Port the observability platform to k3s and ship czy logs to it

k8s/ is now a faithful port of the mentor's Ansible Grafana stack
(Prometheus, Alertmanager, Loki, Tempo, Alloy, Grafana, node-exporter)
for the ledgerline-observability namespace on falken: same versions and
configs, one *.vione.cloud ingress per tool behind Traefik basic auth,
secrets generated by create-secrets.sh into gitignored files.

Two fixes over the Ansible role, both verified live: Tempo's
metrics-generator needs traces_storage or it runs no processors, and
Prometheus needs exemplar-storage to keep exemplars.

Ledgerline stays on czy; an Alloy agent in the Traefik override ships
its container logs to Loki. Roadmap and CLAUDE.md now point at k8s/.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

k8s/alloy/deployment.yaml

@@ -0,0 +1,47 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: alloy
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: alloy
+  template:
+    metadata:
+      labels:
+        app: alloy
+    spec:
+      containers:
+        - name: alloy
+          image: grafana/alloy:v1.10.2
+          args:
+            - run
+            - --server.http.listen-addr=0.0.0.0:12345
+            - --storage.path=/var/lib/alloy/data
+            - /etc/alloy/config.alloy
+          ports:
+            - containerPort: 12345
+            - containerPort: 4317
+            - containerPort: 4318
+          readinessProbe:
+            httpGet:
+              path: /-/ready
+              port: 12345
+          resources:
+            requests:
+              cpu: 20m
+              memory: 64Mi
+            limits:
+              memory: 384Mi
+          volumeMounts:
+            - name: config
+              mountPath: /etc/alloy
+            - name: data
+              mountPath: /var/lib/alloy/data
+      volumes:
+        - name: config
+          configMap:
+            name: alloy-config
+        - name: data
+          emptyDir: {}