Backfill of molecule-core#275 (infra-lead-agent). The base
molecule-ai-workspace-runtime image (python:3.11-slim + Node.js 22)
does not include Chromium system libs (libnss3, libatk-bridge2.0-0,
etc.) to avoid inflating the image by ~200-250 MB. Documents the
user-visible error when running playwright from in-container, the
recommended CI-based E2E workflow, and the role-specific adapter
template workaround.
Closes molecule-core#275.
Co-Authored-By: Documentation Specialist <noreply@moleculesai.app>