Fix Windows Rust CI cache: full target, Cargo registry, explicit save.

Cache the entire windows-setup target tree plus ~/.cargo; split restore/save; skip cargo build when all release binaries are present.

Co-authored-by: Cursor <cursoragent@cursor.com>

.github/actions/cache-windows-rust-tools/action.yml

@@ -1,18 +1,21 @@
-name: Cache Windows installer Rust binaries
+name: Restore Windows Rust build cache
-description: Restore or save compiled windows-setup release executables
+description: Restore Cargo registry, git checkouts, and the windows-setup target directory
 
 outputs:
   cache-hit:
-    description: Whether Rust installer tools were restored from cache
+    description: Whether an exact cache key match was restored
     value: ${{ steps.cache.outputs.cache-hit }}
 
 runs:
   using: composite
   steps:
-    - uses: actions/cache@v5
+    - uses: actions/cache/restore@v5
       id: cache
       with:
-        path: app/desktop/windows-setup/target/release
+        path: |
-        key: windows-rust-tools-v1-${{ hashFiles('app/desktop/windows-setup/Cargo.lock') }}
+          ~/.cargo/registry
+          ~/.cargo/git
+          app/desktop/windows-setup/target
+        key: windows-rust-${{ runner.os }}-v2-${{ hashFiles('app/desktop/windows-setup/Cargo.lock', 'app/desktop/windows-setup/Cargo.toml', 'app/desktop/windows-setup/**/src/**', 'app/desktop/windows-setup/**/build.rs') }}
         restore-keys: |
-          windows-rust-tools-v1-
+          windows-rust-${{ runner.os }}-v2-

.github/actions/save-windows-rust-cache/action.yml

@@ -0,0 +1,14 @@
+name: Save Windows Rust build cache
+description: Save Cargo registry, git checkouts, and the windows-setup target directory
+
+runs:
+  using: composite
+  steps:
+    - uses: actions/cache/save@v5
+      continue-on-error: true
+      with:
+        key: windows-rust-${{ runner.os }}-v2-${{ hashFiles('app/desktop/windows-setup/Cargo.lock', 'app/desktop/windows-setup/Cargo.toml', 'app/desktop/windows-setup/**/src/**', 'app/desktop/windows-setup/**/build.rs') }}
+        path: |
+          ~/.cargo/registry
+          ~/.cargo/git
+          app/desktop/windows-setup/target

.github/workflows/release.yml

@@ -146,21 +146,32 @@ jobs:
       - uses: dtolnay/rust-toolchain@stable
         with:
           targets: x86_64-pc-windows-msvc
-      - name: Cache Cargo registry
-        uses: actions/cache@v5
-        with:
-          path: |
-            ~/.cargo/registry
-            ~/.cargo/git
-          key: cargo-registry-${{ runner.os }}-${{ hashFiles('app/desktop/windows-setup/Cargo.lock') }}
-          restore-keys: |
-            cargo-registry-${{ runner.os }}-
       - uses: ./.github/actions/cache-windows-rust-tools
         id: rust-tools-cache
+      - name: Verify Windows Rust binaries
+        id: rust-binaries
+        shell: bash
+        run: |
+          ready=true
+          for exe in \
+            FromChat-Installer.exe \
+            FromChat-Installer-Helper.exe \
+            fromchat-portable-launcher.exe \
+            fromchat-pack.exe \
+            fromchat-icon-patch.exe
+          do
+            if [[ ! -f "app/desktop/windows-setup/target/release/$exe" ]]; then
+              echo "Missing $exe"
+              ready=false
+            fi
+          done
+          echo "ready=$ready" >> "$GITHUB_OUTPUT"
       - name: Build Windows installer Rust tooling
-        if: steps.rust-tools-cache.outputs.cache-hit != 'true'
+        if: steps.rust-binaries.outputs.ready != 'true'
         shell: bash
         run: ./gradlew :app:desktop:buildWindowsSetupRust --no-daemon --console=plain
+      - uses: ./.github/actions/save-windows-rust-cache
+        if: always()
       - uses: actions/upload-artifact@v5
         with:
           name: windows-rust-tools