chore: initialize git repo, add matplotlib dep, extend config

- Add .gitignore for Python/data/models
- Add matplotlib>=3.8.0 for eval plots
- Add PretrainConfig, FinetuneConfig, BalabitAdapterConfig, EvalConfig dataclasses

tests/test_scroll_collector.py

@@ -0,0 +1,65 @@
+"""Tests for scroll collection state and target generation."""
+from __future__ import annotations
+
+import pytest
+
+from ai_mouse.scroll.collector import ScrollCollector
+
+
+class TestNextTarget:
+    def test_target_mode_distance_range(self):
+        sc = ScrollCollector(mode="target", count=10, page_height=10000, viewport_height=900)
+        for _ in range(20):
+            result = sc.next_target(current_scrollY=2000)
+            dist = abs(result["target_scrollY"] - 2000)
+            assert 500 <= dist <= 3000
+            assert result["direction"] in ("up", "down")
+
+    def test_fast_mode_distance_range(self):
+        sc = ScrollCollector(mode="fast", count=10, page_height=10000, viewport_height=900)
+        for _ in range(20):
+            result = sc.next_target(current_scrollY=5000)
+            dist = abs(result["target_scrollY"] - 5000)
+            assert 3000 <= dist <= 8000
+
+    def test_precise_mode_distance_range(self):
+        sc = ScrollCollector(mode="precise", count=10, page_height=10000, viewport_height=900)
+        for _ in range(20):
+            result = sc.next_target(current_scrollY=3000)
+            dist = abs(result["target_scrollY"] - 3000)
+            assert 200 <= dist <= 800
+
+    def test_target_within_page_bounds(self):
+        sc = ScrollCollector(mode="target", count=10, page_height=10000, viewport_height=900)
+        result = sc.next_target(current_scrollY=1000)
+        assert 0 <= result["target_scrollY"] <= 10000
+        result = sc.next_target(current_scrollY=9000)
+        assert 0 <= result["target_scrollY"] <= 10000
+
+    def test_success_zone_by_mode(self):
+        sc = ScrollCollector(mode="target", count=10, page_height=10000)
+        assert sc.success_radius == 80
+        sc2 = ScrollCollector(mode="fast", count=10, page_height=10000)
+        assert sc2.success_radius == 120
+        sc3 = ScrollCollector(mode="precise", count=10, page_height=10000)
+        assert sc3.success_radius == 40
+
+    def test_target_always_reachable(self):
+        """Target must always be reachable: user can scroll to bring it into success zone."""
+        sc = ScrollCollector(mode="target", count=10, page_height=10000, viewport_height=900)
+        viewport_center = 450  # 900 / 2
+        max_scroll_top = 10000 - 900  # 9100
+
+        for current in [0, 100, 500, 2000, 5000, 8000, 9000]:
+            for _ in range(10):
+                result = sc.next_target(current_scrollY=current)
+                target = result["target_scrollY"]
+                # The scrollTop needed to bring target into viewport center
+                needed_scroll = target - viewport_center + 25
+                # Must be achievable (0 <= needed_scroll <= max_scroll_top)
+                # With success_radius=80, there's a window, not exact match needed
+                reachable_min = viewport_center - sc.success_radius
+                reachable_max = max_scroll_top + viewport_center + sc.success_radius
+                assert reachable_min <= target <= reachable_max, (
+                    f"Target {target} not reachable from scrollY={current}"
+                )