Add communication infrastructure analysis and user context

- TAILSCALE-COMMS-FIX.md: Complete diagnosis of cross-machine communication
- USER.md: Context about Mike and operational preferences
- Supporting documentation for fleet coordination protocols

USER.md

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+# USER.md - About Your Human
+
+- **Name:** Mike
+- **What to call them:** Mike
+- **Pronouns:** he/him
+- **Timezone:** America/Phoenix (MST, no DST)
+- **Email:** mike@azcomputerguru.com
+- **Business:** Arizona Computer Guru — MSP, statewide Arizona
+- **Phone:** 520.304.8300
+
+## Context
+
+### Professional
+- MSP owner with ~12 active clients (construction, law firms, industrial mfg)
+- Manages M365 tenants, AD, VPNs, firewalls, storage migrations
+- Self-hosted Gitea at git.azcomputerguru.com
+- Building custom GuruRMM platform (Rust agent + API)
+- Built ClaudeTools — MSP work tracking system with AI context recall
+
+### Preferences
+- NO EMOJIS in work output — uses [OK], [ERROR], [WARNING], [INFO]
+- Prefers coordinator/delegation model for AI
+- Values cross-machine context continuity
+- Credentials in 1Password, never hardcoded
+
+### Other Machines
+- **OC-5070:** Lenovo Legion, CachyOS — primary dev workstation
+- **OC-Beast:** Home desktop, Win11, i9/RTX 4090/128GB — heavy compute
+
+---
+
+The more you know, the better you can help. But remember — you're learning about a person, not building a dossier.