fix(session): preserve complete transcripts

tests/test_nanobot_facade.py

@@ -35,7 +35,6 @@ from nanobot.runtime_context import (
     RuntimeContextBlock,
     append_runtime_context,
 )
-from nanobot.session.manager import FILE_MAX_MESSAGES
 from nanobot.utils.llm_runtime import runtime_from_provider_snapshot
 
 
@@ -1451,7 +1450,7 @@ async def test_sessions_ingest_imports_transcript_without_running_model(tmp_path
 
 
 @pytest.mark.asyncio
-async def test_sessions_ingest_archives_overflow_at_persistence_boundary(tmp_path):
+async def test_sessions_ingest_preserves_full_transcript(tmp_path):
     config_path = _write_config(tmp_path)
     bot = Nanobot.from_config(config_path, workspace=tmp_path)
 
@@ -1459,16 +1458,14 @@ async def test_sessions_ingest_archives_overflow_at_persistence_boundary(tmp_pat
         "sdk:overflow",
         [
             {"role": "user", "content": f"message-{index}"}
-            for index in range(FILE_MAX_MESSAGES + 1)
+            for index in range(2_001)
         ],
     )
 
-    assert len(snapshot.messages) == FILE_MAX_MESSAGES
-    assert snapshot.messages[0]["content"] == "message-1"
-    history = bot.memory.read_history(session_key="sdk:overflow")
-    assert len(history) == 1
-    assert "[RAW] 1 messages" in history[0]["content"]
-    assert "message-0" in history[0]["content"]
+    assert len(snapshot.messages) == 2_001
+    assert snapshot.messages[0]["content"] == "message-0"
+    assert snapshot.messages[-1]["content"] == "message-2000"
+    assert bot.memory.read_history(session_key="sdk:overflow") == []
 
 
 @pytest.mark.asyncio