feat: add audiobook-mcp validation and fix Dockerfile

Build and validate audiobook-mcp server for audiobook management.

Changes:
- dockerfiles/audiobook-mcp/Dockerfile: Fixed esbuild ETXTBSY error
  by using 'npm install --ignore-scripts' instead of 'npm ci'
- STATUS.md: Added audiobook-mcp as validated MCP (v1.1.0, 361MB)
- AGENTS.md: Added audiobook-mcp to Productivity & Automation section

Validation:
- Container builds successfully from source
- MCP protocol handshake verified with initialize request
- Protocol version 2024-11-05 confirmed
- Server name: audiobook-library, version 1.1.0
- Requires AUDIOBOOK_ROOT environment variable

AGENTS.md

@@ -56,6 +56,14 @@ This document tracks the AI agents and MCP servers configured in this project.
 #### Productivity & Automation (6 servers)
 | Service | Container Name | Description |
 |---------|---------------|-------------|
+| audiobook-mcp | kneldevstack-aimiddleware-audiobook-mcp | Audiobook management with AI-powered features |
+| gimp-mcp | kneldevstack-aimiddleware-gimp-mcp | Image editing with GIMP 3.0, OCR support |
+| snipeit-mcp | kneldevstack-aimiddleware-snipeit-mcp | Asset inventory, maintenance tracking |
+| mcp-redmine | kneldevstack-aimiddleware-mcp-redmine | Project management, issue tracking, file operations |
+| mcp-ansible | kneldevstack-aimiddleware-mcp-ansible | IT automation playbooks |
+| elasticsearch-mcp | kneldevstack-aimiddleware-elasticsearch-mcp | Search and index management (Rust) |
+| Service | Container Name | Description |
+|---------|---------------|-------------|
 | gimp-mcp | kneldevstack-aimiddleware-gimp-mcp | Image editing with GIMP 3.0, OCR support |
 | snipeit-mcp | kneldevstack-aimiddleware-snipeit-mcp | Asset inventory, maintenance tracking |
 | mcp-redmine | kneldevstack-aimiddleware-mcp-redmine | Project management, issue tracking, file operations |