ci: automate code formatting and linting with github actions

.github/workflows/lint.yml

@@ -0,0 +1,50 @@
+name: lint
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    paths:
+      - "Sources/**"
+      - ".github/workflows/ci.yml"
+      - "Tests/**"
+
+concurrency:
+  group: lint-${{ github.head_ref }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+jobs:
+  lint:
+    name: lint
+    runs-on: macos-15
+    steps:
+      - uses: actions/checkout@v6
+        with:
+          fetch-depth: 0
+      - uses: jdx/mise-action@v3
+      - name: Run
+        run: mise run lint
+
+  discover-typos:
+    name: discover-typos
+    runs-on: macos-15
+    env:
+      DEVELOPER_DIR: /Applications/Xcode_16.4.app/Contents/Developer
+    steps:
+      - uses: actions/checkout@v6
+
+      - name: Set up Python environment
+        run: |
+          python3 -m venv .venv
+          source .venv/bin/activate
+          pip install --upgrade pip
+          pip install codespell
+
+      - name: Discover typos
+        run: |
+          source .venv/bin/activate
+          codespell --ignore-words-list="hart,inout,msdos,sur" --skip="./.build/*,./.git/*"

.swiftformat

@@ -1,6 +1,6 @@
 # Stream rules
 
---swiftversion 5.3
+--swiftversion 5.10
 
 # Use 'swiftformat --options' to list all of the possible options