Add Cucumber Tests

This generates Cucumber BDD feature files using Tzatziki, a step definition library for Java/Spring projects that covers HTTP, JPA, Kafka, MongoDB, OpenSearch, and other common integration points. The workflow is disciplined: it reads your functional spec, checks which Tzatziki modules you already depend on, then writes scenarios using only the step patterns that actually exist in your classpath. No invented Gherkin that fails at runtime. It defaults to YAML doc strings for readability, prefers updating existing scenarios over duplicating setup, and will suggest edge cases like service timeouts or empty collections after covering your spec. Best for teams already using Tzatziki or willing to adopt it, since the steps are tightly coupled to that library's regex patterns.