docs: initialize NixOS infrastructure with AI assistant

Creates PROJECT.md with vision and requirements.
Creates config.json with interactive workflow mode.

.planning/PROJECT.md

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+# NixOS Infrastructure with AI Assistant
+
+## What This Is
+
+This project manages a NixOS-based infrastructure with Docker services, integrated with OpenCode AI assistant for automated management. The system supports:
+
+- Reproducible NixOS infrastructure configuration
+- Docker service management via Docker Compose
+- AI-assisted infrastructure operations
+- Automatic service deployment and lifecycle management
+- Integration with existing Docker stacks (ai, cloudstorage, homeautomation, network, passwordmanager, versioncontrol)
+
+## Core Value
+
+The core value is a **reproducible and evolvable NixOS infrastructure** that can be managed through natural language interactions with the OpenCode AI assistant. The system should automatically detect and integrate new Docker services while maintaining consistency across all deployments.
+
+## Requirements
+
+### Validated
+
+- NixOS configuration management with flakes
+- Docker service integration via docker_manager.nix
+- Traefik reverse proxy with automatic TLS certificates
+- Environment variable management via agenix secrets
+- Standardized service patterns across all Docker stacks
+
+### Active
+
+- [ ] Automatic detection and integration of new Docker Compose files in `assets/compose/`
+- [ ] AI assistant integration for service lifecycle management
+- [ ] Service health monitoring and logging verification
+- [ ] Documentation of integration patterns in SKILL.md
+- [ ] Automated system update workflow (`nh os switch`)
+
+### Out of Scope
+
+- Full n8n integration for automated workflows - deferring to future milestone
+- Self-healing infrastructure with automatic problem detection - future enhancement
+- Multi-host orchestration - single-host focus for v1
+
+## Key Decisions
+
+| Decision | Rationale | Outcome |
+|----------|-----------|---------|
+| NixOS with Flakes | Reproducible infrastructure, better dependency management | Good |
+| Docker Compose integration | Preserves existing service configurations, flexibility | Good |
+| agenix for secrets | Secure secrets management, Nix native integration | Good |
+| Traefik reverse proxy | Unified HTTPS entrypoint, automatic certificate management | Good |
+| Standardized service patterns | Consistency across services, easier maintenance | Pending |
+
+## Context
+
+- **Existing Services**: ai (Llama.cpp, Open WebUI, n8n), cloudstorage (Nextcloud), homeautomation (Home Assistant), network (Traefik, DDNS), passwordmanager (Vaultwarden), versioncontrol (Gitea)
+- **Tech Stack**: NixOS unstable, Docker, Docker Compose, Traefik, agenix, OpenCode AI
+- **Hardware**: AMD MI50 GPUs for AI workloads
+- **Network**: Traefik-net bridge network for all services
+- **Storage**: `/mnt/HoardingCow_docker_data/<service>` for persistent data
+
+**Last updated: 2026-01-01 after init**

.planning/config.json

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+{
+  "mode": "interactive",
+  "gates": {
+    "confirm_project": true,
+    "confirm_phases": true,
+    "confirm_roadmap": true,
+    "confirm_breakdown": true,
+    "confirm_plan": true,
+    "execute_next_plan": true,
+    "issues_review": true,
+    "confirm_transition": true
+  },
+  "safety": {
+    "always_confirm_destructive": true,
+    "always_confirm_external_services": true
+  }
+}