feat(adapter): scaffold balabit data adapter package

tests/test_balabit_adapter.py

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+"""Tests for Balabit Mouse Dynamics Challenge data adapter."""
+from __future__ import annotations
+
+from pathlib import Path
+
+import pytest
+
+
+def test_module_exports():
+    """The adapter module must export the public functions used by CLI."""
+    from ai_mouse.data_adapters import balabit
+    assert hasattr(balabit, "parse_session_csv")
+    assert hasattr(balabit, "segment_by_clicks")
+    assert hasattr(balabit, "filter_segments")
+    assert hasattr(balabit, "process_session")
+    assert hasattr(balabit, "MouseEvent")
+    assert hasattr(balabit, "Segment")
+
+
+def test_mouse_event_dataclass():
+    """MouseEvent has expected fields."""
+    from ai_mouse.data_adapters.balabit import MouseEvent
+    e = MouseEvent(t_ms=100, button="NoButton", state="Move", x=300, y=400)
+    assert e.t_ms == 100
+    assert e.state == "Move"
+    assert e.x == 300
+
+
+def test_segment_dataclass():
+    """Segment has expected fields."""
+    from ai_mouse.data_adapters.balabit import MouseEvent, Segment
+    events = [MouseEvent(t_ms=0, button="NoButton", state="Move", x=10, y=20)]
+    s = Segment(events=events, click_x=100, click_y=200, click_t_ms=500, session_id="user1_s1")
+    assert s.events == events
+    assert s.click_x == 100
+    assert s.session_id == "user1_s1"