feat(events): read EventGating and run the Crux Prime pirateDay loads

EventGating (eventName, date_start, date_end; 8 rows) is only in the
CDClient for the server: the 1.10.64 client has no string for it. The
dates are Unix times (UTC), inclusive: pirateDay 2011-09-19 00:00 to
2011-09-20 23:59:59 (Talk Like a Pirate Day), buildNexusTower 2010-03-09
to 2011-03-14, buildNexusTowerEnd, frostburgh2010_notused and test rows.
The live Lua asked for an event with GetHolidayEvent{eventToCheck =
name}.isValid; the only callers are the Crux Prime random spawners
(L_BASE_RANDOM_SPAWNER.lua, L_AM_ZONE_SERVER.lua), whose only event is
pirateDay. DLU's BaseRandomServer::CheckEvents was a TODO.

- CDEventGatingTable loads the table; HolidayEvents::IsActive(name) is
  true while the dates include now, or when event_1..event_8 names the
  event (every live date is in 2010/2011, so this is how a server turns
  one on; the same settings already switch gatingOnFeature objects).
- BaseRandomServer::CheckEvents: during pirateDay the str and zip areas
  use the event loads from the Lua (80%: 5 pirates on each of type1-3,
  20%: 5 admirals each; multipliers secA 1, secB 1, secC 1.2 for str).
  Inferred: every spawner's Lua put the whole {str, zip} table in its
  zones, which its getRandomLoad walks with ipairs and so finds no load;
  DLU uses each table for the area it names, as L_AM_ZONE_SERVER.lua's
  layout intends.
- sharedconfig.ini says event_N also takes EventGating names.

Check in game: with event_2=pirateDay in sharedconfig.ini, the Crux Prime
areas filled by the str and zip random spawners (spawner networks
em_str_* and em_zip_*) spawn only Maelstrom pirates and admirals; the
other two areas and a server without the setting spawn the usual mix.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/dGameTests/HolidayEventsTests.cpp

@@ -0,0 +1,49 @@
+// EventGating (a server-only table) as GetHolidayEvent answered it: an event runs while its dates include the time;
+// a server can also name it in event_1..event_8.
+#include "GameDependencies.h"
+
+#include "CDClientManager.h"
+#include "CDEventGatingTable.h"
+#include "HolidayEvents.h"
+
+#include <array>
+#include <string_view>
+
+#include <gtest/gtest.h>
+
+class HolidayEventsTests : public GameDependenciesTest {
+protected:
+	void SetUp() override {
+		SetUpDependencies();
+		// Rows as in the 1.10.64 CDClient
+		auto& rows = CDClientManager::GetEntriesMutable<CDEventGatingTable>();
+		rows.push_back({ "pirateDay", 1316390400, 1316563199 });
+		rows.push_back({ "buildNexusTower", 1268092800, 1299801600 });
+	}
+
+	void TearDown() override {
+		CDClientManager::GetEntriesMutable<CDEventGatingTable>().clear();
+		TearDownDependencies();
+	}
+};
+
+TEST_F(HolidayEventsTests, DatesIncludeBothEnds) {
+	const auto* const table = CDClientManager::GetTable<CDEventGatingTable>();
+	EXPECT_FALSE(table->IsEventActive("pirateDay", 1316390399));
+	EXPECT_TRUE(table->IsEventActive("pirateDay", 1316390400)); // 2011-09-19 00:00 UTC
+	EXPECT_TRUE(table->IsEventActive("pirateDay", 1316563199)); // 2011-09-20 23:59:59 UTC
+	EXPECT_FALSE(table->IsEventActive("pirateDay", 1316563200));
+	EXPECT_FALSE(table->IsEventActive("noSuchEvent", 1316390400));
+}
+
+TEST_F(HolidayEventsTests, ServerSettingTurnsAnEventOn) {
+	constexpr int64_t now = 1790000000; // 2026: no live dates match
+	const std::array<std::string_view, 8> none{};
+	EXPECT_FALSE(HolidayEvents::IsActive("pirateDay", now, none.data(), none.size()));
+
+	const std::array<std::string_view, 8> pirates{ "Talk_Like_A_Pirate", "pirateDay" };
+	EXPECT_TRUE(HolidayEvents::IsActive("pirateDay", now, pirates.data(), pirates.size()));
+	EXPECT_FALSE(HolidayEvents::IsActive("buildNexusTower", now, pirates.data(), pirates.size()));
+	EXPECT_FALSE(HolidayEvents::IsActive("", now, none.data(), none.size())); // empty event_N settings don't match
+	EXPECT_TRUE(HolidayEvents::IsActive("buildNexusTower", 1268092800, none.data(), none.size()));
+}