Replace hardcoded CHARON_ENCRYPTION_KEY with environment variable
substitution using Docker Compose required variable syntax.
docker-compose.playwright.yml: use ${CHARON_ENCRYPTION_KEY:?...}
docker-compose.e2e.yml: use ${CHARON_ENCRYPTION_KEY:?...}
e2e-tests.yml: add ephemeral key generation per CI run
.env.test.example: document the requirement prominently
Security: The old key exists in git history and must never be used
in production. Each CI run now generates a unique ephemeral key.
Refs: OWASP A02:2021 - Cryptographic Failures
Add comprehensive E2E testing infrastructure including:
docker-compose.playwright.yml for test environment orchestration
TestDataManager utility for per-test namespace isolation
Wait helpers for flaky test prevention
Role-based auth fixtures for admin/user/guest testing
GitHub Actions e2e-tests.yml with 4-shard parallelization
Health check utility for service readiness validation
Phase 0 of 10-week E2E testing plan (Supervisor approved 9.2/10)
All 52 existing E2E tests pass with new infrastructure
