Few fixes and improvements to the library, plus Github Actions setup (#31)

This PR contains the work done to fix a cancellation-mapping bug in `AmiiboLiveClient`, bring the client under offline test coverage, add the conformances SwiftUI and persistence need, and moves CI and documentation publishing to GitHub Actions. All public API changes are additive.

### Fix

- `AmiiboLiveClient` reported an early task cancellation as `.unknown("CancellationError()")`. The OpenAPI runtime wraps every error in `ClientError`, so the `CancellationError` check never matched; it now also checks the wrapped error and throws `.cancelled`.

### Tests

- `ThrowingTransport` and `StubTransport` test doubles let the live client run offline. New tests cover error mapping, HTTP status → error mapping, `oneOf` object-vs-list decoding, `"amiibo": null`, sorting, filter → query encoding, `Platform`/`Release` mapping, and the date transcoder.
- Models gained `package` memberwise initializers so tests can build real fixtures without `@testable`. These are not public API.
- The test target now depends on `OpenAPIRuntime` and `HTTPTypes` (both already in the dependency graph).

### API
- Models are `Codable` and `Identifiable` (`Amiibo.id` is its `identifier`; the key/name models use `key`).
- Filters are `Hashable`.

### Documentation
- Doc comments trimmed library-wide; one repeated `- Throws:` sentence appeared 24 times. `Library.md` and the README tightened to match.

### CI and docs publishing
- `ci.yml`: build and offline tests on PRs and pushes to `main`.
- `live-tests.yml`: weekly and on-demand run against the live API.
- `docs.yml`: builds DocC on PRs, deploys to GitHub Pages on `main`. Pinned to Xcode 26 because swift-docc-plugin 1.5.0 fails to launch its tools under Xcode 27.
- The generated `docs/` folder (327 files) is removed from the repository and ignored.

Reviewed-on: #31
Co-authored-by: Javier Cicchelli <javier@rock-n-code.com>

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

@@ -32,7 +32,21 @@ struct AmiiboServiceMockTests {
         // THEN
         #expect(amiibos.isEmpty)
     }
-    
+
+    @Test("returns amiibos when mock provides a list")
+    func getAmiibosList() async throws {
+        // GIVEN
+        let service = AmiiboService(client: AmiiboMockClient(amiibos: Fixtures.amiibos))
+
+        // WHEN
+        let amiibos = try await service.getAmiibos()
+
+        // THEN
+        #expect(amiibos == Fixtures.amiibos)
+        #expect(amiibos.first?.identifier == "0100000000040002")
+        #expect(amiibos.first?.imageURL != nil)
+    }
+
     @Test("throws notFound when mock provides no amiibos")
     func getAmiibosNotFound() async {
         // GIVEN
@@ -70,7 +84,19 @@ struct AmiiboServiceMockTests {
         // THEN
         #expect(amiiboSeries.isEmpty)
     }
-    
+
+    @Test("returns amiibo series when mock provides a list")
+    func getAmiiboSeriesList() async throws {
+        // GIVEN
+        let service = AmiiboService(client: AmiiboMockClient(amiiboSeries: Fixtures.amiiboSeries))
+
+        // WHEN
+        let amiiboSeries = try await service.getAmiiboSeries()
+
+        // THEN
+        #expect(amiiboSeries == Fixtures.amiiboSeries)
+    }
+
     @Test("throws notFound when mock provides no amiibo series")
     func getAmiiboSeriesNotFound() async {
         // GIVEN
@@ -108,7 +134,19 @@ struct AmiiboServiceMockTests {
         // THEN
         #expect(amiiboTypes.isEmpty)
     }
-    
+
+    @Test("returns amiibo types when mock provides a list")
+    func getAmiiboTypesList() async throws {
+        // GIVEN
+        let service = AmiiboService(client: AmiiboMockClient(amiiboTypes: Fixtures.amiiboTypes))
+
+        // WHEN
+        let amiiboTypes = try await service.getAmiiboTypes()
+
+        // THEN
+        #expect(amiiboTypes == Fixtures.amiiboTypes)
+    }
+
     @Test("throws notFound when mock provides no amiibo types")
     func getAmiiboTypesNotFound() async {
         // GIVEN
@@ -146,7 +184,19 @@ struct AmiiboServiceMockTests {
         // THEN
         #expect(gameCharacters.isEmpty)
     }
-    
+
+    @Test("returns game characters when mock provides a list")
+    func getGameCharactersList() async throws {
+        // GIVEN
+        let service = AmiiboService(client: AmiiboMockClient(gameCharacters: Fixtures.gameCharacters))
+
+        // WHEN
+        let gameCharacters = try await service.getGameCharacters()
+
+        // THEN
+        #expect(gameCharacters == Fixtures.gameCharacters)
+    }
+
     @Test("throws notFound when mock provides no game characters")
     func getGameCharactersNotFound() async {
         // GIVEN
@@ -184,7 +234,19 @@ struct AmiiboServiceMockTests {
         // THEN
         #expect(gameSeries.isEmpty)
     }
-    
+
+    @Test("returns game series when mock provides a list")
+    func getGameSeriesList() async throws {
+        // GIVEN
+        let service = AmiiboService(client: AmiiboMockClient(gameSeries: Fixtures.gameSeries))
+
+        // WHEN
+        let gameSeries = try await service.getGameSeries()
+
+        // THEN
+        #expect(gameSeries == Fixtures.gameSeries)
+    }
+
     @Test("throws notFound when mock provides no game series")
     func getGameSeriesNotFound() async {
         // GIVEN