docs: add node1 runbooks, consolidation artifacts, and maintenance scripts

docs/architecture_inventory/06_OBSERVABILITY_AND_BACKUPS.md

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+# Observability and Backups
+
+## Observability Stack
+- Prometheus config: `monitoring/prometheus/prometheus.yml`.
+  - Scrapes: prometheus self, `agent-e2e-prober`, `gateway`, `router`, `qdrant`, `grafana`.
+- Alert rules: `monitoring/prometheus/rules/node1.rules.yml`.
+- Grafana provisioning and dashboards:
+  - datasources: `monitoring/grafana/provisioning/datasources/prometheus.yml`
+  - dashboards: `monitoring/grafana/dashboards/*.json`
+  - alerting: `monitoring/grafana/provisioning/alerting/alerts.yml`
+- Loki/OTel/Tempo/Jaeger: no active compose evidence in this repo’s current manifests.
+
+## Service-Level Telemetry
+- Router exposes `/metrics` (`services/router/main.py`).
+- Gateway exposes metrics endpoint (compose monitors `/metrics`).
+- SenpAI consumer has Prometheus metrics in code (`senpai_nats_connected`, reconnect counters).
+- Prober exports metrics on `9108`.
+
+## Backup and DR
+### Data backups
+- Scheduled Postgres backup container: `docker-compose.backups.yml` (`SCHEDULE: @every 6h`, keep days/weeks/months).
+- Full backup script: `scripts/backup/backup_all.sh` (Postgres dump + Qdrant snapshots + Neo4j dump + metadata file).
+- Restore validation script: `scripts/restore/restore_test.sh`.
+
+### Documentation backups
+- `scripts/docs/docs_backup.sh` creates timestamped archives and retention rotation.
+- `scripts/docs/install_local_cron.sh` installs local managed cron block for docs maintenance.
+
+## DR Readiness Notes
+- Backup script metadata and restore script provide reproducible path checks.
+- Compose-based backup path uses host bind `/opt/backups/postgres:/backups` (host-level storage requirement).
+- Runbooks report prior backup-image version mismatch issue; currently compose pins backup image `:16`.
+
+## Source pointers
+- `monitoring/prometheus/prometheus.yml`
+- `monitoring/prometheus/rules/node1.rules.yml`
+- `monitoring/grafana/provisioning/datasources/prometheus.yml`
+- `monitoring/grafana/provisioning/alerting/alerts.yml`
+- `monitoring/grafana/dashboards/nats_memory.json`
+- `docker-compose.backups.yml`
+- `scripts/backup/backup_all.sh`
+- `scripts/restore/restore_test.sh`
+- `scripts/docs/docs_backup.sh`
+- `scripts/docs/install_local_cron.sh`
+- `docs/NODA1-MEMORY-RUNBOOK.md`
+- `docs/NODA1-TECHBORGS-PATCHES.md`