fix: make zod a peerDependency to dedupe installed versions

[ianduvall]

Summary

Moves zod to be a peer dependency as suggested by the zod maintainer

Test plan

TBD

• One idea is we publish an experimental release and then use that in a sandbox with the failing test cases to validate the fix is working as expected.

Issue number

Closes #187

Checks

• I've added new tests (if relevant)
• I've added/updated the relevant documentation
• I've run pnpm test and pnpm test:examples
  • (If you made a major change) I've run pnpm test:integration (see details)
• I've made sure tests pass
• I've added a changeset using pnpm changeset to indicate my changes

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[ianduvall]

@seratch tagging you for review

[seratch]

@ianduvall Thanks for sending this PR! I don't have the bandwidth to carefully check this issue right now, but will start working on this soon.

[pungoyal]

@ianduvall you should be changing the relevant readme files as well?

[dcsan]

@ianduvall this seems to have some conflicts now

how would this be used? npm install @openai/agents
and then separately install zod?

would that allow different submodules to still use higher versions if they specify as a peer-dep?

[ianduvall]

how would this be used? npm install @openai/agents and then separately install zod?

Yep

would that allow different submodules to still use higher versions if they specify as a peer-dep?

You would need to stay within the supported version range. A follow up to this PR would be to add support for Zod v4.

[ianduvall]

@ianduvall you should be changing the relevant readme files as well?

I'll leave that for the end to avoid conflicts

[seratch]

@ianduvall Thanks for working on this. I found that this PR needs an additional commit, so I come up with #342 including your contributions.