Add Phase 3 live observability deployment docs

docs/phase-3-live-deployment.md

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+# Phase 3 — Live Deployment Notes
+
+## Overview
+
+Phase 3 focused on moving Ced’s Observability Stack from documentation into a working live monitoring environment.
+
+The goal was to verify that Prometheus could collect real metrics from Ced’s HomeLab infrastructure and that Grafana could visualize those metrics through live dashboards.
+
+---
+
+## Environment
+
+| System | Purpose |
+|---|---|
+| Prometheus CT | Metrics collection |
+| Grafana CT | Dashboard visualization |
+| Blackbox Exporter | Service availability checks |
+| Node Exporter | Host-level metrics |
+| Unpoller / UniFi Exporter | UniFi network metrics |
+| TrueNAS Graphite Exporter | TrueNAS metrics |
+| Proxmox HA Cluster | Virtualization platform |
+| 12-node K3s Cluster | Kubernetes environment |
+
+---
+
+## Completed Work
+
+- Verified Prometheus target health
+- Repaired Blackbox Exporter configuration
+- Added custom Blackbox modules
+- Fixed HTTP probing for internal services
+- Verified Proxmox node exporter targets
+- Verified K3s node exporter targets
+- Installed UniFi exporter using Unpoller
+- Verified UniFi metrics on port 9130
+- Confirmed all Prometheus targets are UP
+- Verified Grafana dashboards are receiving live data
+
+---
+
+## Services Confirmed Working
+
+| Component | Status |
+|---|---|
+| Prometheus | UP |
+| Blackbox Exporter | UP |
+| Proxmox Node Exporters | UP |
+| K3s Node Exporters | UP |
+| Windows Exporter | UP |
+| TrueNAS Graphite Exporter | UP |
+| UniFi Exporter / Unpoller | UP |
+| Grafana Dashboards | Partially complete and receiving live data |
+
+---
+
+## Key Outcome
+
+At the end of this phase, Ced’s Observability Stack successfully collected metrics from multiple platforms across the homelab environment.
+
+This moved the project from a documentation-only repo into a real operating observability system.