feat: Metal/CUDA GPU 전사와 Rust 오디오 백엔드 도입

.coveragerc

@@ -1,5 +1,6 @@
 [run]
 source =
+    audio_library
     chapters
     diarize
     job_store

.github/workflows/ci.yml

@@ -19,6 +19,8 @@ jobs:
         python-version: ["3.10", "3.11", "3.12"]
     steps:
       - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+        with:
+          persist-credentials: false
 
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@ece7cb06caefa5fff74198d8649806c4678c61a1 # v6.3.0
@@ -41,3 +43,28 @@ jobs:
 
       - name: Verify console entry point
         run: codec-carver --help
+
+  rust:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, macos-latest]
+    steps:
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+        with:
+          persist-credentials: false
+
+      - name: Install Rust 1.88.0 with rustfmt
+        run: rustup toolchain install 1.88.0 --profile minimal --component rustfmt
+
+      - name: Report Rust toolchain
+        run: |
+          rustup run 1.88.0 rustc --version --verbose
+          rustup run 1.88.0 cargo --version --verbose
+
+      - name: Check Rust formatting
+        run: rustup run 1.88.0 cargo fmt --manifest-path rust-core/Cargo.toml -- --check
+
+      - name: Test Rust backend
+        run: rustup run 1.88.0 cargo test --locked --all-targets --manifest-path rust-core/Cargo.toml

.gitignore

@@ -23,3 +23,6 @@ leak-*
 
 # Generated conversion outputs / reports
 under_2gb/
+
+# Rust build outputs
+rust-core/target/