CI: cache Python and Windows pnpm stores

.github/workflows/ci.yml

@@ -303,9 +303,21 @@ jobs:
           install-deps: "false"
 
       - name: Setup Python
+        id: setup-python
         uses: actions/setup-python@v5
         with:
           python-version: "3.12"
+          cache: "pip"
+          cache-dependency-path: |
+            pyproject.toml
+            .pre-commit-config.yaml
+            .github/workflows/ci.yml
+
+      - name: Restore pre-commit cache
+        uses: actions/cache@v4
+        with:
+          path: ~/.cache/pre-commit
+          key: pre-commit-${{ runner.os }}-${{ steps.setup-python.outputs.python-version }}-${{ hashFiles('.pre-commit-config.yaml') }}
 
       - name: Install pre-commit
         run: |
@@ -449,9 +461,11 @@ jobs:
           cache-key-suffix: "node22"
           # Sticky disk mount currently retries/fails on every shard and adds ~50s
           # before install while still yielding zero pnpm store reuse.
+          # Try exact-key actions/cache restores instead to recover store reuse
+          # without the sticky-disk mount penalty.
           use-sticky-disk: "false"
           use-restore-keys: "false"
-          use-actions-cache: "false"
+          use-actions-cache: "true"
 
       - name: Runtime versions
         run: |