[INT-006] Google Docs MCP Server

[quaid]

Story

As a developer, I need an MCP server for Google Docs API so that PseudoScribe can read and write Google Docs.

Acceptance Criteria

• MCP server with Google Docs API v1 integration
• Service account authentication (server-to-server)
• docs_read tool - fetch document content
• docs_write tool - create/update document
• docs_list tool - list accessible documents
• Handle Google Docs JSON structure
• Unit tests with mocked API responses

Technical Notes

• Use Google service account credentials (JSON key file)
• Store credentials per tenant
• Handle rate limiting and quotas
• MCP server lives in this repo

Dependencies

• INT-001 (Content Connector Base)

Points: 3
Type: Feature
Branch: feature/INT-006