[codex] split fast PR and release workflows

.github/CICD_GUIDE.md

@@ -15,7 +15,7 @@ The Janus project uses GitHub Actions for continuous integration and deployment.
 ### Manual Trigger
 
 ```bash
-# Via GitHub UI: Actions tab → CI/CD Pipeline → Run workflow
+# Via GitHub UI: Actions tab → choose `Fast PR Checks` or `Release And Extended CI` → Run workflow
 ```
 
 ## Jobs Overview
@@ -313,7 +313,8 @@ Common issues:
 
 ### Main Configuration
 
-- `.github/workflows/ci.yml` - Main pipeline
+- `.github/workflows/fast-pr.yml` - Fast pull request validation
+- `.github/workflows/release.yml` - Extended branch, release, and scheduled checks
 
 ### Supporting Files
 
@@ -355,4 +356,4 @@ Common issues:
 - Simplified from 9 jobs to 5-6 jobs
 - Reduced pipeline time by ~70%
 - Added dependency review for PRs
-- Updated publish job to remove Rust dependencies
+- Updated publish job to remove Rust dependencies

.github/copilot-instructions.md

@@ -57,7 +57,7 @@ make fmt            # Format all code
 make clippy         # Lint checks
 ```
 
-**CI Pipeline:** GitHub Actions runs `rustfmt`, `clippy`, and tests on Ubuntu/Windows/macOS with stable/beta Rust. See `.github/workflows/ci.yml`.
+**CI Pipeline:** GitHub Actions runs fast PR checks from `.github/workflows/fast-pr.yml` and extended push/release checks from `.github/workflows/release.yml`.
 
 ### Benchmarking
 

.github/workflows/fast-pr.yml

@@ -0,0 +1,68 @@
+name: Fast PR Checks
+
+on:
+  pull_request:
+    branches: [main, develop]
+    paths-ignore:
+      - "**/*.md"
+      - "docs/**"
+
+concurrency:
+  group: fast-pr-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  fmt:
+    name: Rustfmt
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Install Rust toolchain
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          components: rustfmt
+
+      - name: Check formatting
+        run: cargo fmt --all -- --check
+
+  clippy:
+    name: Clippy
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Install Rust toolchain
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          components: clippy
+
+      - name: Cache Rust build artifacts
+        uses: Swatinem/rust-cache@v2
+
+      - name: Run Clippy
+        run: cargo clippy --all-targets --all-features -- -D warnings
+
+  test:
+    name: Test Suite
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Install Rust toolchain
+        uses: dtolnay/rust-toolchain@stable
+
+      - name: Cache Rust build artifacts
+        uses: Swatinem/rust-cache@v2
+
+      - name: Run tests
+        run: cargo test --all-features --verbose
+
+      - name: Run doc tests
+        run: cargo test --doc --all-features --verbose