mechanic: move word lists to data files

The word lists (monsters, spells, equipment, races, classes, titles and
so on) now live in pqcli/data/*.json instead of pqcli/config.py. A
GameData object loaded at startup is passed to the simulation and UIs.

Users can replace any list by putting NAME.json in
$XDG_CONFIG_HOME/pqcli/data/ or a directory given with --data-dir.
--dump-data DIR copies the built-in files out for editing. Malformed
files are reported and pqcli exits before starting the UI.

Combat task descriptions come from the new combat_verbs list, with
{target} standing for the enemy. The built-in list holds only "Executing
{target}", and a single verb consumes no random roll, so stock gameplay
is unchanged. Recorded traces in tests/fixtures pin this down.

Monster, Race and Class stay in pqcli.config so existing saves still
load.

Resolves #3

tests/test_parity.py

@@ -0,0 +1,14 @@
+from pathlib import Path
+
+import pytest
+from game_trace import run_trace
+
+FIXTURES = Path(__file__).parent / "fixtures"
+
+
+@pytest.mark.parametrize("seed", ["alpha", "beta", "gamma"])
+def test_gameplay_matches_recorded_trace(seed: str) -> None:
+    # The fixtures were recorded before the word lists moved to data files;
+    # stock data must reproduce them exactly, RNG stream included.
+    expected = (FIXTURES / f"parity_{seed}.txt").read_text().splitlines()
+    assert run_trace(seed) == expected