Civ 6: Add era requirements for boosts and update boost prereqs (#5296)

* Resolve #5136

* Resolves #5210

worlds/civ_6/test/TestBoostsanity.py

@@ -105,3 +105,78 @@ class TestBoostsanityExcluded(CivVITestBase):
             if "BOOST" in location.name:
                 found_locations += 1
         self.assertEqual(found_locations, 0)
+
+
+class TestBoostsanityEraRequired(CivVITestBase):
+    options = {
+        "boostsanity": "true",
+        "progression_style": "none",
+        "shuffle_goody_hut_rewards": "false",
+    }
+
+    def test_era_required_boosts_not_accessible_early(self) -> None:
+        # BOOST_CIVIC_FEUDALISM has EraRequired=True and ERA_CLASSICAL
+        # It should NOT be accessible in Ancient era
+        self.assertFalse(self.can_reach_location("BOOST_CIVIC_FEUDALISM"))
+
+        # BOOST_CIVIC_URBANIZATION has EraRequired=True and ERA_INDUSTRIAL
+        # It should NOT be accessible in Ancient era
+        self.assertFalse(self.can_reach_location("BOOST_CIVIC_URBANIZATION"))
+
+        # BOOST_CIVIC_SPACE_RACE has EraRequired=True and ERA_ATOMIC
+        # It should NOT be accessible in Ancient era
+        self.assertFalse(self.can_reach_location("BOOST_CIVIC_SPACE_RACE"))
+
+        # Regular boosts without EraRequired should be accessible
+        self.assertTrue(self.can_reach_location("BOOST_TECH_SAILING"))
+        self.assertTrue(self.can_reach_location("BOOST_CIVIC_MILITARY_TRADITION"))
+
+    def test_era_required_boosts_accessible_in_correct_era(self) -> None:
+        # Collect items to reach Classical era
+        self.collect_by_name(["Mining", "Bronze Working", "Astrology", "Writing",
+                              "Irrigation", "Sailing", "Animal Husbandry",
+                              "State Workforce", "Foreign Trade"])
+
+        # BOOST_CIVIC_FEUDALISM should now be accessible in Classical era
+        self.assertTrue(self.can_reach_location("BOOST_CIVIC_FEUDALISM"))
+
+        # BOOST_CIVIC_URBANIZATION still not accessible (requires Industrial)
+        self.assertFalse(self.can_reach_location("BOOST_CIVIC_URBANIZATION"))
+
+        # Collect more items to reach Industrial era
+        self.collect_all_but(["TECH_ROCKETRY"])
+
+        # Now BOOST_CIVIC_URBANIZATION should be accessible
+        self.assertTrue(self.can_reach_location("BOOST_CIVIC_URBANIZATION"))
+
+
+class TestBoostsanityEraRequiredWithProgression(CivVITestBase):
+    options = {
+        "boostsanity": "true",
+        "progression_style": "eras_and_districts",
+        "shuffle_goody_hut_rewards": "false",
+    }
+
+    def test_era_required_with_progressive_eras(self) -> None:
+        # Collect all items except Progressive Era
+        self.collect_all_but(["Progressive Era"])
+
+        # Even with all other items, era-required boosts should not be accessible
+        self.assertFalse(self.can_reach_location("BOOST_CIVIC_FEUDALISM"))
+        self.assertFalse(self.can_reach_location("BOOST_CIVIC_URBANIZATION"))
+
+        # Collect enough Progressive Era items to reach Classical (needs 2)
+        self.collect(self.get_item_by_name("Progressive Era"))
+        self.collect(self.get_item_by_name("Progressive Era"))
+
+        # BOOST_CIVIC_FEUDALISM should now be accessible
+        self.assertTrue(self.can_reach_location("BOOST_CIVIC_FEUDALISM"))
+
+        # But BOOST_CIVIC_URBANIZATION still requires Industrial era (needs 5 total)
+        self.assertFalse(self.can_reach_location("BOOST_CIVIC_URBANIZATION"))
+
+        # Collect 3 more Progressive Era items to reach Industrial
+        self.collect_by_name(["Progressive Era", "Progressive Era", "Progressive Era"])
+
+        # Now BOOST_CIVIC_URBANIZATION should be accessible
+        self.assertTrue(self.can_reach_location("BOOST_CIVIC_URBANIZATION"))