fix(dependencies): address PR review findings

- Read the MetalLB speaker tag check from the managed host with slurp
  instead of a controller-side file lookup, and match the full image
  reference
- Restore the tigera-operator namespace on the Calico operator Deployment
  wait while keeping the managed CRD waits cluster-scoped
- Make Molecule verify inputs durable and scenario-specific via a
  per-scenario verify-vars.yml, driven by explicit verify_cni/verify_lb
  values instead of non-persisted converge facts
- Rename the kube-vip multi-peer BGP env var from bgppeers to bgp_peers
  and vip_cidr to vip_subnet so v1.2.2 actually reads them
- Map the legacy Cilium routed mode to tunnel and stop passing the alias
  directly to the chart
- Use return-code based failed_when on apply and preflight commands so
  non-error failures are no longer treated as success
- Clarify the sequential K3s upgrade path and backups in the README
- Add kube-vip and MetalLB regression tests and a Cilium mode mapping unit

.github/scripts/test-metallb-remote-read.sh

@@ -0,0 +1,29 @@
+#!/usr/bin/env bash
+
+set -Eeuo pipefail
+
+repo_root="$(git rev-parse --show-toplevel)"
+metallb_task="$repo_root/roles/k3s_server/tasks/metallb.yml"
+
+# The speaker tag verification must read the rendered manifest on the managed
+# host with slurp. A controller-side lookup('ansible.builtin.file', ...) would
+# read from the Ansible control node, which does not have the file, and would
+# fail on every MetalLB scenario.
+grep -Fq -- 'ansible.builtin.slurp' "$metallb_task" || {
+  printf 'MetalLB speaker tag check does not use slurp on the managed host\n' >&2
+  exit 1
+}
+
+grep -Eq -- 'lookup\(.?ansible\.builtin\.file' "$metallb_task" && {
+  printf 'MetalLB speaker tag check uses a controller-side file lookup\n' >&2
+  exit 1
+}
+
+# The check must reference the full image reference, not just a bare version
+# string that could appear anywhere in the manifest.
+grep -Fq -- 'quay.io/metallb/speaker:' "$metallb_task" || {
+  printf 'MetalLB speaker tag check does not match the full image reference\n' >&2
+  exit 1
+}
+
+printf 'MetalLB remote manifest read regression test passed\n'