NF-DS-1: Spec MCP tool groups (read_page, search_notion, write ops) for public Notion API

[samscarrow]

Notion Work Item: NF-DS-1
URL: https://www.notion.so/54921b1fc41a4cf38aecfbd1e681460a

Objective
Spec + implement 6 MCP tools in cli/mcp_server.py using the public Notion API path:

• read_page
• search_notion
• update_page_properties
• append_page_content
• create_database_row
  (+ any missing 6th tool per spec)

Key context

• Repo/branch: samscarrow/notion-ai-scraper @ main
• Core work: adapters in cli/block_builder.py (public API blocks ↔ IR ↔ markdown)

Kill/Stop Condition (from work item)
Kill if public API block tree cannot reproduce page content with sufficient fidelity for agent consumption.
Stop when all 6 tools are implemented and manually tested; tool count increments from 27 → 33.