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/Models/Amiibo.swift

@@ -15,7 +15,7 @@
 import Foundation
 
 /// A model that represents an amiibo.
-public struct Amiibo: Sendable, Hashable {
+public struct Amiibo: Sendable, Hashable, Codable, Identifiable {
     
     // MARK: Properties
     
@@ -36,7 +36,7 @@ public struct Amiibo: Sendable, Hashable {
 
     /// The related games of this amiibo, grouped by platform.
     ///
-    /// This value is `nil` unless the request sets ``AmiiboFilter/showGames`` or ``AmiiboFilter/showUsage``, or when the amiibo has no related games.
+    /// `nil` unless the request sets ``AmiiboFilter/showGames`` or ``AmiiboFilter/showUsage``, or when there are no related games.
     public let platform: Platform?
     
     /// The release dates of this amiibo across different regions.
@@ -52,7 +52,32 @@ public struct Amiibo: Sendable, Hashable {
     public let type: String
     
     // MARK: Initializers
-    
+
+    /// Initializes this model.
+    package init(
+        head: String,
+        tail: String,
+        name: String,
+        type: String,
+        series: String,
+        gameCharacter: String,
+        gameSeries: String,
+        image: String,
+        release: Release = .init(),
+        platform: Platform? = nil
+    ) {
+        self.gameCharacter = gameCharacter
+        self.gameSeries = gameSeries
+        self.head = head
+        self.image = image
+        self.name = name
+        self.platform = platform
+        self.release = release
+        self.series = series
+        self.tail = tail
+        self.type = type
+    }
+
     /// Initializes this model from a given payload.
     /// - Parameter payload: A payload that contains the values for the model.
     init(_ payload: Components.Schemas.Amiibo) {
@@ -74,7 +99,12 @@ public struct Amiibo: Sendable, Hashable {
     }
     
     // MARK: Computed
-    
+
+    /// The ``identifier`` of this amiibo.
+    public var id: String {
+        identifier
+    }
+
     /// The full 16-character hexadecimal identifier, composed of the ``head`` and ``tail``.
     public var identifier: String {
         head + tail