[docs] add aisdk workaround before npm release + add versions to work with LanguageModelV1 + LiteLLM works for python

[chrisreadsf]

why

1. aisdk not yet available through npm package
2. customLLM provider only works with LanguageModelV1
3. LiteLLM compatible providers are supported in python

what changed

1. change docs to install stagehand from git repo
2. pin versions that use LanguageModelV1

test plan

local test

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Latest commit: 6c20f60

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[greptile-apps]

Greptile Summary

This PR addresses two important issues: the AI SDK not being available through the npm package and the need for specific version pinning for LanguageModelV1 compatibility.

Key Changes:

• Updated installation instructions to pin ai@4 and provider packages to version 1 for LanguageModelV1 compatibility
• Added workaround documentation for installing Stagehand from git repository to access AISdkClient
• Improved clarity around version requirements and compatibility
• Added temporary @ts-ignore for the AISdkClient import until proper types are available

Confidence score: 4/5

• This PR is safe to merge with minimal risk
• The changes are documentation-only updates that provide necessary workarounds for current limitations. The version pinning is appropriate for compatibility, and the git installation workaround is clearly documented as temporary.
• No files require special attention - this is a straightforward documentation update

_{1 file reviewed, 1 comment}

_{Edit Code Review Bot Settings | Greptile}

[greptile-apps]

style: Using @ts-ignore should be avoided when possible. Consider using a more specific TypeScript suppression or adding proper type declarations.

Suggested change

	// @ts-ignore
	import { AISdkClient } from "@browserbasehq/stagehand";
	// TODO: Remove this when AISdkClient is properly exported with types
	import { AISdkClient } from "@browserbasehq/stagehand";