Small joys: Quote of the Day + Word of the Day engines

- quote.py: curated public-domain quote pool (16 seeded, admin-grows), deterministic daily
  pick, lazy AI "what it means" explainer of the real quote (cached). No LLM-invented quotes.
- wotd.py: LLM proposes positive words → validated/enriched against dictionaryapi.dev (real
  definition, IPA, examples, audio) → audio clip cached to our origin (TTS fallback) →
  deterministic daily pick. Tops the pool up toward 30/day.
- db.py: quote_pool/daily_quote + wotd_pool/daily_wotd tables.
- api.py: /api/quote/today, /api/word/today, /api/word/audio/{word} (GET+HEAD).
- cli.py: cycle steps for both (under --no-joys), shared LLM client.
- tests: test_quote.py (6) + test_wotd.py (5). 393 backend tests green.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

tests/test_wotd.py

@@ -0,0 +1,66 @@
+"""Word of the Day: LLM-proposed words validated against the dictionary (mocked),
+harvest dedupes + drops unknowns, audio cached when present, deterministic pick."""
+import json
+
+import pytest
+
+from goodnews import wotd
+from goodnews.db import connect, init_db
+
+FAKE_DICT = {
+    "serene": {"word": "serene", "part_of_speech": "adjective", "phonetic": "/səˈriːn/",
+               "audio_url": "https://a/serene.mp3", "definition": "calm, peaceful, and untroubled",
+               "examples": ["a serene mountain lake"]},
+    "dawn": {"word": "dawn", "part_of_speech": "noun", "phonetic": "/dɔːn/",
+             "audio_url": None, "definition": "the first appearance of light in the sky", "examples": []},
+}
+
+
+class FakeClient:
+    def chat_text(self, messages):
+        return '{"words": ["serene", "dawn", "xyzzyq"]}'   # xyzzyq isn't a real word
+
+
+@pytest.fixture
+def conn(tmp_path, monkeypatch):
+    monkeypatch.setenv("GOODNEWS_WOTD_AUDIO", str(tmp_path / "audio"))
+    monkeypatch.setattr(wotd, "_lookup", lambda w: FAKE_DICT.get(w))               # no dictionary network
+    monkeypatch.setattr(wotd, "_cache_audio", lambda url, word: f"{word}.mp3" if url else None)
+    c = connect(":memory:"); init_db(c)
+    yield c
+    c.close()
+
+
+def test_harvest_validates_dedupes_and_caches_audio(conn):
+    r = wotd.harvest(conn, FakeClient())
+    assert r["added"] == 2                                  # serene + dawn; the nonsense word dropped
+    assert wotd.harvest(conn, FakeClient())["added"] == 0   # idempotent (word is UNIQUE)
+    assert conn.execute("SELECT audio_file FROM wotd_pool WHERE word='serene'").fetchone()[0] == "serene.mp3"
+    assert conn.execute("SELECT audio_file FROM wotd_pool WHERE word='dawn'").fetchone()[0] is None
+
+
+def test_pick_caches_marks_shown_idempotent(conn):
+    wotd.harvest(conn, FakeClient())
+    a = wotd.pick_daily(conn, feature_date="2026-06-22")
+    assert a and a["word"] in ("serene", "dawn") and a["definition"]
+    assert json.loads(a["examples"]) == FAKE_DICT[a["word"]]["examples"]
+    shown = conn.execute("SELECT shown_at FROM wotd_pool WHERE id=?", (a["pool_id"],)).fetchone()[0]
+    assert shown == "2026-06-22"
+    assert wotd.pick_daily(conn, feature_date="2026-06-22")["pool_id"] == a["pool_id"]
+
+
+def test_featured_pinned(conn):
+    wotd.harvest(conn, FakeClient())
+    conn.execute("UPDATE wotd_pool SET featured=1 WHERE word='dawn'"); conn.commit()
+    assert wotd.pick_daily(conn, feature_date="2026-06-22", force=True)["word"] == "dawn"
+
+
+def test_get_today_never_empty(conn):
+    wotd.harvest(conn, FakeClient())
+    a = wotd.pick_daily(conn, feature_date="2026-06-22")
+    assert wotd.get_today(conn, "2099-01-01")["pool_id"] == a["pool_id"]
+
+
+def test_run_daily_bootstraps(conn):
+    r = wotd.run_daily(conn, client=FakeClient())
+    assert r["pool"] == 2 and r["picked"] in ("serene", "dawn")