ci: remove sccache, keep only Swatinem/rust-cache

Simplify caching strategy by removing sccache from all workflows.
Swatinem/rust-cache@v2 provides sufficient caching for dependencies.

Removed from ci.yml (test, benchmark, release jobs):
- sccache setup and configuration steps
- RUSTC_WRAPPER and SCCACHE_GHA_ENABLED env vars

Removed from release.yml (build job):
- sccache setup and configuration steps

Author: bug-ops

.github/workflows/ci.yml

@@ -104,16 +104,6 @@ jobs:
         with:
           toolchain: ${{ matrix.rust }}
 
-      # Setup sccache for faster compilation
-      - name: Setup sccache
-        uses: mozilla-actions/[email protected]
-
-      - name: Configure sccache
-        shell: bash
-        run: |
-          echo "RUSTC_WRAPPER=sccache" >> $GITHUB_ENV
-          echo "SCCACHE_GHA_ENABLED=true" >> $GITHUB_ENV
-
       - name: Cache Cargo
         uses: Swatinem/rust-cache@v2
         with:
@@ -134,9 +124,6 @@ jobs:
       - name: Run doctests
         run: cargo test --doc --all-features --workspace
 
-      - name: sccache stats
-        run: sccache --show-stats
-
   # Code coverage (Linux only for speed)
   coverage:
     name: Code Coverage
@@ -228,14 +215,6 @@ jobs:
       - name: Install Rust
         uses: dtolnay/rust-toolchain@stable
 
-      - name: Setup sccache
-        uses: mozilla-actions/[email protected]
-
-      - name: Configure sccache
-        run: |
-          echo "RUSTC_WRAPPER=sccache" >> $GITHUB_ENV
-          echo "SCCACHE_GHA_ENABLED=true" >> $GITHUB_ENV
-
       - name: Cache Cargo
         uses: Swatinem/rust-cache@v2
         with:
@@ -244,9 +223,6 @@ jobs:
       - name: Build benchmarks (no run)
         run: cargo bench --no-run --profile bench-fast --workspace
 
-      - name: sccache stats
-        run: sccache --show-stats
-
   # Release build check
   release:
     name: Release Build
@@ -261,14 +237,6 @@ jobs:
       - name: Install Rust
         uses: dtolnay/rust-toolchain@stable
 
-      - name: Setup sccache
-        uses: mozilla-actions/[email protected]
-
-      - name: Configure sccache
-        run: |
-          echo "RUSTC_WRAPPER=sccache" >> $GITHUB_ENV
-          echo "SCCACHE_GHA_ENABLED=true" >> $GITHUB_ENV
-
       - name: Cache Cargo
         uses: Swatinem/rust-cache@v2
         with:
@@ -285,9 +253,6 @@ jobs:
           echo "Target directory size:"
           du -sh target/release/
 
-      - name: sccache stats
-        run: sccache --show-stats
-
   # All checks passed
   ci-success:
     name: CI Success

.github/workflows/release.yml

@@ -60,15 +60,6 @@ jobs:
           sudo apt-get update
           sudo apt-get install -y gcc-aarch64-linux-gnu
 
-      - name: Setup sccache
-        uses: mozilla-actions/[email protected]
-
-      - name: Configure sccache
-        shell: bash
-        run: |
-          echo "RUSTC_WRAPPER=sccache" >> $GITHUB_ENV
-          echo "SCCACHE_GHA_ENABLED=true" >> $GITHUB_ENV
-
       - name: Cache Cargo
         uses: Swatinem/rust-cache@v2
         with: