merge: merge origin/gamma/refactor and origin/feature/teamhoa/r05-r06 into feature/delta-team/epic-R04

core/history.py

@@ -16,8 +16,6 @@ from datetime import datetime
 from pathlib import Path
 from typing import Any, Dict, List
 
-from ..config import HISTORY_DIR
-
 
 def new_session_id() -> str:
     return datetime.now().strftime("%Y%m%d-%H%M%S-%f")[:-3]
@@ -66,7 +64,9 @@ def save_conversation(
         "outputs": list(outputs or []),
         "messages": messages,
     }
-    path.write_text(json.dumps(payload, ensure_ascii=False, indent=2), encoding="utf-8")
+    # R06-T02: atomic write - see infrastructure/persistence/json/atomic_write.py.
+    from ..infrastructure.persistence.json.atomic_write import write_json
+    write_json(path, payload)
     return path
 
 
@@ -78,15 +78,19 @@ def delete_conversation(path) -> None:
 
 
 def rename_conversation(path, new_title: str) -> None:
+    from ..infrastructure.persistence.json.atomic_write import write_json
+
     data = load_conversation(path)
     data["title"] = new_title
-    Path(path).write_text(json.dumps(data, ensure_ascii=False, indent=2), encoding="utf-8")
+    write_json(Path(path), data)
 
 
 def set_pinned(path, pinned: bool) -> None:
+    from ..infrastructure.persistence.json.atomic_write import write_json
+
     data = load_conversation(path)
     data["pinned"] = bool(pinned)
-    Path(path).write_text(json.dumps(data, ensure_ascii=False, indent=2), encoding="utf-8")
+    write_json(Path(path), data)
 
 
 def load_conversation(path: Path) -> Dict[str, Any]:
@@ -111,13 +115,16 @@ def _matches_query(query: str, title: str, messages: List[Dict[str, Any]]) -> bo
     return False
 
 
-def list_conversations(directory: Path = HISTORY_DIR, query: str = "") -> List[Dict[str, Any]]:
+def list_conversations(directory: Optional[Path] = None, query: str = "") -> List[Dict[str, Any]]:
     """List saved conversations, most recent first (pinned always on top).
 
     ``query`` (from the sidebar's search box), when non-empty, keeps only
     conversations whose title OR any message's content contains it
     (case-insensitive) — since every file is already parsed to build the
     metadata below, this search costs no extra I/O over listing alone."""
+    if directory is None:
+        from ..config import HISTORY_DIR
+        directory = HISTORY_DIR
     if not directory or not directory.exists():
         return []
     q = (query or "").strip().lower()