Remove Swift Package CI workflow that can never pass

swift.yml runs 'swift build' / 'swift test', which require a Package.swift.
This repo is an Xcode app project with no Swift package, so the workflow
has failed with 'Could not find Package.swift' on every run since it was
added, marking every push and PR with a failing check. The Build Debug IPA
workflow already compiles the project via xcodebuild on the same triggers,
so build validation is unaffected.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_013DNqCsHShA4yNqgZ6ZZQy3

.github/workflows/swift.yml

@@ -1,22 +0,0 @@
-# This workflow will build a Swift project
-# For more information see: https://docs.github.com/en/actions/automating-builds-and-tests/building-and-testing-swift
-
-name: Swift
-
-on:
-  push:
-    branches: [ "main" ]
-  pull_request:
-    branches: [ "main" ]
-
-jobs:
-  build:
-
-    runs-on: macos-latest
-
-    steps:
-    - uses: actions/checkout@v4
-    - name: Build
-      run: swift build -v
-    - name: Run tests
-      run: swift test -v