refactor(code-review): add rename detection to git change discovery

Step-01 substep-4:
- Use git diff -M to detect renamed/moved files
- Include deleted, renamed files in git_changed_files
- Adversarial reviewer needs to see deletions (e.g., critical code removed)
- Downstream steps will handle these appropriately (documented in implementation-notes)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

src/modules/bmm/workflows/4-implementation/code-review/steps/step-01-load-story.md

@@ -70,11 +70,11 @@ Check if git repository exists.
 
 ```bash
 git status --porcelain
-git diff --name-only
-git diff --cached --name-only
+git diff -M --name-only
+git diff -M --cached --name-only
 ```
 
-Compile `git_changed_files` = union of modified, staged, and new files.
+Compile `git_changed_files` = union of modified, staged, new, deleted, and renamed files.
 
 ### 5. Cross-Reference Story vs Git