docs(mailchimpmcp): add Mailchimp MCP connector documentation

[Pranesh-Raghu]

Summary

• Adds documentation for the Mailchimp MCP connector (mailchimpmcp), an MCP connector that connects to Mailchimp's email marketing platform via OAuth 2.1 with PKCE.
• 56 tools across 11 categories: Account, Audiences, Members, Merge Fields, Interest Categories & Interests, Segments, Tags, Campaigns, Templates, Automations, and Reports & Analytics.

Stub disclosure

_setup-mailchimpmcp.mdx and _section-after-setup-mailchimpmcp-common-workflows.mdx are cloned from the atlassianmcp template. Before merging, these stubs need:

• (a) Real screenshots replacing the {/* TODO: add screenshot ... */} markers
• (b) Review and rewrite of the connector-specific setup steps — the current content describes Atlassian DCR registration steps, not Mailchimp's OAuth 2.1 + PKCE flow

Preview link

https://deploy-preview-789--scalekit-starlight.netlify.app/agentkit/connectors/mailchimpmcp/

Test plan

• Open the preview link and verify the page renders.
• Tool list shows 56 tools.
• Replace {/* TODO: add screenshot ... */} markers in _setup-mailchimpmcp.mdx.
• Review and rewrite the setup steps in _setup-mailchimpmcp.mdx for Mailchimp's OAuth 2.1 + PKCE flow (remove Atlassian DCR references).
• Review _section-after-setup-mailchimpmcp-common-workflows.mdx and update common workflow examples for Mailchimp use cases.

Notes

• The live Mailchimp MCP server (https://ai-inc.mailchimp.com/claude/mcp/v2) blocks Scalekit proxy IPs via Akamai WAF, so live tool testing was not performed. Tools are sourced from official Mailchimp Marketing API v3 docs.
• Related tool-agent PR: https://github.com/scalekit-inc/tool-agent/pull/348
• The Astro build fails in this environment due to a pre-existing missing @astrojs/markdown-remark dependency issue on main (confirmed unrelated to these changes).

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch add-mailchimpmcp-connector-docs

• 🛠️ fix frontmatter
• 🛠️ fix internal links

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