Update comprehensive test coverage:
- E2E tests with scheduler integration
- Integration tests with tenant isolation
- Unit tests with security assertions
- Security tests with audit validation
- Audit verification tests
- Auth tests with tenant scoping
- Config validation tests
- Container security tests
- Worker tests with scheduler mock
- Environment pool tests
- Load tests with distributed patterns
- Test fixtures with scheduler support
- Update go.mod/go.sum with new dependencies
