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/client.md

@@ -0,0 +1,56 @@
+---
+type: client
+name: <slug>
+display_name: <Human Readable Name>
+last_compiled: YYYY-MM-DD
+compiled_by: <session_id>
+sources: []
+backlinks: []
+---
+
+# <Client Display Name>
+
+## Profile
+- **Contract type:** Managed | Break-fix | Project | Prepaid block
+- **Key contacts:** Name (title, email/phone)
+- **Billing rate:** $X/hr
+- **Hours remaining (if prepaid):** N hrs as of YYYY-MM-DD
+- **Active ticket:** Syncro #XXXXX
+
+## Infrastructure
+
+### Servers & Services
+| Host | IP | Role | OS | Notes |
+|---|---|---|---|---|
+
+### Email & Identity
+- **M365 tenant:** tenant.onmicrosoft.com
+- **MX / mail flow:** ...
+- **MFA status:** ...
+
+### Network
+- **ISP / WAN:** ...
+- **Firewall:** ...
+- **VPN:** ...
+
+## Access
+- SSH: `ssh user@IP` (key in vault: `clients/<name>/...`)
+- RDP: IP:port
+- Admin URL: ...
+- Vault path: `clients/<name>/`
+
+## Patterns & Known Issues
+
+*(Recurring ticket types, common failure modes, things that always come up)*
+
+## Active Work
+
+*(Current open projects or tickets — brief, link to CONTEXT.md or ticket# for detail)*
+
+## History Highlights
+
+*(Major incidents, big projects, key decisions — one-liners with dates)*
+
+## Backlinks
+
+*(Other wiki articles related to this client)*