Some fixes to the live test suite (#32)

This PR contains the work done to fix the live test suite, which started failing once the Amiibo API began returning Switch 2 games, and tidies the test suite around it.

### Changes

- **Live tests:** replaced the assertion that the first amiibo has no Switch 2 games with a usage check, matching the other platforms. The live data now includes Switch 2 entries for most amiibos.
- **Live tests:** refreshed the minimum item counts and the earliest accepted last-updated date to the values observed in October 2026, and documented in the README how to refresh them.
- **All tests:** moved test descriptions from `@Test("...")` strings into backticked function names, and aligned every case on the same GIVEN/WHEN/THEN structure.
- **Live client:** replaced the TODO about DocC inherited docs with a note. The compiler does not inherit documentation for protocol witnesses, so the repeated doc comments stay on purpose.

Reviewed-on: #32
Co-authored-by: Javier Cicchelli <javier@rock-n-code.com>

Tests/AmiiboService/Cases/Public/Services/AmiiboServiceLiveTests.swift

@@ -181,8 +181,8 @@ struct AmiiboServiceLiveTests {
     @Test
     func `get the last updated timestamp`() async throws {
         try await assertLastUpdated(
-            onOrAfterDay: 24,
-            month: 7,
+            onOrAfterDay: 22,
+            month: 10,
             year: 2026
         )
     }
@@ -221,8 +221,7 @@ private extension AmiiboServiceLiveTests {
 
         if filter.showUsage == true {
             #expect(firstAmiiboPlatform.switch.first?.usages?.isEmpty == false)
-            // Given the live data is still not returning any Switch 2 games.
-            #expect(firstAmiiboPlatform.switch2.isEmpty == true)
+            #expect(firstAmiiboPlatform.switch2.first?.usages?.isEmpty == false)
             #expect(firstAmiiboPlatform.threeDS.first?.usages?.isEmpty == false)
             #expect(firstAmiiboPlatform.wiiU.first?.usages?.isEmpty == false)
         }
@@ -584,16 +583,16 @@ enum Output {
 // MARK: - Constants
 
 private extension Int {
-    /// A number that represents the minimum number of amiibo items expected from the live service, as of July 2026.
-    static let minimumAmiibos = 946
-    /// A number that represents the minimum number of amiibo series expected from the live service, as of July 2026.
-    static let minimumAmiiboSeries = 31
-    /// A number that represents the minimum number of amiibo types expected from the live service, as of July 2026.
+    /// A number that represents the minimum number of amiibo items expected from the live service, as of October 2026.
+    static let minimumAmiibos = 952
+    /// A number that represents the minimum number of amiibo series expected from the live service, as of October 2026.
+    static let minimumAmiiboSeries = 32
+    /// A number that represents the minimum number of amiibo types expected from the live service, as of October 2026.
     static let minimumAmiiboTypes = 5
-    /// A number that represents the minimum number of game characters expected from the live service, as of July 2026.
-    static let minimumGameCharacters = 681
-    /// A number that represents the minimum number of game series expected from the live service, as of July 2026.
-    static let minimumGameSeries = 118
+    /// A number that represents the minimum number of game characters expected from the live service, as of October 2026.
+    static let minimumGameCharacters = 685
+    /// A number that represents the minimum number of game series expected from the live service, as of October 2026.
+    static let minimumGameSeries = 119
 }
 
 private extension String {