feat(jepsen): complete kubevirt release gate (#71)

* feat(jepsen): add kubevirt backend and watcher

* feat(jepsen): complete kubevirt release gate

Stabilize the KubeVirt Jepsen runner, add the final gate report, and keep the generated artifacts repo-local but ignored while preserving the fully green 15-run matrix evidence.

* fix(jepsen): satisfy ci clippy checks

* fix(jepsen): address kubevirt review blockers

Author: skel84

.gitignore

@@ -14,6 +14,7 @@
 # Test and benchmark artifacts
 /criterion/
 /flamegraph.svg
+/.artifacts/
 
 # Editor and OS files
 .DS_Store

Cargo.lock

@@ -7,6 +7,7 @@ rust-version.workspace = true
 [dependencies]
 allocdb-core = { path = "../allocdb-core" }
 base64 = "0.22.1"
+env_logger = "0.11.8"
 libc = "0.2.177"
 log = "0.4.28"