…ules

- Added maxEventsPerCycle parameter to EventPropagator to control the number of events processed per cycle.
- Updated handleQueuedEvents and recoverPendingEvents methods to respect the maxEventsPerCycle limit.
- Introduced tests for EventPropagator to ensure correct behavior with event batching.

feat: implement role-based access control in circuit breaker and governance

- Added access module for role management including ADMIN, OP, AUD, and PAUSE_GUARD roles.
- Updated trip and reset functions in circuit breaker to enforce role checks.
- Enhanced governance proposal and approval functions to allow operators and admins to act as signers.

ci: add continuous integration workflow for testing

- Created GitHub Actions workflow to run tests for both engine-bridge (Node.js) and engine-core (Rust).
- Configured steps for checking out code, setting up Node.js and Rust environments, and running tests.

test: add unit tests for EventPropagator event batching

- Implemented tests for EventPropagator to verify that it respects the maxEventsPerCycle during recovery.
- Ensured proper cleanup of test artifacts after running tests.