feat(crewai): add Stagehand code-mode integration

[shrey150]

Summary

• add a CrewAI agent that launches the local Stagehand code-mode MCP over stdio
• keep the MCP server attached for the complete Agent.kickoff lifecycle
• load the shared Stagehand V4 syntax guide into the agent backstory
• add a real MCPServerStdio discovery smoke and an isolated CrewAI CI job

Stack

This PR is stacked on the Mastra integration. Its diff contains only the CrewAI integration.

Lifecycle

CrewAI owns one MCPServerStdio connection for the agent invocation, allowing successive code_execute calls to share browser state. CrewAI cleans up the MCP clients when execution finishes; the discovery smoke also exercises explicit cleanup.

E2E Test Matrix

Command / flow	Observed output	Confidence / sufficiency
Build the local code-mode package, then run the CrewAI smoke in an isolated Python 3.12 environment with the reviewed requirements	CrewAI reported an MCP connection over stdio, the built server reported that it was listening, and discovery reported CrewAI MCPServerStdio discovery PASS: code_execute.	Proves CrewAI's real stdio adapter can launch the reviewed local stdio server, discover exactly one tool, receive the shared syntax guide, and clean up its client. It does not make a provider-dependent model request.
Targeted Prettier checks over the CrewAI documentation and workflow	Completed without formatting differences.	Covers the changed Markdown and YAML surface; the executed Python smoke imports and runs every changed Python module.

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	pypi/​crewai-tools@​1.15.10

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