Optimize CI: Split into separate workflows with native path filtering

.github/actions/setup-copilot/action.yml

@@ -1,5 +1,9 @@
 name: "Setup Copilot"
 description: "Setup Copilot based on the project's package.json file."
+outputs:
+  cli-path:
+    description: "Path to the Copilot CLI"
+    value: ${{ steps.cli-path.outputs.path }}
 runs:
   using: "composite"
   steps:

.github/workflows/dotnet-sdk-tests.yml

@@ -0,0 +1,73 @@
+name: ".NET SDK Tests"
+
+on:
+  pull_request:
+    paths:
+      - 'dotnet/**'
+      - 'test/**'
+      - 'nodejs/package.json'
+      - '.github/workflows/dotnet-sdk-tests.yml'
+      - '.github/actions/setup-copilot/**'
+  workflow_dispatch:
+  merge_group:
+
+permissions:
+  contents: read
+
+jobs:
+  test:
+    name: ".NET SDK Tests"
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+    runs-on: ${{ matrix.os }}
+    defaults:
+      run:
+        shell: bash
+        working-directory: ./dotnet
+    steps:
+      - uses: actions/checkout@v6.0.2
+      - uses: ./.github/actions/setup-copilot
+        id: setup-copilot
+      - uses: actions/setup-dotnet@v5
+        with:
+          dotnet-version: "8.0.x"
+      - uses: actions/setup-node@v6
+        with:
+          cache: "npm"
+          cache-dependency-path: "./nodejs/package-lock.json"
+
+      - name: Install Node.js dependencies (for CLI)
+        working-directory: ./nodejs
+        run: npm ci --ignore-scripts
+
+      - name: Restore .NET dependencies
+        run: dotnet restore
+
+      - name: Run dotnet format check
+        if: runner.os == 'Linux'
+        run: |
+          dotnet format --verify-no-changes
+          if [ $? -ne 0 ]; then
+            echo "❌ dotnet format produced changes. Please run 'dotnet format' in dotnet"
+            exit 1
+          fi
+          echo "✅ dotnet format produced no changes"
+
+      - name: Build SDK
+        run: dotnet build --no-restore
+
+      - name: Install test harness dependencies
+        working-directory: ./test/harness
+        run: npm ci --ignore-scripts
+
+      - name: Warm up PowerShell
+        if: runner.os == 'Windows'
+        run: pwsh.exe -Command "Write-Host 'PowerShell ready'"
+
+      - name: Run .NET SDK tests
+        env:
+          COPILOT_HMAC_KEY: ${{ secrets.COPILOT_DEVELOPER_CLI_INTEGRATION_HMAC_KEY }}
+          COPILOT_CLI_PATH: ${{ steps.setup-copilot.outputs.cli-path }}
+        run: dotnet test --no-build -v n

.github/workflows/go-sdk-tests.yml

@@ -0,0 +1,69 @@
+name: "Go SDK Tests"
+
+on:
+  pull_request:
+    paths:
+      - 'go/**'
+      - 'test/**'
+      - 'nodejs/package.json'
+      - '.github/workflows/go-sdk-tests.yml'
+      - '.github/actions/setup-copilot/**'
+  workflow_dispatch:
+  merge_group:
+
+permissions:
+  contents: read
+
+jobs:
+  test:
+    name: "Go SDK Tests"
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+    runs-on: ${{ matrix.os }}
+    defaults:
+      run:
+        shell: bash
+        working-directory: ./go
+    steps:
+      - uses: actions/checkout@v6.0.2
+      - uses: ./.github/actions/setup-copilot
+        id: setup-copilot
+      - uses: actions/setup-go@v6
+        with:
+          go-version: "1.23"
+
+      - name: Run go fmt
+        if: runner.os == 'Linux'
+        working-directory: ./go
+        run: |
+          go fmt ./...
+          if [ -n "$(git status --porcelain)" ]; then
+            echo "❌ go fmt produced changes. Please run 'go fmt ./...' in go"
+            git --no-pager diff
+            exit 1
+          fi
+          echo "✅ go fmt produced no changes"
+
+      - name: Install golangci-lint
+        if: runner.os == 'Linux'
+        uses: golangci/golangci-lint-action@v9
+        with:
+          working-directory: ./go
+          version: latest
+          args: --timeout=5m
+
+      - name: Install test harness dependencies
+        working-directory: ./test/harness
+        run: npm ci --ignore-scripts
+
+      - name: Warm up PowerShell
+        if: runner.os == 'Windows'
+        run: pwsh.exe -Command "Write-Host 'PowerShell ready'"
+
+      - name: Run Go SDK tests
+        env:
+          COPILOT_HMAC_KEY: ${{ secrets.COPILOT_DEVELOPER_CLI_INTEGRATION_HMAC_KEY }}
+          COPILOT_CLI_PATH: ${{ steps.setup-copilot.outputs.cli-path }}
+        run: /bin/bash test.sh

.github/workflows/nodejs-sdk-tests.yml

@@ -0,0 +1,65 @@
+name: "Node.js SDK Tests"
+
+env:
+  HUSKY: 0
+
+on:
+  pull_request:
+    paths:
+      - 'nodejs/**'
+      - 'test/**'
+      - '.github/workflows/nodejs-sdk-tests.yml'
+      - '.github/actions/setup-copilot/**'
+  workflow_dispatch:
+  merge_group:
+
+permissions:
+  contents: read
+
+jobs:
+  test:
+    name: "Node.js SDK Tests"
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+    runs-on: ${{ matrix.os }}
+    defaults:
+      run:
+        shell: bash
+        working-directory: ./nodejs
+    steps:
+      - uses: actions/checkout@v6.0.2
+      - uses: actions/setup-node@v6
+        with:
+          cache: "npm"
+          cache-dependency-path: "./nodejs/package-lock.json"
+          node-version: 22
+      - uses: ./.github/actions/setup-copilot
+        id: setup-copilot
+      - name: Install dependencies
+        run: npm ci --ignore-scripts
+
+      - name: Run prettier check
+        if: runner.os == 'Linux'
+        run: npm run format:check
+
+      - name: Run ESLint
+        run: npm run lint
+
+      - name: Typecheck SDK
+        run: npm run typecheck
+
+      - name: Install test harness dependencies
+        working-directory: ./test/harness
+        run: npm ci --ignore-scripts
+
+      - name: Warm up PowerShell
+        if: runner.os == 'Windows'
+        run: pwsh.exe -Command "Write-Host 'PowerShell ready'"
+
+      - name: Run Node.js SDK tests
+        env:
+          COPILOT_HMAC_KEY: ${{ secrets.COPILOT_DEVELOPER_CLI_INTEGRATION_HMAC_KEY }}
+          COPILOT_CLI_PATH: ${{ steps.setup-copilot.outputs.cli-path }}
+        run: npm test

.github/workflows/python-sdk-tests.yml

@@ -0,0 +1,69 @@
+name: "Python SDK Tests"
+
+env:
+  PYTHONUTF8: 1
+
+on:
+  pull_request:
+    paths:
+      - 'python/**'
+      - 'test/**'
+      - 'nodejs/package.json'
+      - '.github/workflows/python-sdk-tests.yml'
+      - '.github/actions/setup-copilot/**'
+  workflow_dispatch:
+  merge_group:
+
+permissions:
+  contents: read
+
+jobs:
+  test:
+    name: "Python SDK Tests"
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+    runs-on: ${{ matrix.os }}
+    defaults:
+      run:
+        shell: bash
+        working-directory: ./python
+    steps:
+      - uses: actions/checkout@v6.0.2
+      - uses: ./.github/actions/setup-copilot
+        id: setup-copilot
+      - uses: actions/setup-python@v6
+        with:
+          python-version: "3.12"
+
+      - name: Set up uv
+        uses: astral-sh/setup-uv@v7
+        with:
+          enable-cache: true
+
+      - name: Install Python dev dependencies
+        run: uv sync --locked --all-extras --dev
+
+      - name: Run ruff format check
+        run: uv run ruff format --check .
+
+      - name: Run ruff lint
+        run: uv run ruff check
+
+      - name: Run ty type checking
+        run: uv run ty check copilot
+
+      - name: Install test harness dependencies
+        working-directory: ./test/harness
+        run: npm ci --ignore-scripts
+
+      - name: Warm up PowerShell
+        if: runner.os == 'Windows'
+        run: pwsh.exe -Command "Write-Host 'PowerShell ready'"
+
+      - name: Run Python SDK tests
+        env:
+          COPILOT_HMAC_KEY: ${{ secrets.COPILOT_DEVELOPER_CLI_INTEGRATION_HMAC_KEY }}
+          COPILOT_CLI_PATH: ${{ steps.setup-copilot.outputs.cli-path }}
+        run: uv run pytest -v -s