Add Monte Carlo simulator, game metrics and sim CLI (Phase 5)

`dojo sim` plays seeded games over a scenario matrix (variant, players,
Kiai bonus, start position, bot lineup) in parallel, prints a summary per
scenario and optionally writes one CSV row per game. Metrics are replayed
from the event log. Plan updated with the Phase 5 baseline.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

tests/test_sim.py

@@ -0,0 +1,58 @@
+from pathlib import Path
+
+import pytest
+
+from dojo.sim import BoardFiles, Scenario, matrix, run
+
+BOARD = Path(__file__).parent.parent / "board"
+FILES = BoardFiles(BOARD / "quadrant.txt", BOARD / "legend.toml")
+LINEUP = ("balanced", "random")
+
+
+def test_matrix_crosses_every_axis() -> None:
+    scenarios = matrix(["A", "B"], [3, 4], [2, 1], [0], [LINEUP])
+
+    assert len(scenarios) == 8
+    assert scenarios[0].name == "A p3 kiai+2 start0 balanced,random"
+    assert scenarios[-1].config.kiai_bonus == 1
+    assert scenarios[-1].config.brown_requires_kumite
+
+
+def test_lineup_fills_the_seats_and_rotates_each_game() -> None:
+    scenario = Scenario("A", 3, 2, 0, LINEUP)
+
+    assert scenario.seating(0) == ("balanced", "random", "balanced")
+    assert scenario.seating(1) == ("random", "balanced", "balanced")
+    assert scenario.seating(3) == scenario.seating(0)
+
+
+@pytest.mark.parametrize(
+    ("variant", "players", "lineup", "message"),
+    [
+        ("C", 4, LINEUP, "unknown variant"),
+        ("A", 4, ("balanced", "cheater"), "unknown bots"),
+        ("A", 4, (), "unknown bots"),
+        ("A", 9, LINEUP, "supported range"),
+    ],
+)
+def test_invalid_scenarios_are_rejected(
+    variant: str, players: int, lineup: tuple[str, ...], message: str
+) -> None:
+    with pytest.raises(ValueError, match=message):
+        Scenario(variant, players, 2, 0, lineup)
+
+
+def test_runs_are_reproducible_and_independent_of_worker_count() -> None:
+    scenarios = matrix(["A", "B"], [3], [2], [0], [LINEUP])
+
+    serial = run(FILES, scenarios, games=2, seed=5, jobs=1)
+    parallel = run(FILES, scenarios, games=2, seed=5, jobs=2)
+
+    assert serial == parallel
+    assert [(g.scenario, g.seed) for g in serial] == [
+        (scenarios[0].name, 5),
+        (scenarios[0].name, 6),
+        (scenarios[1].name, 5),
+        (scenarios[1].name, 6),
+    ]
+    assert serial[1].lineup == "random,balanced,balanced"