docs: adopt system-health-check workflow and host inventories

The workflow and the four host capability inventories move here from the home project. System maintenance is archsetup's domain, and this puts the thresholds TOML and both of its consumers in one repo.

The workflow's prose severity rules now cite the installed TOML keys, and the TOML wins on disagreement. Inventory paths point at docs/homelab-inventory/. A note routes routine ratio/velox checks to the maint CLI, leaving this workflow for the non-Arch hosts and forensic deep dives.

Only the #+HOSTNAME: capability inventories moved (ratio, velox, mybitch, truenas, plus the truenas hardware-specs asset they link). The personal gear records stay in home, and the home-side removal is handed off through its inbox.

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+#+TITLE: truenas - NAS/Storage Server
+#+DATE: 2026-01-27
+#+HOSTNAME: truenas
+
+* Automated Capabilities
+
+# Maintained by the system-health-check workflow. Manual edits may be
+# overwritten when the workflow detects drift between this drawer and the
+# live system. Machine-readable capability signals used to dispatch which
+# checks run on this host.
+#
+# NOTE: TrueNAS SCALE is middleware-managed. No user-level package manager
+# or topgrade orchestration. Snapshot and update operations go through the
+# TrueNAS UI / API, not pacman/apt.
+
+:PROPERTIES:
+:FS:         zfs
+:PM:         none
+:ORCH:       none
+:SNAPSHOT:   zfs-native
+:MESH:       tailscale
+:BACKUP:     target
+:VIRT:       docker
+:INIT:       systemd
+:LAST_AUDIT: 2026-04-21
+:END:
+
+* Overview
+
+| Field    | Value                                   |
+|----------+-----------------------------------------|
+| Hostname | truenas (truenas.local / 192.168.86.5)  |
+|----------+-----------------------------------------|
+| Type     | NAS / storage server                    |
+|----------+-----------------------------------------|
+| OS       | TrueNAS                                 |
+|----------+-----------------------------------------|
+| Purpose  | Media storage, backups, Plex, Syncthing |
+|----------+-----------------------------------------|
+
+See [[file:2026-01-05-truenas-hardware-specs.org][TrueNAS Hardware Specs]] for full sysinfo output.
+
+* CPU
+
+| Field         | Value                |
+|---------------+----------------------|
+| Model         | Intel Core i9-9900K  |
+|---------------+----------------------|
+| Architecture  | Coffee Lake          |
+|---------------+----------------------|
+| Cores/Threads | 8 cores / 16 threads |
+|---------------+----------------------|
+| Base/Boost    | 3.60 GHz / 5.00 GHz  |
+|---------------+----------------------|
+
+* Memory
+
+| Field | Value       |
+|-------+-------------|
+| Total | 64 GiB DDR4 |
+|-------+-------------|
+
+* Storage
+
+| Pool      | Config          | Raw Size   | Purpose       |
+|-----------+-----------------+------------+---------------|
+| boot-pool | Mirror          | ~1.9 TB x2 | System        |
+|-----------+-----------------+------------+---------------|
+| sysdata   | NVMe            | ~1.8 TB    | System data   |
+|-----------+-----------------+------------+---------------|
+| vault     | RAIDZ1 (4 disk) | ~43.6 TB   | Primary media |
+|-----------+-----------------+------------+---------------|
+| tank      | RAIDZ1 (4 disk) | ~72.8 TB   | Expansion     |
+|-----------+-----------------+------------+---------------|
+
+Total raw: ~122 TB
+
+*** Vault Datasets
+| Dataset    | Size  |
+|------------+-------|
+| Media      | 30 TB |
+|------------+-------|
+| Lectures   | 15 TB |
+|------------+-------|
+| Audiobooks | 14 TB |
+|------------+-------|
+| Magic      | 15 TB |
+|------------+-------|
+| Books      | 14 TB |
+|------------+-------|
+
+* Network
+
+| Interface | Chipset      | Speed  | Status       |
+|-----------+--------------+--------+--------------|
+| eno1      | Intel I219-V | 1 GbE  | Current      |
+|-----------+--------------+--------+--------------|
+| enp2s0    | Intel I211   | 1 GbE  | Available    |
+|-----------+--------------+--------+--------------|
+| (pending) | Intel I226-V | 2.5GbE | Ordered, NIC |
+|-----------+--------------+--------+--------------|
+
+* Motherboard
+
+| Field   | Value      |
+|---------+------------|
+| Chipset | Intel Z390 |
+|---------+------------|
+
+* Services
+
+- Plex Media Server
+- Syncthing
+- Tailscale