Add inventory creation workflow guidance to MCP instructions ...

- Document that docs must be created before inventory items referencing them
- Remind agents to always use MCP tools, never direct filesystem edits

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Make docs optional in host schema and disable missing-doc-link-target validation ...

- Remove 'docs' from host.schema.json required fields
- Disable _validate_inventory_doc_links in validation.py

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Include validation issue details in pending change rollback errors ...

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Describe MCP inventory write schema

Fix MCP usage parameter guidance

Improve MCP knowledge maintenance guidance

Deploy: add nginx, systemd services, scripts, MCP info endpoint ...

- nginx reverse proxy on port 80 for UI + /api/ + /mcp/
- systemd user services: backend (8000), MCP SSE (8001)
- install.sh and deploy.sh for automated setup
- /mcp/info endpoint to expose MCP instructions and tools list
- MCP server instructions expanded for AI agent workflows
- Update server README with deployment docs

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

merge

Document proactive MCP usage for agents

Add Gnexus Book MCP server

Add broad knowledge inventory types

Add inventory relationship graph API

Add validation guardrails for agent-maintained docs

Add documentation foundation and backend maintenance API