* fix(metallb): verify the metallb-system namespace actually exists
- change the Test metallb-system namespace task to run
k3s kubectl get namespace metallb-system instead of the bare
-n metallb-system, which printed kubectl usage and always exited 0
- add a regression test that asserts the task uses an explicit get
and fails if it ever regresses to the usage-only form
- wire the new test into pre-commit
* fix(metallb): retry the namespace check on transient kube API errors
- retry the explicit get namespace check until it succeeds
- extend the regression test to assert the retry wiring
* fix(metallb): retry the webhook endpoint check on transient kube API errors
- retry the webhook-service endpoint get until it succeeds
- extend the regression test to cover the webhook task too
Techno Tim