All 3 k3s nodes re-provisioned to Debian 13 (kernel 6.12) via immutable tofu -replace, one at a time, leader/primary last. variables.tf image defaults -> trixie generic. k3s_server role: ensure /etc/rancher/k3s exists (fresh-node re-provision fix). Co-Authored-By: Claude Opus 4.8 <[email protected]>