ci(publish): install chromium for phase 2 browser gates in PyPI publish (#57)

make public-preflight runs the Phase 2 browser gates, which need
Playwright chromium.  0.8.3 added DSH client bundle / scheduler browser
gates, so the publish workflow now hits the same chromium requirement
that release-check already installs.  Add the install step before the
preflight so the PyPI publish workflow does not fail on the missing
browser binary.

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

Author: AgentArcLab

.github/workflows/publish-pypi.yml

@@ -66,6 +66,9 @@ jobs:
       - name: Sync KsADK Web static assets
         run: make sync-ksadk-web-static
 
+      - name: Install Chromium for Phase 2 browser gates
+        run: uv run playwright install --with-deps chromium
+
       - name: Run public release preflight
         if: env.PUBLISH_TARGET == 'full'
         run: make public-preflight