Vertical: Developer tooling

A contract-driven compatibility engine: declare a WordPress/WooCommerce/PHP matrix in YAML, get a deterministic run with SARIF, JUnit, JSON and Markdown reports and a stable exit-code contract.

Provider-neutral primitives for testing retry, replay and webhook-signature behaviour offline — including a negative test proving the idempotency assertion actually fails when it should.

A validated set of WordPress Playground blueprints plus a schema-validating CLI, so a reviewer can boot any project in a browser instead of installing it.