ci: add GitHub Actions workflow for automated testing

Add comprehensive CI pipeline that runs on push and pull requests:

- **Test Job**: Runs tests, checks formatting, and linting
  - cargo fmt check for code style consistency
  - cargo clippy with warnings as errors for code quality
  - cargo test for test suite execution
  - Caching for faster builds (registry, git, build artifacts)

- **Security Job**: Runs cargo-audit for dependency vulnerabilities

- **Coverage Job**: Generates code coverage reports with tarpaulin
  - Uploads to Codecov for tracking coverage over time

Triggers on:
- Push to main, develop, feature/*, release/*, hotfix/* branches
- Pull requests to main and develop branches

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

.github/workflows/ci.yml

@@ -0,0 +1,108 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - main
+      - develop
+      - 'feature/**'
+      - 'release/**'
+      - 'hotfix/**'
+  pull_request:
+    branches:
+      - main
+      - develop
+
+env:
+  CARGO_TERM_COLOR: always
+  RUST_BACKTRACE: 1
+
+jobs:
+  test:
+    name: Test
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Install Rust toolchain
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          components: rustfmt, clippy
+
+      - name: Cache cargo registry
+        uses: actions/cache@v4
+        with:
+          path: ~/.cargo/registry
+          key: ${{ runner.os }}-cargo-registry-${{ hashFiles('**/Cargo.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-cargo-registry-
+
+      - name: Cache cargo index
+        uses: actions/cache@v4
+        with:
+          path: ~/.cargo/git
+          key: ${{ runner.os }}-cargo-git-${{ hashFiles('**/Cargo.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-cargo-git-
+
+      - name: Cache cargo build
+        uses: actions/cache@v4
+        with:
+          path: target
+          key: ${{ runner.os }}-cargo-build-target-${{ hashFiles('**/Cargo.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-cargo-build-target-
+
+      - name: Check formatting
+        run: cargo fmt --all -- --check
+
+      - name: Run clippy
+        run: cargo clippy --all-targets --all-features -- -D warnings
+
+      - name: Build
+        run: cargo build --verbose
+
+      - name: Run tests
+        run: cargo test --verbose
+
+  security:
+    name: Security Audit
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Install Rust toolchain
+        uses: dtolnay/rust-toolchain@stable
+
+      - name: Install cargo-audit
+        run: cargo install cargo-audit
+
+      - name: Run security audit
+        run: cargo audit
+
+  coverage:
+    name: Code Coverage
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Install Rust toolchain
+        uses: dtolnay/rust-toolchain@stable
+
+      - name: Install tarpaulin
+        run: cargo install cargo-tarpaulin
+
+      - name: Generate coverage
+        run: cargo tarpaulin --verbose --all-features --workspace --timeout 120 --out xml
+
+      - name: Upload coverage to Codecov
+        uses: codecov/codecov-action@v4
+        with:
+          fail_ci_if_error: false
+          files: ./cobertura.xml