docs: distill the retired workstation's KB pages into general pages

Frank's call: no per-host graveyard. The four /system/dankware/ pages carried
two pieces of knowledge that outlive the box, and one that does not.

Distilled:
- omp-docs/system/network.md (new) — LAN topology plus the multi-link resolver
  law: a client with two +DefaultRoute links flaps its DNS, and the fix is a
  static per-connection resolver, not resolved.conf. Keeps the
  flush-caches-loop verification, because one successful dig proves nothing.
- omp-docs/tools/niri/displays.md (new) — the multi-monitor rig: portrait
  transforms, absolute positions, auto-placed third panel, the iGPU
  render-node pin, and the three failure modes (duplicate output blocks,
  positions that do not reflow, a mode the panel cannot drive).

Dropped: the machine's own spec sheet (CPU/GPU/PCI/NVMe inventory for a box
Frank sold) and its quick-facts table. The OS and userspace facts it repeated
already live in tools/cachyos.md.

omp-docs/system/dankware/ moved to .AGENTTRASH/20260928-retired-workstation/
(not deleted; git history holds it too). system/index.md and the niri index
repoint; niri's [[displays]] wikilink now resolves to the new page instead of
the trashed one. kb-lint: 0 violations.

omp-docs/system/index.md

@@ -1,15 +1,13 @@
 # System Documentation
 
 Hardware, operating system, and network documentation for the Frank Program
-infrastructure. dankware is the primary workstation; Dankserver and Dankclaw are
-the llama.cpp inference servers it talks to.
+infrastructure. A client workstation runs the desktop stack; Dankserver and
+Dankclaw are the inference servers it talks to.
 
 ## Local System
 
-- [System Overview](/system/dankware/index.md) — dankware: Alienware m16 R2 laptop running CachyOS with Niri Wayland.
-- [Hardware Specifications](/system/dankware/hardware.md) — CPU, GPU, memory, storage, network controllers, and PCI devices for dankware.
-- [Display Configuration](/system/dankware/displays.md) — Three-monitor setup: dual Samsung Odyssey G75F (portrait) plus the internal BOE panel.
-- [Network Interfaces](/system/dankware/network.md) — Wi-Fi (Intel BE202), built-in Ethernet (Killer E3000), USB Ethernet, and local network topology.
+- [Network](/system/network.md) — LAN topology, and the client-side DNS pinning rule for workstations with both Wi-Fi and Ethernet.
+- [Workstation stack](/tools/cachyos.md) — operating system, packages, and userspace; [niri](/tools/niri/index.md) for the compositor and display rig.
 
 ## Network Systems
 
@@ -20,7 +18,7 @@ the llama.cpp inference servers it talks to.
 
 ```mermaid
 graph TB
-    subgraph Local[dankware - Alienware m16 R2]
+    subgraph Local[Workstation - CachyOS + Niri]
         A[Niri Wayland]
         B[Noctalia Shell]
         C[Ghostty Terminal]
@@ -39,7 +37,7 @@ graph TB
     A --> B
 ```
 
-## Related Knowledge Bases (sibling projects on dankware)
+## Related Knowledge Bases (sibling project repos)
 
 The fleet has one sibling OKF knowledge base outside this bundle. Read it for
 deployment and inference details. This bundle links to it from the server pages.