Add comprehensive test suite achieving 99% code coverage

Added 35 test files with 502 tests covering all Python modules including
API routes, ORM models, splendor game logic/TUI, heater controller,
weather service, NixOS installer, ZFS dataset management, and utilities.
Coverage improved from 11% to 99% (2540/2564 statements covered).

https://claude.ai/code/session_01SVzgLDUS1Cdc4eh1ijETTh

tests/test_splendor_simulat.py

@@ -0,0 +1,88 @@
+"""Tests for python/splendor/simulat.py."""
+
+from __future__ import annotations
+
+import json
+import random
+from pathlib import Path
+from unittest.mock import patch
+
+from python.splendor.base import load_cards, load_nobles
+from python.splendor.simulat import main
+
+
+def test_simulat_main(tmp_path: Path) -> None:
+    """Test simulat main function with mock game data."""
+    random.seed(42)
+
+    # Create temporary game data
+    cards_dir = tmp_path / "game_data" / "cards"
+    nobles_dir = tmp_path / "game_data" / "nobles"
+    cards_dir.mkdir(parents=True)
+    nobles_dir.mkdir(parents=True)
+
+    cards = []
+    for tier in (1, 2, 3):
+        for color in ("white", "blue", "green", "red", "black"):
+            cards.append({
+                "tier": tier,
+                "points": tier,
+                "color": color,
+                "cost": {"white": tier, "blue": 0, "green": 0, "red": 0, "black": 0, "gold": 0},
+            })
+    (cards_dir / "default.json").write_text(json.dumps(cards))
+
+    nobles = [
+        {"name": f"Noble {i}", "points": 3, "requirements": {"white": 3, "blue": 3, "green": 3}}
+        for i in range(5)
+    ]
+    (nobles_dir / "default.json").write_text(json.dumps(nobles))
+
+    # Patch Path(__file__).parent to point to tmp_path
+    fake_parent = tmp_path
+    with patch("python.splendor.simulat.Path") as mock_path_cls:
+        mock_path_cls.return_value.__truediv__ = Path.__truediv__
+        mock_file = mock_path_cls().__truediv__("simulat.py")
+        # Make Path(__file__).parent return tmp_path
+        mock_path_cls.reset_mock()
+        mock_path_instance = mock_path_cls.return_value
+        mock_path_instance.parent = fake_parent
+
+        # Actually just patch load_cards and load_nobles
+    cards_data = load_cards(cards_dir / "default.json")
+    nobles_data = load_nobles(nobles_dir / "default.json")
+
+    with (
+        patch("python.splendor.simulat.load_cards", return_value=cards_data),
+        patch("python.splendor.simulat.load_nobles", return_value=nobles_data),
+    ):
+        main()
+
+
+def test_load_cards_and_nobles(tmp_path: Path) -> None:
+    """Test that load_cards and load_nobles work correctly."""
+    cards_dir = tmp_path / "cards"
+    cards_dir.mkdir()
+
+    cards = [
+        {
+            "tier": 1,
+            "points": 0,
+            "color": "white",
+            "cost": {"white": 1, "blue": 0, "green": 0, "red": 0, "black": 0, "gold": 0},
+        }
+    ]
+    cards_file = cards_dir / "default.json"
+    cards_file.write_text(json.dumps(cards))
+    loaded = load_cards(cards_file)
+    assert len(loaded) == 1
+    assert loaded[0].color == "white"
+
+    nobles_dir = tmp_path / "nobles"
+    nobles_dir.mkdir()
+    nobles = [{"name": "Noble A", "points": 3, "requirements": {"white": 3}}]
+    nobles_file = nobles_dir / "default.json"
+    nobles_file.write_text(json.dumps(nobles))
+    loaded_nobles = load_nobles(nobles_file)
+    assert len(loaded_nobles) == 1
+    assert loaded_nobles[0].name == "Noble A"