docs(vercelmcp, latchbiomcp, profoundmcp): add Vercel MCP, Latch Bio, and Profound connector documentation

[Pranesh-Raghu]

Adds connector documentation for three MCP connectors:

1. Vercel MCP — 19 tools covering deployment management, project management, domain management, Vercel Toolbar collaboration, and Claude design import integration.
2. Latch Bio — 9 tools covering workspace and file management, workflow discovery and launching (e.g. RNAseq, omics pipelines), execution monitoring, and task log retrieval.
3. Profound — 15 read-only analytics tools for AI search visibility: visibility scores, sentiment analysis, citation tracking, prompt answers, referral traffic, and AI crawler activity — scoped to an organization's tracked categories and domains (ChatGPT, Perplexity, Google AI Overviews).

Stub disclosure

Companion files for all connectors are cloned stubs and need human review before merging:

Vercel MCP (_setup-vercelmcp.mdx, _section-after-setup-vercelmcp-common-workflows.mdx) — cloned from firecrawlmcp:

• Replace {/* TODO: add screenshot ... */} markers with real screenshots
• Review setup steps: Vercel OAuth 2.1/DCR flow via https://mcp.vercel.com, PKCE enablement, Dynamic Client Registration, scopes

Latch Bio (_setup-latchbiomcp.mdx, _section-after-setup-latchbiomcp-common-workflows.mdx) — cloned from vercelmcp:

• Replace {/* TODO: add screenshot ... */} markers with real screenshots
• Review setup steps: OAuth 2.1 DCR flow via https://mcp.latch.bio/mcp, Latch-specific scopes, app registration on the Latch platform

Profound (_setup-profoundmcp.mdx, _section-after-setup-profoundmcp-common-workflows.mdx) — cloned from latchbiomcp:

• Replace {/* TODO: add screenshot ... */} markers with real screenshots
• Review setup steps: OAuth 2.1/DCR (PKCE) flow via https://mcp.tryprofound.com/mcp, Profound-specific scopes, app registration on the Profound platform

Preview links

• Vercel MCP: https://deploy-preview-770--scalekit-starlight.netlify.app/agentkit/connectors/vercelmcp/
• Latch Bio: https://deploy-preview-770--scalekit-starlight.netlify.app/agentkit/connectors/latchbiomcp/
• Profound: https://deploy-preview-770--scalekit-starlight.netlify.app/agentkit/connectors/profoundmcp/

Test plan

• Open Vercel MCP preview link and verify the page renders
• Vercel MCP tool list shows 19 tools
• Replace {/* TODO: add screenshot ... */} markers in _setup-vercelmcp.mdx
• Review Vercel MCP setup steps for accuracy (DCR flow, PKCE, proxy URL https://mcp.vercel.com)
• Open Latch Bio preview link and verify the page renders
• Latch Bio tool list shows 9 tools
• Replace {/* TODO: add screenshot ... */} markers in _setup-latchbiomcp.mdx
• Review Latch Bio setup steps for accuracy (OAuth 2.1 DCR, Latch-specific scopes, proxy URL https://mcp.latch.bio/mcp)
• Open Profound preview link and verify the page renders
• Profound tool list shows 15 tools
• Replace {/* TODO: add screenshot ... */} markers in _setup-profoundmcp.mdx
• Review Profound setup steps for accuracy (OAuth 2.1/DCR PKCE, proxy URL https://mcp.tryprofound.com/mcp)

Related PRs

• Vercel MCP tool-agent PR: https://github.com/scalekit-inc/tool-agent/pull/312
• Latch Bio tool-agent PR: https://github.com/scalekit-inc/tool-agent/pull/333
• Profound tool-agent PR: https://github.com/scalekit-inc/tool-agent/pull/339

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