ci(ai-review): add --bare flag to prevent CLAUDE.md pollution in reviews

Review prompt already contains self-contained CCS-specific rules.
Loading project CLAUDE.md caused dev-oriented rules (no-emoji, quality
gates, branching) to leak into review output. --bare makes the review
prompt the sole source of truth and saves ~2K tokens per run.

.github/workflows/ai-review.yml

@@ -277,6 +277,7 @@ jobs:
             - Use simple, single-purpose bash commands only
 
           claude_args: |
+            --bare
             --model ${{ env.REVIEW_MODEL }}
             --allowedTools "Edit,Glob,Grep,LS,Read,Write,Bash(gh pr diff *),Bash(gh pr view *),Bash(gh issue view *),Bash(git diff *),Bash(git log *),Bash(git status *),Bash(cat *),Bash(ls *)"