chore(rebar): Pier_T_rebar 작업 폴더 초기 구성 및 외부 의존 파일 통합

- Code\rebar_pipeline, review_pipeline, pier-program을 정션에서 실제 폴더로 전환
- Code\rhino_mcp 및 CLAUDE_rhino배경.md 추가, .mcp.json은 PYTHONPATH로 새 위치 사용
- pier-program 내부 .git 제거(이력은 backup\pier-program_20261028.bundle에 보관)
- worktree 가이드 반영(CLAUDE.local.md, HANDOFF.md)
- D:\Rhino-MCP 경로 참조를 새 위치로 치환

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

.hmcmkit/tools/snapshot.py

@@ -0,0 +1,38 @@
+import os
+import sys
+import shutil
+import datetime
+
+def create_snapshot(file_path):
+    """
+    Creates a timestamped backup of the given file in .hmcmkit/backups/
+    """
+    if not os.path.exists(file_path):
+        print(f"❌ Error: File not found: {file_path}")
+        return None
+
+    # Determine paths
+    hmcmkit_root = ".hmcmkit"
+    backup_dir = os.path.join(hmcmkit_root, "backups")
+    os.makedirs(backup_dir, exist_ok=True)
+
+    # Generate timestamped name
+    timestamp = datetime.datetime.now().strftime("%Y%m%d_%H%M%S")
+    filename = os.path.basename(file_path)
+    backup_name = f"{timestamp}_{filename}"
+    backup_path = os.path.join(backup_dir, backup_name)
+
+    try:
+        shutil.copy2(file_path, backup_path)
+        print(f"📦 Snapshot created: {backup_path}")
+        return backup_path
+    except Exception as e:
+        print(f"❌ Snapshot failed: {e}")
+        return None
+
+if __name__ == "__main__":
+    if len(sys.argv) < 2:
+        print("Usage: python snapshot.py <file_path>")
+        sys.exit(1)
+        
+    create_snapshot(sys.argv[1])