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>

Sources/AmiiboService/Public/Services/AmiiboService.swift

@@ -16,7 +16,7 @@ import Foundation
 
 /// The entry point for fetching data from the Amiibo API.
 ///
-/// This service forwards every call to the ``AmiiboClient`` passed at initialization, which defaults to ``AmiiboLiveClient``. It is `Sendable`, so you can share an instance across concurrency domains.
+/// It forwards every call to the ``AmiiboClient`` given at initialization, which defaults to ``AmiiboLiveClient``. Instances are `Sendable`.
 public struct AmiiboService: Sendable {
 
     // MARK: Properties
@@ -35,9 +35,9 @@ public struct AmiiboService: Sendable {
     // MARK: Functions
     
     /// Gets a list of amiibo items based on a given filter.
-    /// - Parameter filter: A filter to remove unwanted items from the result.
+    /// - Parameter filter: A filter for the result.
     /// - Returns: A list of filtered amiibo items.
-    /// - Throws: An ``AmiiboServiceError`` error in case some issue is encountered while generating the result.
+    /// - Throws: An ``AmiiboServiceError`` if the call fails.
     public func getAmiibos(
         _ filter: AmiiboFilter = .init()
     ) async throws(AmiiboServiceError) -> [Amiibo] {
@@ -45,9 +45,9 @@ public struct AmiiboService: Sendable {
     }
 
     /// Gets a list of amiibo series based on a given filter.
-    /// - Parameter filter: A filter to remove unwanted items from the result.
+    /// - Parameter filter: A filter for the result.
     /// - Returns: A list of filtered amiibo series.
-    /// - Throws: An ``AmiiboServiceError`` error in case some issue is encountered while generating the result.
+    /// - Throws: An ``AmiiboServiceError`` if the call fails.
     public func getAmiiboSeries(
         _ filter: AmiiboSeriesFilter = .init()
     ) async throws(AmiiboServiceError) -> [AmiiboSeries] {
@@ -55,9 +55,9 @@ public struct AmiiboService: Sendable {
     }
 
     /// Gets a list of amiibo types based on a given filter.
-    /// - Parameter filter: A filter to remove unwanted items from the result.
+    /// - Parameter filter: A filter for the result.
     /// - Returns: A list of filtered amiibo types.
-    /// - Throws: An ``AmiiboServiceError`` error in case some issue is encountered while generating the result.
+    /// - Throws: An ``AmiiboServiceError`` if the call fails.
     public func getAmiiboTypes(
         _ filter: AmiiboTypeFilter = .init()
     ) async throws(AmiiboServiceError) -> [AmiiboType] {
@@ -65,9 +65,9 @@ public struct AmiiboService: Sendable {
     }
 
     /// Gets a list of game characters based on a given filter.
-    /// - Parameter filter: A filter to remove unwanted items from the result.
+    /// - Parameter filter: A filter for the result.
     /// - Returns: A list of filtered game characters.
-    /// - Throws: An ``AmiiboServiceError`` error in case some issue is encountered while generating the result.
+    /// - Throws: An ``AmiiboServiceError`` if the call fails.
     public func getGameCharacters(
         _ filter: GameCharacterFilter = .init()
     ) async throws(AmiiboServiceError) -> [GameCharacter] {
@@ -75,9 +75,9 @@ public struct AmiiboService: Sendable {
     }
 
     /// Gets a list of game series based on a given filter.
-    /// - Parameter filter: A filter to remove unwanted items from the result.
+    /// - Parameter filter: A filter for the result.
     /// - Returns: A list of filtered game series.
-    /// - Throws: An ``AmiiboServiceError`` error in case some issue is encountered while generating the result.
+    /// - Throws: An ``AmiiboServiceError`` if the call fails.
     public func getGameSeries(
         _ filter: GameSeriesFilter = .init()
     ) async throws(AmiiboServiceError) -> [GameSeries] {
@@ -86,7 +86,7 @@ public struct AmiiboService: Sendable {
 
     /// Gets the date when the data was last updated.
     /// - Returns: A last updated date, decoded as UTC.
-    /// - Throws: An ``AmiiboServiceError`` error in case some issue is encountered while generating the result.
+    /// - Throws: An ``AmiiboServiceError`` if the call fails.
     public func getLastUpdated() async throws(AmiiboServiceError) -> Date {
         try await client.getLastUpdated()
     }