Fix services-check and update docs for Frigate migration to ringtail (#218)

## Summary
- Move mosquitto, ntfy, frigate, frigate-notify pod checks from `minikube-indri` to `k3s-ringtail` context in `services-check`
- Add `nvidia-device-plugin` pod check for ringtail k3s
- Rename "Kubernetes pods" section to "Indri minikube pods" for clarity
- Update 8 documentation files to reflect the migration completed in PRs #216/#217

## Files Changed
| File | Change |
|------|--------|
| `mise-tasks/services-check` | Move 4 pod checks to k3s-ringtail, add nvidia-device-plugin |
| `docs/reference/services/frigate.md` | Image→tensorrt, detector→ONNX/CUDA, shm→512Mi |
| `docs/reference/infrastructure/ringtail.md` | List actual k3s workloads |
| `docs/reference/infrastructure/indri.md` | Note frigate migration |
| `docs/explanation/architecture.md` | Add ringtail to diagram + compute layer |
| `docs/reference/kubernetes/cluster.md` | Note two clusters, add k3s section |
| `docs/reference/reference.md` | Update frigate/ntfy location |
| `docs/how-to/plans/completed/operationalize-reolink-camera.md` | Add post-completion migration note |
| `CLAUDE.md` | Add k3s-ringtail context guidance |

## Test plan
- [ ] `mise run services-check` — all checks pass
- [ ] Review each doc for accuracy against deployed state

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Reviewed-on: https://forge.ops.eblu.me/eblume/blumeops/pulls/218

docs/reference/infrastructure/indri.md

@@ -1,6 +1,6 @@
 ---
 title: Indri
-modified: 2026-02-09
+modified: 2026-02-19
 tags:
   - infrastructure
   - host
@@ -32,7 +32,7 @@ Primary BlumeOps server. Mac Mini M1 (2020).
 - [[caddy]] - Reverse proxy for `*.ops.eblu.me`
 
 **Kubernetes (via minikube):**
-- [[apps|All k8s applications]]
+- [[apps|Most k8s applications]] (Frigate, Mosquitto, ntfy migrated to [[ringtail]] k3s)
 
 **GUI Applications (manual start required):**
 - Docker Desktop - Container runtime for minikube

docs/reference/infrastructure/ringtail.md

@@ -63,7 +63,13 @@ Sync order: `1password-connect-ringtail` -> `external-secrets-crds-ringtail` ->
 
 ### Workloads
 
-No k8s workloads currently deployed. K3s is available for future workloads (e.g. Frigate, running nix-built containers).
+| Workload | Namespace | Notes |
+|----------|-----------|-------|
+| [[frigate]] | `frigate` | NVR with GPU-accelerated detection (RTX 4080) |
+| [[frigate]]-notify | `frigate` | MQTT-to-ntfy alert bridge |
+| Mosquitto | `mqtt` | MQTT broker for Frigate events |
+| [[ntfy]] | `ntfy` | Push notification server |
+| nvidia-device-plugin | `nvidia-device-plugin` | Exposes GPU to pods via CDI + nvidia RuntimeClass |
 
 ### Manual Cluster Registration