feat: 이메일 폴더 필터링 — 테크니컬코리아/Gmail/개인 지정 가능

"테크니컬코리아 메일만" → Technicalkorea 폴더만 검색
"구글 메일" → Gmail만, "개인 메일" → INBOX만
폴더 미지정 시 전체 검색 유지

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

nanoclaude/tools/email_tool.py

@@ -79,8 +79,8 @@ def _connect():
     return conn
 
 
-async def search(query: str = "", days: int = 7) -> dict:
-    """전체 폴더에서 최근 메일 검색."""
+async def search(query: str = "", days: int = 7, folder: str = "") -> dict:
+    """메일 검색. folder 지정 시 해당 폴더만, 없으면 전체."""
     try:
         conn = _connect()
         if not conn:
@@ -92,10 +92,11 @@ async def search(query: str = "", days: int = 7) -> dict:
         else:
             criteria = f"(SINCE {since})"
 
+        search_folders = [folder] if folder else FOLDERS
         all_results = []
         failed_folders = []
 
-        for folder in FOLDERS:
+        for folder in search_folders:
             try:
                 conn.select(folder, readonly=True)
                 _, data = conn.search(None, criteria)

nanoclaude/tools/registry.py

@@ -83,6 +83,7 @@ async def _exec_email(operation: str, params: dict) -> dict:
         return await email_tool.search(
             params.get("query", ""),
             params.get("days", 7),
+            params.get("folder", ""),
         )
     elif operation == "read":
         return await email_tool.read(params.get("uid", ""))