refactor: simplify stable cluster baseline

.gitea/workflows/deploy.yml

@@ -88,12 +88,8 @@ jobs:
           }
 
           ensure_import 'hcloud_server.control_plane[0]' 'k8s-cluster-cp-1'
-          ensure_import 'hcloud_server.control_plane[1]' 'k8s-cluster-cp-2'
-          ensure_import 'hcloud_server.control_plane[2]' 'k8s-cluster-cp-3'
           ensure_import 'hcloud_server.workers[0]' 'k8s-cluster-worker-1'
           ensure_import 'hcloud_server.workers[1]' 'k8s-cluster-worker-2'
-          ensure_import 'hcloud_server.workers[2]' 'k8s-cluster-worker-3'
-          ensure_import 'hcloud_server.workers[3]' 'k8s-cluster-worker-4'
 
       - name: Terraform Plan
         id: plan

README.md

@@ -179,6 +179,20 @@ Set these in your Gitea repository settings (**Settings** → **Secrets** → **
 
 This repo uses Flux for continuous reconciliation after Terraform + Ansible bootstrap.
 
+### Stable private-only baseline
+
+The current default target is a deliberately simplified baseline:
+
+- `1` control plane node
+- `2` worker nodes
+- private Hetzner network only
+- Tailscale for operator access
+- Flux-managed core addons only
+
+Detailed phase gates and success criteria live in `STABLE_BASELINE.md`.
+
+This is the default until rebuilds are consistently green. High availability, public ingress, and app-layer expansion come later.
+
 ### Runtime secrets
 
 Runtime cluster secrets are moving to Doppler + External Secrets Operator.
@@ -222,6 +236,20 @@ Terraform/bootstrap secrets remain in Gitea Actions secrets and are not managed
 - Core infrastructure addons are Flux-managed from `infrastructure/addons/`.
 - Active Flux addons include `addon-ccm`, `addon-csi`, `addon-tailscale-operator`, `addon-tailscale-proxyclass`, `addon-external-secrets`, `addon-observability`, and `addon-observability-content`.
 - Ansible is limited to cluster bootstrap, private-access setup, and prerequisite secret creation for Flux-managed addons.
+- `addon-flux-ui` is optional for the stable-baseline phase and is not a blocker for rebuild success.
+
+### Stable baseline acceptance
+
+A rebuild is considered successful only when all of the following pass without manual intervention:
+
+- Terraform create succeeds for the default `1` control plane and `2` workers.
+- Ansible bootstrap succeeds end-to-end.
+- All nodes become `Ready`.
+- `hcloud-cloud-controller-manager` and `hcloud-csi` are `Ready`.
+- Required External Secrets sync successfully.
+- Tailscale private access works.
+- Grafana and Prometheus are reachable privately.
+- Terraform destroy succeeds cleanly or succeeds after workflow retries.
 
 ## Observability Stack
 

STABLE_BASELINE.md

@@ -0,0 +1,47 @@
+# Stable Private-Only Baseline
+
+This document defines the current engineering target for this repository.
+
+## Topology
+
+- 1 control plane
+- 2 workers
+- private Hetzner network
+- Tailscale operator access
+
+## In Scope
+
+- Terraform infrastructure bootstrap
+- Ansible k3s bootstrap
+- Flux core reconciliation
+- Hetzner CCM
+- Hetzner CSI
+- External Secrets Operator with Doppler
+- Tailscale private access
+- Observability stack
+
+## Out of Scope
+
+- HA control plane
+- public ingress or DNS
+- public TLS
+- app workloads
+- DR / backup strategy
+- upgrade strategy
+
+## Phase Gates
+
+1. Terraform apply completes for the default topology.
+2. k3s server bootstrap completes and kubeconfig works.
+3. Workers join and all nodes are Ready.
+4. Flux source and infrastructure reconciliation are healthy.
+5. CCM is Ready.
+6. CSI is Ready and a PVC can bind.
+7. External Secrets sync required secrets.
+8. Tailscale private access works.
+9. Observability is healthy and reachable privately.
+10. Terraform destroy succeeds cleanly or via workflow retry.
+
+## Success Criteria
+
+The baseline is considered stable only after two consecutive fresh rebuilds pass all phase gates with no manual fixes.

terraform/variables.tf

@@ -25,7 +25,7 @@ variable "cluster_name" {
 variable "control_plane_count" {
   description = "Number of control plane nodes"
   type        = number
-  default     = 3
+  default     = 1
 }
 
 variable "control_plane_type" {
@@ -37,7 +37,7 @@ variable "control_plane_type" {
 variable "worker_count" {
   description = "Number of worker nodes"
   type        = number
-  default     = 4
+  default     = 2
 }
 
 variable "worker_type" {