Audit and fix 52 test correctness issues across 22 files

Systematic audit of 1,191 tests found tests written to pass rather than
verify correctness. Key fixes:

Infrastructure:
- TestClock: fixed timezone from .current to America/New_York (deterministic)
- TestFixtures: added 1.3x road routing factor to match production
- ItineraryTestHelpers: real per-city coordinates instead of hardcoded (40,-80)

Planning tests:
- Added missing Scenario E factory dispatch tests
- Tightened 12 loose assertions (>= 1 → == 8.0, > 0 → range checks)
- Fixed 4 no-op tests that accepted both success and failure
- Fixed wrong repeat-city invariant (was checking same-day, not different-day)
- Fixed tautological assertion in missing-stadium edge case

Services/Domain/Export tests:
- Replaced 4 placeholder tests (#expect(true)) with real assertions
- Fixed tautological assertions in POISearchServiceTests
- Fixed Chicago coordinate in RegionMapSelectorTests (-89 → -87.6553)
- Added sort order verification to ItineraryRowFlatteningTests

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

SportsTimeTests/Planning/ScenarioPlannerFactoryTests.swift

@@ -149,6 +149,44 @@ struct ScenarioPlannerFactoryTests {
         #expect(planner is ScenarioBPlanner, "B should take priority over C")
     }
 
+    @Test("planner: teamFirst with 2+ teams returns ScenarioEPlanner")
+    func planner_teamFirst_returnsScenarioE() {
+        let prefs = TripPreferences(
+            planningMode: .teamFirst,
+            sports: [.mlb],
+            startDate: TestClock.now,
+            endDate: TestClock.now.addingTimeInterval(86400 * 7),
+            leisureLevel: .moderate,
+            lodgingType: .hotel,
+            numberOfDrivers: 1,
+            selectedTeamIds: ["team-1", "team-2"]
+        )
+
+        let request = makeRequest(preferences: prefs)
+        let planner = ScenarioPlannerFactory.planner(for: request)
+
+        #expect(planner is ScenarioEPlanner)
+    }
+
+    @Test("classify: teamFirst with 2+ teams returns scenarioE")
+    func classify_teamFirst_returnsScenarioE() {
+        let prefs = TripPreferences(
+            planningMode: .teamFirst,
+            sports: [.mlb],
+            startDate: TestClock.now,
+            endDate: TestClock.now.addingTimeInterval(86400 * 7),
+            leisureLevel: .moderate,
+            lodgingType: .hotel,
+            numberOfDrivers: 1,
+            selectedTeamIds: ["team-1", "team-2"]
+        )
+
+        let request = makeRequest(preferences: prefs)
+        let scenario = ScenarioPlannerFactory.classify(request)
+
+        #expect(scenario == .scenarioE)
+    }
+
     // MARK: - Specification Tests: classify()
 
     @Test("classify: followTeamId returns scenarioD")