fix(rules): scale reposition and drag distance with the margin

PF1e (APG Reposition / Drag): "For every 5 by which your attack exceeds
your opponent's CMD, you can move/drag the target an additional 5 feet."
Both handlers now walk 1 + margin//5 cells along the chosen (or auto-picked)
direction, stopping at the first obstacle or occupied square, mirroring the
bull rush scaling. README updated.

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

tests/test_maneuvers.py

@@ -382,6 +382,55 @@ def test_steal_nothing_to_steal() -> None:
     assert "nothing stealable" in engine._transcript[-1]
 
 
+def test_reposition_distance_scales_with_margin() -> None:
+    # APG Reposition: "For every 5 by which your attack exceeds your
+    # opponent's CMD, you can move the target an additional 5 feet."
+    # a CMB 2 vs b CMD 12: d20 17 -> total 19, margin 7 -> 2 cells.
+    a = make_state(make_combatant("a", attack_bonus=2), "players", (1, 1))
+    b = make_state(make_combatant("b"), "monsters", (1, 2))
+    engine = make_engine([1, 17], [a, b])  # leading 1: AoO auto-miss
+    engine._execute_maneuver(a, b, "reposition", direction=(0, 1))
+    assert b.pos == (1, 4)
+
+
+def test_reposition_stops_at_obstacle() -> None:
+    # The extra cell is blocked by c: the walk stops on (1, 3), the last
+    # free square ("You cannot move a creature into a square that is
+    # occupied by a solid object or obstacle").
+    a = make_state(make_combatant("a", attack_bonus=2), "players", (1, 1))
+    b = make_state(make_combatant("b"), "monsters", (1, 2))
+    c = make_state(make_combatant("c"), "monsters", (1, 4))
+    engine = make_engine([1, 17], [a, b, c])
+    engine._execute_maneuver(a, b, "reposition", direction=(0, 1))
+    assert b.pos == (1, 3)
+    assert c.pos == (1, 4)
+
+
+def test_drag_distance_scales_with_margin() -> None:
+    # APG Drag: "For every 5 by which your attack exceeds your opponent's
+    # CMD, you can drag the target back an additional 5 feet." Margin 7 ->
+    # two 5-ft swaps along the straight line: b (1,2)->(1,4), a (1,1)->(1,3).
+    a = make_state(make_combatant("a", attack_bonus=2), "players", (1, 1))
+    b = make_state(make_combatant("b"), "monsters", (1, 2))
+    engine = make_engine([1, 17], [a, b])
+    engine._execute_maneuver(a, b, "drag")
+    assert b.pos == (1, 4)
+    assert a.pos == (1, 3)
+
+
+def test_drag_stops_at_obstacle() -> None:
+    # Second drag cell (1, 4) is occupied: the drag ends after the first
+    # 5 ft ("If there is another creature in the way of your movement, the
+    # drag ends adjacent to that creature").
+    a = make_state(make_combatant("a", attack_bonus=2), "players", (1, 1))
+    b = make_state(make_combatant("b"), "monsters", (1, 2))
+    c = make_state(make_combatant("c"), "monsters", (1, 4))
+    engine = make_engine([1, 17], [a, b, c])
+    engine._execute_maneuver(a, b, "drag")
+    assert b.pos == (1, 3)
+    assert a.pos == (1, 2)
+
+
 def test_reposition_moves_to_first_free_neighbor() -> None:
     a_spec = make_combatant("a", attack_bonus=2)
     b_spec = make_combatant("b")