[fix]: import ToolSet from ai public export

[seanmcguire12]

thanks @asim48-ctrl for the contribution!

Summary

• replace the remaining ai/dist deep import with the public ai package export
• aligns AgentProvider with the other Stagehand v3 CUA files that already import ToolSet from ai

Fixes #1531.

Verification

• corepack pnpm install --ignore-scripts --frozen-lockfile
• corepack pnpm --filter @browserbasehq/stagehand run gen-version
• corepack pnpm --filter @browserbasehq/stagehand run build-dom-scripts
• corepack pnpm exec tsc -p packages/core/tsconfig.json --noEmit
• corepack pnpm exec prettier --check packages/core/lib/v3/agent/AgentProvider.ts
• git diff --check

---

Summary by cubic

Switch AgentProvider to import ToolSet from the public ai export instead of ai/dist to prevent deep import breakage. Adds a patch changeset and aligns with other Stagehand v3 CUA files; fixes #1531.

^{Written for commit 1c17675. Summary will update on new commits.}

[changeset-bot]

🦋 Changeset detected

Latest commit: 53d5c79

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 4 packages

Name	Type
@browserbasehq/stagehand	Patch
@browserbasehq/stagehand-evals	Patch
@browserbasehq/stagehand-server-v3	Patch
@browserbasehq/stagehand-server-v4	Patch

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[cubic-dev-ai]

No issues found across 2 files

Confidence score: 5/5

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

Architecture diagram

sequenceDiagram
    participant AgentProvider as AgentProvider.ts
    participant AI as ai (public export)
    participant AgentTypes as types/public/agent.ts
    participant LogTypes as types/public/logs.ts
    participant ModelTypes as types/public/model.ts

    Note over AgentProvider,ModelTypes: Runtime Import Resolution

    AgentProvider->>AI: Import { ToolSet }
    AgentProvider->>AgentTypes: Import { AgentProviderType }
    AgentProvider->>LogTypes: Import { LogLine }
    AgentProvider->>ModelTypes: Import { ClientOptions }

    Note over AI: Public named export: ToolSet
    AI-->>AgentProvider: Provides ToolSet type

    Note over AgentTypes: Defines AgentProviderType
    AgentTypes-->>AgentProvider: Provides type

    Note over LogTypes: Defines LogLine interface
    LogTypes-->>AgentProvider: Provides type

    Note over ModelTypes: Defines ClientOptions
    ModelTypes-->>AgentProvider: Provides type

    Note over AgentProvider: Uses ToolSet for agent tool definitions

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_{Re-trigger cubic}