bitdynamics-ab/canton-devkit: docs/e2e-testing.md

End-to-End Testing Unit tests (go test ./...) cover DevKit's Go logic. End-to-end (E2E) tests cover the parts that only a real invocation exercises: the DPM component surface, shelling out to dpm/daml, Docker-backed LocalNet lifecycle, and the artifacts DevKit produces on disk. The repository has…