feat(kb): przenosiny type=node do kb/nodes/ (6 plikow)

hosts/{piha,saturn,solaria,vps}/README.md -> kb/nodes/<node>.md
docs/hetzner-vps.md -> kb/nodes/hetzner-vps.md (deprecated, stub z 2026-04-15)
docs/hardware.md    -> kb/nodes/legacy-hardware.md (deprecated)

git mv + frontmatter, tresc nietknieta.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

kb/nodes/hetzner-vps.md

@@ -1,3 +1,13 @@
+---
+okf: "0.1"
+type: node
+visibility: private
+status: deprecated
+updated: 2026-04-15
+links: []
+superseded_by: "kb/nodes/vps.md + kb/subsystems/fleet-inventory.md (stub z 2026-04-15, sprzed floty)"
+---
+
 # Hetzner VPS
 
 ## Description

kb/nodes/legacy-hardware.md

@@ -1,3 +1,13 @@
+---
+okf: "0.1"
+type: node
+visibility: private
+status: deprecated
+updated: 2026-04-15
+links: []
+superseded_by: "hosts/<node>/capabilities.yaml + kb/subsystems/fleet-inventory.md"
+---
+
 # Hardware
 
 ## Description

kb/nodes/piha.md

@@ -1,3 +1,12 @@
+---
+okf: "0.1"
+type: node
+visibility: private
+status: active
+updated: 2026-05-07
+links: []
+---
+
 # PIHA - Infrastructure + Automation Node
 
 ## Role

kb/nodes/saturn.md

@@ -1,3 +1,12 @@
+---
+okf: "0.1"
+type: node
+visibility: private
+status: active
+updated: 2026-05-07
+links: []
+---
+
 # SATURN - Primary Development & Orchestration Node
 
 ## Role

kb/nodes/solaria.md

@@ -1,3 +1,12 @@
+---
+okf: "0.1"
+type: node
+visibility: private
+status: active
+updated: 2026-07-16
+links: []
+---
+
 # SOLARIA - Compute / GPU / Inference Node
 
 ## Role

kb/nodes/vps.md

@@ -1,3 +1,12 @@
+---
+okf: "0.1"
+type: node
+visibility: private
+status: active
+updated: 2026-05-07
+links: []
+---
+
 # VPS - Public Edge + Ingress Node
 
 ## Role