P8.2: Document Helm chart structure completion

The Helm chart structure was already in place with all required
files per plan §6:
- Chart.yaml with API v2 metadata
- values.yaml with dev defaults (replicas=1, RF=1, RG=1, sqlite)
- values.schema.json for validation
- templates/ with all required resources
- tests/connection-test.yaml
- NOTES.txt with production override guidance

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

notes/miroir-qjt.2.md

@@ -0,0 +1,58 @@
+# P8.2: Helm Chart Structure Completion
+
+## Task
+Scaffold `charts/miroir/` per plan §6 with dev defaults and production override guidance.
+
+## Status: Already Complete
+
+The Helm chart structure was already in place with all required files:
+
+### Chart Structure
+- `Chart.yaml` - API v2, description, keywords, sources
+- `values.yaml` - Dev defaults (replicas=1, RF=1, RG=1, sqlite, redis disabled)
+- `values.schema.json` - JSON schema validation
+- `templates/_helpers.tpl` - Node list DNS generation helpers
+- `templates/miroir-deployment.yaml` - Miroir proxy deployment
+- `templates/miroir-service.yaml` - ClusterIP service
+- `templates/miroir-headless.yaml` - Headless service for peer discovery
+- `templates/miroir-configmap.yaml` - Miroir YAML config
+- `templates/miroir-secret.yaml` - Master keys and API keys
+- `templates/miroir-hpa.yaml` - Horizontal Pod Autoscaler
+- `templates/miroir-pvc.yaml` - CDC buffer PVC (conditional)
+- `templates/meilisearch-statefulset.yaml` - Meilisearch StatefulSet
+- `templates/meilisearch-service.yaml` - Meilisearch service
+- `templates/redis-deployment.yaml` - Redis deployment (optional)
+- `templates/serviceaccount.yaml` - ServiceAccount
+- `templates/NOTES.txt` - Post-install instructions with prod override guidance
+- `tests/connection-test.yaml` - Helm test pod
+
+### Dev Defaults (values.yaml)
+- `miroir.replicas: 1`
+- `miroir.shards: 64`
+- `miroir.replicationFactor: 1`
+- `miroir.replicaGroups: 1`
+- `miroir.hpa.enabled: false`
+- `meilisearch.replicas: 2` (1 group × 2 nodes)
+- `meilisearch.nodesPerGroup: 2`
+- `redis.enabled: false`
+- `taskStore.backend: sqlite`
+
+### Production Override Guidance (NOTES.txt)
+```
+!!! PRODUCTION UPGRADE PATH !!!
+These defaults are for dev/CI (single-pod evaluation). For production, override:
+  miroir.replicas=2+
+  miroir.replicationFactor=2
+  miroir.replicaGroups=2
+  taskStore.backend=redis
+  redis.enabled=true
+  hpa.enabled=true
+```
+
+### Node List DNS Generation (_helpers.tpl)
+- `miroir.meilisearchNodeAddress` - Generates DNS for a single node
+- `miroir.meilisearchNodeList` - Generates full node list for ConfigMap
+- Format: `http://<release>-meili-<n>.<release>-meili-headless.<namespace>.svc.cluster.local:7700`
+
+### Validation
+Chart is packaged and validated in the `miroir-release` workflow (k8s/argo-workflows/miroir-release.yaml) using `helm package`.