feat: Add Notion connector SKILL.md

[major-connector-creator]

Summary

Adds the AI Coder skill file for the Notion connector, following the established pattern from existing connectors (e.g., HubSpot, Salesforce).

Changes

New file: plugins/shared/skills/resources_notion/SKILL.md

• YAML frontmatter with name: using-notion-connector and description
• Common section: Security rules, MCP tools pattern, TypeScript client generation, invocation key rules, framework note, error handling
• MCP Tools section: Documents all 6 tools:
  • notion_search — Search pages and databases
  • notion_get_page — Get a page by ID
  • notion_query_database — Query a database with filters/sorts
  • notion_get_database — Get database schema/properties
  • notion_get_block_children — Get child blocks
  • notion_invoke — Generic HTTP request to any Notion API endpoint
• TypeScript Client section: Usage examples for the invoke method
• Tips section: Notion-specific guidance (UUIDs, pagination, rate limits, rich text)

Related PRs

• npm package: major-technology/public-packages — Notion resource client, payload builder, schema
• monorepo: major-technology/mono-builder — Go backend, API schemas, frontend panel