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_human_tui.py

@@ -0,0 +1,54 @@
+"""Tests for python/splendor/human.py TUI classes."""
+
+from __future__ import annotations
+
+import random
+
+from python.splendor.base import (
+    GEM_COLORS,
+    GameConfig,
+    PlayerState,
+    create_random_cards,
+    create_random_nobles,
+    new_game,
+)
+from python.splendor.bot import RandomBot
+from python.splendor.human import TuiHuman
+
+
+def _make_game(num_players: int = 2):
+    bots = [RandomBot(f"bot{i}") for i in range(num_players)]
+    cards = create_random_cards()
+    nobles = create_random_nobles()
+    config = GameConfig(cards=cards, nobles=nobles)
+    game = new_game(bots, config)
+    return game, bots
+
+
+def test_tui_human_choose_action_no_tty() -> None:
+    """Test TuiHuman returns None when not a TTY."""
+    random.seed(42)
+    game, _ = _make_game(2)
+    human = TuiHuman("test")
+    # In test environment, stdout is not a TTY
+    result = human.choose_action(game, game.players[0])
+    assert result is None
+
+
+def test_tui_human_choose_discard_no_tty() -> None:
+    """Test TuiHuman returns empty discards when not a TTY."""
+    random.seed(42)
+    game, _ = _make_game(2)
+    human = TuiHuman("test")
+    result = human.choose_discard(game, game.players[0], 2)
+    assert result == dict.fromkeys(GEM_COLORS, 0)
+
+
+def test_tui_human_choose_noble_no_tty() -> None:
+    """Test TuiHuman returns first noble when not a TTY."""
+    random.seed(42)
+    game, _ = _make_game(2)
+    human = TuiHuman("test")
+    nobles = game.available_nobles[:2]
+    result = human.choose_noble(game, game.players[0], nobles)
+    assert result == nobles[0]