feat: add wiki knowledge layer (Phase 0 + Phase 1 seed)

Implements LLM-compiled wiki layer between raw session logs and live
CONTEXT.md, inspired by Karpathy's knowledge base workflow. Adds wiki/
directory structure, article templates, spec docs, and seeds first two
articles (Cascades of Tucson, GuruRMM) from 60+ session logs.

Updates CLAUDE.md to check wiki first on all context-loading triggers.
Captures verified ACG IP/hostname map and Neptune physical-location
clarification (Dataforth D2, subnet overlap TODO) in memory.

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

wiki/_templates/system.md

@@ -0,0 +1,42 @@
+---
+type: system
+name: <hostname>
+display_name: <Hostname>
+last_compiled: YYYY-MM-DD
+compiled_by: <session_id>
+sources: []
+backlinks: []
+---
+
+# <Hostname>
+
+## Identity
+- **Hostname:** ...
+- **IP:** ...
+- **Role:** ...
+- **Location:** Physical | VM on <host>
+- **OS:** ...
+- **Tailscale IP:** ... (if applicable)
+
+## Specs
+
+*(CPU, RAM, disk, NIC — or VM config: vCPU, vRAM, virtual disk)*
+
+## Services
+
+| Service | Port | Notes |
+|---|---|---|
+
+## Access
+- **SSH:** `ssh user@IP` (key in vault: `infrastructure/<name>/...`)
+- **RDP:** IP:port (if applicable)
+- **Console:** iDRAC / Proxmox / Unraid UI / etc.
+- **Vault path:** `infrastructure/<name>/`
+
+## Known Issues & Quirks
+
+*(Historical problems, workarounds, things that have surprised us — the stuff not in any doc)*
+
+## Backlinks
+
+*(Projects running on this system, clients whose infra lives here)*