test(mcp): combler les lacunes de couverture relevées par la revue finale

Ajoute des tests de bout en bout pour les filtres montant/date/cpv, le
chemin titulaire de search_organisations, et la pagination (page>1,
clamping page=0). Normalise montant_total en float dans les deux
branches de compute_org_stats.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

tests/mcp/test_queries.py

@@ -39,6 +39,19 @@ def test_search_organisations_finds_known_acheteur():
     assert "<" not in first["nom"]  # Défense : aucun markup HTML ne s'échappe
 
 
+def test_search_organisations_finds_known_titulaire():
+    result = search_organisations("TITULAIRE", "titulaire")
+    assert any(r["id"] == "345" for r in result)
+    first = next(r for r in result if r["id"] == "345")
+    assert set(first.keys()) == {"id", "nom", "departement"}
+    # Vérifier que le nom a été extrait en texte plain (HTML strippé),
+    # même chemin SIRET/non-SIRET différent de celui du test acheteur.
+    assert first["id"] == "345"
+    assert first["nom"] == "TITULAIRE 1"
+    assert "<" not in first["id"]
+    assert "<" not in first["nom"]
+
+
 def test_search_organisations_invalid_type_raises():
     with pytest.raises(ValueError):
         search_organisations("x", "autre")
@@ -87,6 +100,34 @@ def test_search_marches_bad_filter_returns_error():
     assert "error" in result
 
 
+def test_search_marches_montant_min_filters_correctly():
+    assert search_marches(montant_min=100)["meta"]["total"] == 0
+    assert search_marches(montant_min=1)["meta"]["total"] >= 1
+
+
+def test_search_marches_date_min_max_filters_correctly():
+    assert search_marches(date_min="2025-01-01")["meta"]["total"] >= 1
+    assert search_marches(date_min="2025-01-02")["meta"]["total"] == 0
+    assert search_marches(date_max="2025-01-01")["meta"]["total"] >= 1
+    assert search_marches(date_max="2024-12-31")["meta"]["total"] == 0
+
+
+def test_search_marches_cpv_filters_correctly():
+    assert search_marches(cpv="716")["meta"]["total"] >= 1
+    assert search_marches(cpv="999")["meta"]["total"] == 0
+
+
+def test_search_marches_page_2_is_empty_with_correct_meta():
+    result = search_marches(acheteur_id="123", page=2)
+    assert result["meta"]["page"] == 2
+    assert result["marches"] == []
+
+
+def test_search_marches_page_zero_is_clamped_to_one():
+    result = search_marches(acheteur_id="123", page=0)
+    assert result["meta"]["page"] == 1
+
+
 def test_compute_org_stats_acheteur_known():
     stats = compute_org_stats("acheteur", "123")
     assert stats["nb_marches"] >= 1