docs: add workstation health report and spec baseline

docs/tech/workstation-health.md

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+---
+description: Workstation health and specification baseline
+tags: [infrastructure, health-check, workstation]
+last_updated: 2026-03-06
+---
+
+# Workstation Health Report: mw-manjaro-pf
+
+## System Specification Baseline
+- **CPU**: AMD Ryzen 7 2700X (16 Threads) @ 3.9 GHz Max
+- **Memory**: 62 GiB RAM
+- **Primary Disk**: 512 GB NVMe SSD (SAMSUNG MZVL2512HCJQ)
+- **Secondary Disk**: 500 GB SATA SSD (Samsung 840 EVO) -> `/home/mw/models`
+- **OS**: Manjaro Linux (Kernel 6.12)
+
+## Current Health Status (2026-03-06)
+- **Disk Usage (/)**: 75% (333G used, 113G free)
+- **Maintenance**: 
+  - Orphaned packages cleaned (ninja, texlive components, etc.)
+  - Logs vacuumed
+  - pnpm store pruned
+  - Docker environment verified (22 active containers for PHP/Firebird dev)
+- **Network**: tailscale0 active (100.64.0.49), enp5s0 active (192.168.0.5)
+
+## Critical Runtimes
+- Python: 3.14.3
+- Node.js: v25.6.1
+- Ansible: core 2.20.2
+- Docker: 29.2.1