Add power infrastructure reference card (#138)

## Summary
- New `power.md` reference card documenting the full power chain: AC grid → Anker SOLIX F2000 battery → CyberPower CP1000PFCLCD UPS → homelab
- Lists all devices on the UPS (indri, sifaka, UniFi Express 7, Starlink)
- Replaced inline UPS entry on indri card with link to the new power card
- Added power card to reference index

Context: power chain was upgraded — the Anker battery station now sits between grid power and the UPS, providing extended runtime for grid outages.

## Test plan
- [x] docs-check-links, docs-check-index, docs-check-filenames all pass

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

Reviewed-on: https://forge.ops.eblu.me/eblume/blumeops/pulls/138

docs/changelog.d/docs-power-infrastructure.doc.md

@@ -0,0 +1 @@
+Add power infrastructure reference card documenting the battery-backed UPS chain (Anker SOLIX F2000 → CyberPower UPS → homelab).

docs/reference/infrastructure/indri.md

@@ -18,7 +18,7 @@ Primary BlumeOps server. Mac Mini M1 (2020).
 | **macOS** | 15.7.3 (Sequoia) |
 | **Tailscale hostname** | `indri.tail8d86e.ts.net` |
 | **Tailscale Tag** | `tag:homelab` |
-| **UPS** | Anker SOLIX F2000 GaNPrime |
+| **Power** | [[power|Battery-backed UPS]] |
 
 ## Services Hosted
 

docs/reference/infrastructure/power.md

@@ -0,0 +1,35 @@
+---
+title: Power
+tags:
+  - infrastructure
+---
+
+# Power Infrastructure
+
+The homelab runs on battery-backed power to survive grid outages.
+
+## Power Chain
+
+```
+AC Grid (120V) → Anker SOLIX F2000 → CyberPower CP1000PFCLCD → Homelab
+```
+
+| Stage | Device | Notes |
+|-------|--------|-------|
+| **Grid** | 120V AC mains | Charges the battery station |
+| **Battery** | Anker SOLIX F2000 GaNPrime | 2048Wh portable power station |
+| **UPS** | CyberPower CP1000PFCLCD | 1000VA / 600W, pure sine wave output |
+
+## Devices on UPS
+
+| Device | Role |
+|--------|------|
+| [[indri]] | Primary server |
+| [[sifaka]] | NAS |
+| UniFi Express 7 | WiFi router |
+| Starlink | Satellite internet uplink |
+
+## Related
+
+- [[hosts]] - Device inventory
+- [[restart-indri]] - Shutdown and startup procedure

docs/reference/reference.md

@@ -47,6 +47,8 @@ Host inventory and network configuration.
 - [[tailscale]] - ACLs, groups, tags
 - [[gandi]] - DNS hosting for `eblu.me`
 - [[routing|Routing]] - DNS domains, port mappings
+- [[power]] - Battery-backed power chain
+
 ## Kubernetes
 
 Cluster configuration and application registry.