docs(integrations): stop recommending Corepack for pnpm

[antonvishal]

Summary

• Replace corepack pnpm@11.10.0 with plain pnpm in the v4 integration docs (overview, Mastra, Eve, Vercel AI SDK, CrewAI).
• Link the integrations overview to the official pnpm install docs.

pnpm now says not to install via Corepack (Node also stopped shipping Corepack from v25). We already pin pnpm@11.10.0 via devEngines.packageManager, and CI uses pnpm/action-setup, so the docs only used Corepack as a one-shot version pin.

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Summary by cubic

Stop recommending Corepack for pnpm in v4 integration docs and switch commands to plain pnpm. This aligns with pnpm guidance and Node 25 removing Corepack while keeping our version pinning and CI setup intact.

Review notes

• Replaced corepack pnpm@11.10.0 with pnpm in crewai.mdx, eve.mdx, mastra.mdx, vercel-ai-sdk.mdx, and overview.mdx.
• Linked the overview to the official pnpm installation docs and kept the requirement at pnpm 11.10.0.
• No code, build, or runtime changes; docs only.

^{Written for commit 2efa8a9. Summary will update on new commits.}

[changeset-bot]

⚠️ No Changeset found

Latest commit: 2efa8a9

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[cubic-dev-ai]

No issues found across 5 files

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.

Architecture diagram

sequenceDiagram
    participant Dev as Developer
    participant Docs as Integration Docs
    participant Pnpm as pnpm CLI
    participant Turbo as Turbo Build
    participant Node as Node.js Runtime
    participant CI as CI Pipeline

    Note over Dev,CI: Integration Setup Flow (Docs Updated)

    Dev->>Docs: Follow integration guide (Overview, CrewAI, Mastra, etc.)
    Docs->>Dev: Clone Stagehand repo instructions

    Dev->>Pnpm: pnpm install --frozen-lockfile
    Note over Pnpm: Uses pinned pnpm@11.10.0<br/>via devEngines.packageManager

    alt Corepack available (Node < 25)
        Pnpm->>Pnpm: Falls back to Corepack if needed
    else Corepack unavailable (Node >= 25)
        Pnpm->>Pnpm: Uses standalone pnpm binary
    end

    Pnpm-->>Dev: Dependencies installed

    Dev->>Pnpm: pnpm exec turbo run build
    Pnpm->>Turbo: Execute turbo build
    Turbo->>Node: Build integration packages
    Node-->>Turbo: Build artifacts
    Turbo-->>Dev: Build complete

    Note over Dev,CI: Runtime Execution (Integration-Specific)

    Dev->>Pnpm: pnpm --dir packages/integrations/<name> start
    Pnpm->>Node: Launch integration process
    Node->>Node: Load Stagehand MCP server
    Note over Node: CrewAI, Mastra, Vercel AI SDK<br/>use shared TS facade MCP server

    CI->>Pnpm: pnpm/action-setup (CI only)
    CI->>Pnpm: pnpm install --frozen-lockfile
    Pnpm-->>CI: Dependencies ready
    CI->>Turbo: Run CI build checks
    Turbo-->>CI: Validation results

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_{Re-trigger cubic}