refactor: bind cron jobs to origin sessions

tests/agent/test_loop_save_turn.py

@@ -12,7 +12,6 @@ from nanobot.cron.session_turns import CRON_HISTORY_META, CRON_TRIGGER_META
 from nanobot.providers.base import LLMResponse
 from nanobot.session.goal_state import GOAL_STATE_KEY
 from nanobot.session.manager import Session, SessionManager
-from nanobot.session.routing import SESSION_ROUTING_METADATA_KEY
 from nanobot.session.turn_continuation import (
     INTERNAL_CONTINUATION_META,
     INTERNAL_CONTINUATION_RUN_STARTED_AT_META,
@@ -864,12 +863,6 @@ async def test_process_message_uses_context_chat_id_for_runtime_prompt(tmp_path:
     assert result.chat_id == "thread-777"
     assert loop.context.build_messages.call_args.kwargs["chat_id"] == "parent-456"
     assert loop._run_agent_loop.call_args.kwargs["chat_id"] == "thread-777"
-    session = loop.sessions.get_or_create("discord:parent-456:thread:thread-777")
-    assert session.metadata[SESSION_ROUTING_METADATA_KEY] == {
-        "channel": "discord",
-        "chat_id": "thread-777",
-        "metadata": {"context_chat_id": "parent-456"},
-    }
 
 
 @pytest.mark.asyncio

tests/agent/test_session_manager_history.py

@@ -1,5 +1,4 @@
 from nanobot.session.manager import Session, SessionManager
-from nanobot.session.routing import SESSION_ROUTING_METADATA_KEY
 
 
 def _assert_no_orphans(history: list[dict]) -> None:
@@ -433,11 +432,6 @@ def test_fork_session_before_user_index_copies_only_prefix(tmp_path):
     source.metadata["webui"] = True
     source.metadata["title"] = "Old title"
     source.metadata["goal_state"] = {"status": "active", "objective": "do not inherit"}
-    source.metadata[SESSION_ROUTING_METADATA_KEY] = {
-        "channel": "websocket",
-        "chat_id": "source",
-        "metadata": {},
-    }
     source.add_message("user", "round1")
     source.add_message("assistant", "answer1")
     source.add_message("user", "round2 fork me")
@@ -456,7 +450,6 @@ def test_fork_session_before_user_index_copies_only_prefix(tmp_path):
     assert forked.metadata["webui"] is True
     assert "title" not in forked.metadata
     assert "goal_state" not in forked.metadata
-    assert SESSION_ROUTING_METADATA_KEY not in forked.metadata
     saved = manager.read_session_file("websocket:fork")
     assert [m["content"] for m in saved["messages"]] == ["round1", "answer1"]