[INT-007] Google Docs Connector Service

[quaid]

Story

As a developer, I need a GoogleDocsConnector service that implements the content connector interface for Google Docs.

Acceptance Criteria

• GoogleDocsConnector extends BaseContentConnector
• fetch_draft(doc_id) - retrieve document content
• push_content(content) - create new document
• update_content(doc_id, content) - update existing document
• list_documents(folder_id) - list documents in folder
• Google Docs JSON ↔ Markdown bidirectional conversion
• Preserve formatting (headers, lists, links, images)
• Unit tests for all operations

Technical Notes

• Google Docs uses structured JSON (paragraphs, text runs)
• Convert to Markdown for style processing
• Convert back to Docs format for writing
• Handle inline images and links

Dependencies

• INT-001 (Content Connector Base)
• INT-006 (Google Docs MCP Server)

Points: 3
Type: Feature
Branch: feature/INT-007