docs: add full homelab documentation structure

docs/reference/HOMELAB_AI_CONTEXT.md

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+# Homelab AI Context Document
+
+This document gives an AI assistant full context of this homelab for infrastructure questions, deployments, debugging, and planning.
+
+See the individual docs in this repo for detailed information:
+
+- [Architecture Overview](../architecture/ARCHITECTURE_OVERVIEW.md)
+- [Networking Model](../architecture/NETWORKING_MODEL.md)
+- [Hardware Inventory](../architecture/HARDWARE_INVENTORY.md)
+- [Services Directory](../architecture/SERVICES_DIRECTORY.md)
+- [Stack Standards](../operations/STACK_STANDARDS.md)
+- [Deployment Checklist](../operations/DEPLOYMENT_CHECKLIST.md)
+- [Storage Notes](../operations/DOCKERSTACK_STORAGE_NOTES.md)
+- [Backup Policy](../operations/BACKUP_POLICY.md)
+- [Secrets Management](../operations/SECRETS_MANAGEMENT.md)
+- [Troubleshooting](../troubleshooting/TROUBLESHOOTING.md)
+- [Known Quirks](../troubleshooting/KNOWN_QUIRKS.md)
+- [Serenity](../servers/SERENITY.md)
+- [PlausibleDeniability](../servers/PLAUSIBLEDENABILITY.md)
+- [N.O.M.A.D.](../servers/NOMAD.md)
+- [Meshtastic Stack](MESHTASTIC.md)
+- [Expansion Plan](../planning/HOMELAB_EXPANSION_PLAN.md)
+- [TODO](../planning/TODO.md)
+
+## Quick Reference
+
+### Communication Preferences
+- One command block at a time
+- Prefer scripted/automated solutions over interactive multi-step processes
+- Uses `fresh` editor (not nano) on Linux
+- Manages remote servers via SSH from Windows 11
+- Prefers MariaDB over PostgreSQL for standalone services
+
+### Three Servers
+| Server | Role | OS | IP |
+|--------|------|----|----|
+| Serenity | NAS / Media ingestion | Unraid 7.2.4 | 10.5.1.5 |
+| PlausibleDeniability | Primary Docker host | TrueNAS Scale 25.10.2.1 | LAN DHCP |
+| N.O.M.A.D. | Offline knowledge + game servers | Ubuntu 25.10 | 10.5.1.16 |
+
+### Deployment Pattern (PD)
+```bash
+cd /mnt/docker-ssd/docker/compose/<stack>
+docker compose --env-file .env config   # validate first
+docker compose --env-file .env up -d    # deploy
+docker logs <container> --tail 20       # verify
+```
+
+### Network names
+- Shared DB network: `ix-databases_shared-databases`
+- Reverse proxy network: `pangolin`
+
+### Storage decision
+- Write-heavy / DB / SQLite / GPU → `/mnt/docker-ssd/docker/appdata/<service>`
+- General config / non-fussy → `/mnt/tank/docker/appdata/<service>`
+- Media only → `/mnt/unraid/data/media/`