test(integration): Verify history persistence and AI context inclusion

tests/test_history_persistence.py

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+import pytest
+import tomli_w
+import tomllib
+from pathlib import Path
+from project_manager import load_project, save_project, default_project, entry_to_str
+
+def test_history_persistence_across_turns(tmp_path):
+    proj_path = tmp_path / "manual_slop.toml"
+    hist_path = tmp_path / "manual_slop_history.toml"
+    
+    # 1. Start project
+    proj = default_project("test-persistence")
+    save_project(proj, proj_path)
+    
+    # 2. Add a turn
+    proj = load_project(proj_path)
+    entry1 = {"role": "User", "content": "Hello", "ts": "2026-02-24T13:00:00"}
+    proj["discussion"]["discussions"]["main"]["history"].append(entry_to_str(entry1))
+    save_project(proj, proj_path)
+    
+    # Verify separation
+    with open(proj_path, "rb") as f:
+        p_disk = tomllib.load(f)
+    assert "discussion" not in p_disk
+    
+    with open(hist_path, "rb") as f:
+        h_disk = tomllib.load(f)
+    assert h_disk["discussions"]["main"]["history"] == ["@2026-02-24T13:00:00\nUser:\nHello"]
+    
+    # 3. Add another turn
+    proj = load_project(proj_path)
+    entry2 = {"role": "AI", "content": "Hi there!", "ts": "2026-02-24T13:01:00"}
+    proj["discussion"]["discussions"]["main"]["history"].append(entry_to_str(entry2))
+    save_project(proj, proj_path)
+    
+    # Verify persistence
+    with open(hist_path, "rb") as f:
+        h_disk = tomllib.load(f)
+    assert len(h_disk["discussions"]["main"]["history"]) == 2
+    assert h_disk["discussions"]["main"]["history"][1] == "@2026-02-24T13:01:00\nAI:\nHi there!"
+    
+    # 4. Reload and check
+    proj_final = load_project(proj_path)
+    assert len(proj_final["discussion"]["discussions"]["main"]["history"]) == 2