Rewrite build_distrib.py to package pre-built artifacts into a wheel

The old script searched for multiple Python installations and drove a
full build + setup.py bdist_wheel — all of that is now the CI matrix's
job. The new build_distrib.py does the one thing that still belongs
here: package the pre-built cefpython3/ directory into a .whl using
stdlib only (zipfile/hashlib), with correct dist-info/RECORD hashes.

The CI wheel job now mirrors the test job (checkout, setup-python,
download artifact, copy, build_distrib.py). Timeout drops 60 -> 15 min.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: linesight

.github/workflows/ci-windows.yml

@@ -113,7 +113,7 @@ jobs:
   wheel:
     needs: test
     runs-on: windows-latest
-    timeout-minutes: 60
+    timeout-minutes: 15
     strategy:
       fail-fast: false
       matrix:
@@ -127,33 +127,21 @@ jobs:
         uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python-version }}
-          cache: 'pip'
-
-      - name: Read CEF version
-        id: cef-version
-        run: |
-          $ver = (Select-String -Path src/version/cef_version_win.h `
-                  -Pattern '#define CEF_VERSION "([^"]+)"').Matches[0].Groups[1].Value
-          echo "value=$ver" >> $env:GITHUB_OUTPUT
 
-      - name: Cache CEF binaries
-        uses: actions/cache@v4
-        if: ${{ inputs.bypass_cache != true }}
+      - name: Download build artifacts
+        uses: actions/download-artifact@v4
         with:
-          path: build/cef_binary_*
-          key: cef-windows64-${{ steps.cef-version.outputs.value }}
-
-      - name: Install build tools
-        run: python tools/requirements.py
-
-      - name: Download CEF binaries
-        run: python tools/download_cef.py
+          name: build-py${{ matrix.python-version }}-win64
+          path: build/artifacts/
 
-      - name: Prepare prebuilt CEF
-        run: python tools/automate.py --prebuilt-cef
+      - name: Set up cefpython3 package
+        run: |
+          Get-ChildItem build/artifacts/ | ForEach-Object {
+            Copy-Item $_.FullName cefpython3/ -Recurse -Force
+          }
 
       - name: Build wheel
-        run: pip wheel --no-build-isolation -w build/dist .
+        run: python tools/build_distrib.py
 
       - name: Upload wheel artifact
         uses: actions/upload-artifact@v4