Go-based Feed Fetcher Implementation

.github/workflows/feedfetcher-tests.yml

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+name: FeedFetcher Tests
+
+on:
+  pull_request:
+    paths:
+      - 'feedfetcher/**'
+      - '.github/workflows/feedfetcher-tests.yml'
+  push:
+    branches:
+      - main
+    paths:
+      - 'feedfetcher/**'
+
+jobs:
+  test:
+    name: Test
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v4
+
+    - name: Set up Go
+      uses: actions/setup-go@v4
+      with:
+        go-version: '1.21'
+
+    - name: Download dependencies
+      working-directory: ./feedfetcher
+      run: go mod download
+
+    - name: Run tests
+      working-directory: ./feedfetcher
+      run: go test -v -race -coverprofile=coverage.txt -covermode=atomic ./...
+
+    - name: Upload coverage
+      uses: codecov/codecov-action@v3
+      with:
+        file: ./feedfetcher/coverage.txt
+        flags: feedfetcher
+
+  build:
+    name: Build
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v4
+
+    - name: Set up Go
+      uses: actions/setup-go@v4
+      with:
+        go-version: '1.21'
+
+    - name: Build binary
+      working-directory: ./feedfetcher
+      run: make build
+
+    - name: Verify binary
+      working-directory: ./feedfetcher
+      run: |
+        ./feedfetcher --help || true
+        file feedfetcher
+
+  lint:
+    name: Lint
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v4
+
+    - name: Set up Go
+      uses: actions/setup-go@v4
+      with:
+        go-version: '1.21'
+
+    - name: golangci-lint
+      uses: golangci/golangci-lint-action@v3
+      with:
+        version: latest
+        working-directory: ./feedfetcher

.gitignore

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+# PR descriptions (for local reference only)
+PR_DESCRIPTION.md
+
+# OS
+.DS_Store