Cleanup: remove redundant files, add comprehensive tests

Deleted:
- install.bat (Windows-only, use pip directly)
- test_message_order.py (outdated, replaced by pytest)
- test_tool_call_flow.py (outdated documentation-style test)

Added tests (57 total, all passing):
- test_embedded_db.py: SQLite database operations (11 tests)
- test_tool_limiter.py: tool call limiting logic (14 tests)
- test_memory_tools.py: tool definitions validation (17 tests)

tests/test_core/test_embedded_db.py

@@ -0,0 +1,162 @@
+"""嵌入式数据库测试"""
+
+import pytest
+import tempfile
+import os
+from graph_memory_tui.core.embedded_db import EmbeddedGraphDB
+
+
+@pytest.fixture
+def db():
+    """创建临时数据库用于测试"""
+    with tempfile.NamedTemporaryFile(suffix='.db', delete=False) as f:
+        db_path = f.name
+    
+    db = EmbeddedGraphDB(db_path)
+    yield db
+    
+    db.close()
+    os.unlink(db_path)
+
+
+def test_db_init(db):
+    """测试数据库初始化"""
+    assert db.conn is not None
+    assert db.db_path.exists()
+
+
+def test_commit_and_recall(db):
+    """测试写入和检索记忆"""
+    result = db.commit(
+        triplets=[
+            {"subject": "用户", "relation": "喜欢", "object": "Python"},
+            {"subject": "用户", "relation": "正在学习", "object": "AI"}
+        ],
+        session_id="test-session",
+        turn_id=1
+    )
+    
+    assert result["created_entities"] >= 2
+    assert result["created_relations"] >= 2
+
+
+def test_recall_with_keywords(db):
+    """测试关键词检索"""
+    db.commit(
+        triplets=[
+            {"subject": "项目A", "relation": "使用技术", "object": "React"}
+        ]
+    )
+    
+    result = db.recall("React")
+    assert len(result["entities"]) > 0
+
+
+def test_recall_empty_keywords(db):
+    """测试空关键词检索"""
+    db.commit(
+        triplets=[
+            {"subject": "测试实体", "relation": "关系", "object": "测试对象"}
+        ]
+    )
+    
+    result = db.recall("")
+    assert len(result["entities"]) > 0
+
+
+def test_purge_soft(db):
+    """测试软删除"""
+    db.commit(
+        triplets=[
+            {"subject": "待删除", "relation": "测试", "object": "删除内容"}
+        ]
+    )
+    
+    result = db.purge(
+        criteria={"source": "待删除"},
+        mode="soft"
+    )
+    
+    assert result["deleted"] >= 0
+    assert result["mode"] == "soft"
+
+
+def test_introspect(db):
+    """测试状态查看"""
+    db.commit(
+        triplets=[
+            {"subject": "实体1", "relation": "关系", "object": "实体2"}
+        ]
+    )
+    
+    result = db.introspect()
+    
+    assert "entity_count" in result
+    assert "relation_count" in result
+    assert result["entity_count"] >= 1
+
+
+def test_archive(db):
+    """测试归档"""
+    result = db.archive(days=30)
+    assert "archived" in result
+
+
+def test_cleanup_dry_run(db):
+    """测试清理（预览模式）"""
+    result = db.cleanup(dry_run=True)
+    
+    assert result["dry_run"] is True
+    assert "deleted_relations" in result
+
+
+def test_multiple_triplets(db):
+    """测试批量写入"""
+    result = db.commit(
+        triplets=[
+            {"subject": "实体A", "relation": "关系1", "object": "实体B"},
+            {"subject": "实体B", "relation": "关系2", "object": "实体C"},
+            {"subject": "实体C", "relation": "关系3", "object": "实体A"}
+        ],
+        session_id="batch-test",
+        turn_id=1
+    )
+    
+    assert result["created_entities"] >= 3
+    assert result["created_relations"] == 3
+
+
+def test_entity_mention_count(db):
+    """测试实体提及次数增加"""
+    db.commit(
+        triplets=[{"subject": "热门实体", "relation": "关系", "object": "对象1"}]
+    )
+    db.commit(
+        triplets=[{"subject": "热门实体", "relation": "关系", "object": "对象2"}]
+    )
+    
+    result = db.recall("热门实体")
+    entity = next((e for e in result["entities"] if e["name"] == "热门实体"), None)
+    
+    assert entity is not None
+    assert entity["mention_count"] >= 2
+
+
+def test_close_and_context_manager():
+    """测试关闭和上下文管理器"""
+    with tempfile.NamedTemporaryFile(suffix='.db', delete=False) as f:
+        db_path = f.name
+    
+    try:
+        with EmbeddedGraphDB(db_path) as db:
+            db.commit(
+                triplets=[{"subject": "测试", "relation": "上下文", "object": "管理器"}]
+            )
+            assert db.conn is not None
+        
+        with EmbeddedGraphDB(db_path) as db:
+            result = db.introspect()
+            assert result["entity_count"] >= 1
+    finally:
+        if os.path.exists(db_path):
+            os.unlink(db_path)