PATH
+  cd "$TARGET_PATH"
   /gsd-new-project    # Initialize GSD in the workspace
 ```
 
@@ -225,7 +225,7 @@ Use AskUserQuestion:
 - header: "Initialize GSD"
 - question: "Would you like to initialize a GSD project in the new workspace?"
 - options:
-  - "Yes — run /gsd-new-project" → tell user to `cd $TARGET_PATH` first, then run `/gsd-new-project`
+  - "Yes — run /gsd-new-project" → tell user to `cd "$TARGET_PATH"` first, then run `/gsd-new-project`
   - "No — I'll set it up later" → done
 
 </process>

get-shit-done/workflows/remove-workspace.md

@@ -43,7 +43,7 @@ Cannot remove workspace "$WORKSPACE_NAME" — the following repos have uncommitt
   - repo2
 
 Commit or stash changes in these repos before removing the workspace:
-  cd $WORKSPACE_PATH/repo1
+  cd "$WORKSPACE_PATH/repo1"
   git stash   # or git commit
 ```