Adds the containerized Playwright-based test execution environment
(Dockerfile.test, docker-compose.test.yaml) to the Technology
Architecture, which was implemented but never documented.
- Added Section 6.6 "Test Execution Environment" describing the
Docker-based Playwright setup used for local development and CI
- Added the containerized test environment to the "Key Architectural
Decisions" list
- Added a Change Log entry explaining what changed and why
Ninosaurier
669baef7d4