Add server-writbase

[RusDyn]

Summary

• Adds @mcp-get-community/server-writbase — a lightweight stdio-to-streamable-HTTP proxy for WritBase
• WritBase is an MCP-native task management system for AI agent fleets: Postgres-backed, multi-agent permissions, full provenance, inter-agent delegation
• 11 MCP tools (info, get_tasks, add_task, update_task, manage_agent_keys, manage_agent_permissions, get_provenance, manage_projects, manage_departments, subscribe, discover_agents)
• The proxy is ~120 LOC with zero business logic — it bridges stdio↔HTTP using @modelcontextprotocol/sdk
• WritBase is Apache 2.0 licensed; this proxy package is MIT (matching repo convention)
• Repo: https://github.com/Writbase/writbase

Test plan

• npm run build succeeds with no errors
• Manual: WRITBASE_URL=... WRITBASE_AGENT_KEY=... npx @mcp-get-community/server-writbase connects and proxies tool calls

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