Polish build flow and README formatting

- update-lockfile.yml: rename workflow to "Update lockfiles"
- release.yml: add explicit uv python install 3.13 for consistency with other workflows
- docker-publish.yml: rename cpu cache scope from linux/amd64-cpu to cpu (now multi-arch)
- README: add GitHub release version badge and License badge
- README: shorten QUALITY_REPLACEMENT table cell

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

.github/workflows/release.yml

@@ -37,6 +37,9 @@ jobs:
       - name: Install uv
         uses: astral-sh/setup-uv@v7
 
+      - name: Set up Python
+        run: uv python install 3.13
+
       - name: Verify release branch
         if: github.event_name == 'workflow_dispatch'
         run: |