fix(ci): avoid caching cargo binaries

Disable Swatinem rust-cache binary caching so restored caches cannot replace cargo/rustup shims on hosted runners.

.github/workflows/ci.yml

@@ -55,6 +55,8 @@ jobs:
           done
           sudo apt-get install -y libdbus-1-dev pkg-config
       - uses: Swatinem/rust-cache@v2
+        with:
+          cache-bin: false
       - name: Check formatting
         run: cargo fmt --all -- --check
       # Mirror the release-workflow `parity` gate exactly. Anything that
@@ -83,6 +85,8 @@ jobs:
           done
           sudo apt-get install -y libdbus-1-dev pkg-config
       - uses: Swatinem/rust-cache@v2
+        with:
+          cache-bin: false
       - name: Run tests
         run: cargo test --workspace --all-features --locked
       - name: Lockfile drift guard
@@ -113,6 +117,8 @@ jobs:
         with:
           node-version: 20
       - uses: Swatinem/rust-cache@v2
+        with:
+          cache-bin: false
       - name: Build wrapper binaries
         run: cargo build --release --locked -p deepseek-tui-cli -p deepseek-tui
       - name: Smoke wrapper install and delegated entrypoints
@@ -136,6 +142,8 @@ jobs:
           done
           sudo apt-get install -y libdbus-1-dev pkg-config
       - uses: Swatinem/rust-cache@v2
+        with:
+          cache-bin: false
       - name: Build docs
         run: cargo doc --workspace --no-deps
         env:

.github/workflows/nightly.yml

@@ -71,6 +71,8 @@ jobs:
         with:
           targets: ${{ matrix.target }}
       - uses: Swatinem/rust-cache@v2
+        with:
+          cache-bin: false
       - name: Install Linux system dependencies
         if: runner.os == 'Linux'
         run: |

.github/workflows/release.yml

@@ -36,6 +36,8 @@ jobs:
           done
           sudo apt-get install -y libdbus-1-dev pkg-config
       - uses: Swatinem/rust-cache@v2
+        with:
+          cache-bin: false
       - name: Format check
         run: cargo fmt --all -- --check
       - name: Compile check
@@ -149,6 +151,8 @@ jobs:
         with:
           targets: ${{ matrix.target }}
       - uses: Swatinem/rust-cache@v2
+        with:
+          cache-bin: false
       - name: Install Linux system dependencies
         if: runner.os == 'Linux'
         run: |