feat: (literally) "enhance" functionality with new parameters and improved image processing

tests/test_agent_tools.py

@@ -91,6 +91,41 @@ def test_click_supports_directional_offsets(tmp_path: Path, monkeypatch) -> None
     assert click_result["clicked"] == {"x": 110, "y": 102}
 
 
+def test_enhance_defaults_to_small_ui_preset(tmp_path: Path, monkeypatch) -> None:
+    agent = _build_agent(tmp_path, monkeypatch)
+    result = agent._tool_enhance({"coordinate": {"x": 100, "y": 120}})
+
+    assert result["ok"] is True
+    meta = result["meta"]
+    assert meta["region"] == "small"
+    assert meta["mode"] == "ui"
+    assert meta["scale"] == 4
+    assert Path(meta["path"]).exists()
+    assert meta["target_pixel"]["x"] >= 0
+    assert meta["target_pixel"]["y"] >= 0
+
+
+def test_enhance_supports_text_mode_and_scale_clamp(tmp_path: Path, monkeypatch) -> None:
+    agent = _build_agent(tmp_path, monkeypatch)
+    result = agent._tool_enhance(
+        {
+            "coordinate": {"x": -99, "y": 9999},
+            "region": "medium",
+            "mode": "text",
+            "scale": 99,
+        }
+    )
+
+    assert result["ok"] is True
+    meta = result["meta"]
+    assert meta["region"] == "medium"
+    assert meta["mode"] == "text"
+    assert meta["scale"] == 6
+    assert meta["requested_coord"] == {"x": -99, "y": 9999}
+    assert meta["source_coord"] == {"x": 0, "y": 719}
+    assert Path(meta["path"]).exists()
+
+
 def test_press_key_supports_hotkey_combo(tmp_path: Path, monkeypatch) -> None:
     agent = _build_agent(tmp_path, monkeypatch)
     result = agent._tool_press_key({"key": "meta+r"})