refactor: centralize cron session metadata keys

nanobot/session/keys.py

@@ -0,0 +1,12 @@
+"""Shared session key constants and helpers."""
+
+from __future__ import annotations
+
+UNIFIED_SESSION_KEY = "unified:default"
+
+
+def session_key_for_channel(channel: str, chat_id: str, *, unified_session: bool = False) -> str:
+    """Return the session key for a channel/chat pair."""
+    if unified_session:
+        return UNIFIED_SESSION_KEY
+    return f"{channel}:{chat_id}"

nanobot/session/manager.py

@@ -14,6 +14,7 @@ from typing import Any
 from loguru import logger
 
 from nanobot.config.paths import get_legacy_sessions_dir
+from nanobot.session.metadata import SESSION_ROUTING_METADATA_KEY
 from nanobot.utils.helpers import (
     ensure_dir,
     estimate_message_tokens,
@@ -36,7 +37,7 @@ _FORK_VOLATILE_METADATA_KEYS = {
     "pending_user_turn",
     "runtime_checkpoint",
     "thread_goal",
-    "_routing_context",
+    SESSION_ROUTING_METADATA_KEY,
     "title",
     "title_user_edited",
 }

nanobot/session/metadata.py

@@ -0,0 +1,3 @@
+"""Shared session metadata keys."""
+
+SESSION_ROUTING_METADATA_KEY = "_routing_context"

nanobot/session/routing.py

@@ -7,8 +7,7 @@ from typing import Any, Mapping
 from nanobot.bus.events import InboundMessage
 from nanobot.cron.automation import is_automation_turn
 from nanobot.session.manager import Session
-
-SESSION_ROUTING_METADATA_KEY = "_routing_context"
+from nanobot.session.metadata import SESSION_ROUTING_METADATA_KEY
 
 _ROUTING_METADATA_KEYS = {
     "chat_type",