CI: Run Operations Workbench Playwright smoke test in GitHub Actions

[smithaldon1]

Purpose

Track the follow-up CI hardening work for the Operations Workbench Playwright smoke test added for #101.

Background

Issue #101 keeps the first browser smoke test local-only so the demo path can be made reliable before adding GitHub Actions runtime concerns. The test currently starts the local FastAPI demo API and Next.js Workbench, prepares deterministic simulator-backed demo state, and walks the manufacturer demo path in Playwright.

Acceptance Criteria

• GitHub Actions installs the web app dependencies and Playwright browser runtime.
• CI prepares deterministic demo state or lets the Playwright config prepare it reliably.
• CI runs the Operations Workbench Playwright smoke test.
• CI captures useful artifacts on failure, such as Playwright traces or reports.
• CI keeps simulator-backed demo data clearly separated from production deployment concerns.

Out of Scope

• Full browser matrix.
• Visual regression testing.
• Production deployment validation.
• Real plant connector testing.

Related Work

• Follow-up for Demo: Add Playwright smoke test for Operations Workbench demo path #101.