Update docs: motherboard swap, NVMe cache pool, Docker migration

- New motherboard installed, MAC/DHCP updated
- 3x Samsung 990 EVO Plus 1TB NVMe cache pool (ZFS RAIDZ1)
- Docker migrated from HDD loopback to NVMe ZFS storage driver
- disk1 confirmed dead (clicking heads), still on parity emulation
- Hardware inventory, changelog, and incident report updated

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docs/CHANGELOG.md

@@ -4,6 +4,22 @@
 
 ---
 
+## 2026-02-24
+
+### Motherboard Replacement & NVMe Cache Pool
+- **[HARDWARE]** Replaced XTRM-U motherboard — new MAC `38:05:25:35:8E:7A`, DHCP lease updated on MikroTik
+- **[HARDWARE]** Confirmed disk1 (10TB HGST HUH721010ALE601, serial 2TKK3K1D) mechanically dead — clicking heads, fails on multiple SATA ports and new motherboard
+- **[STORAGE]** Created new Unraid-managed cache pool: 3x Samsung 990 EVO Plus 1TB NVMe, ZFS RAIDZ1 (~1.8TB usable)
+- **[STORAGE]** Pool settings: autotrim=on, compression=on
+- **[DOCKER]** Migrated Docker from btrfs loopback image (disk1 HDD) to ZFS on NVMe cache pool
+- **[DOCKER]** Docker now uses ZFS storage driver directly on `cache/system/docker` dataset
+- **[DOCKER]** Recreated `dockerproxy` bridge network, rebuilt all 39 container templates
+- **[DOCKER]** Restarted Dockge and critical stacks (adguardhome, ntfy, gitea, woodpecker, etc.)
+- **[STORAGE]** Deleted old `docker.img` (200GB) from disk1
+- **[INCIDENT]** disk1 still running in parity-emulated mode — replacement drive needed
+
+---
+
 ## 2026-02-14
 
 ### CAP XL ac Recovery