docs: document undici dependency fix in CHANGELOG

[webdevtodayjason]

Summary

This PR documents the undici dependency fix in the CHANGELOG under the "Unreleased" section.

Background

Issue #23 reported that clawdhub v0.3.0 fails with ERR_MODULE_NOT_FOUND for the undici package when installed from npm.

What happened

• The fix (adding undici to package.json) was already committed to the main branch
• However, v0.3.0 was published to npm before this fix was committed
• The fix was not documented in the CHANGELOG

This PR

• ✅ Adds a CHANGELOG entry documenting that the undici dependency has been added
• ✅ References issue Missing undici dependency causes ERR_MODULE_NOT_FOUND on Node.js #23 for tracking
• ✅ Prepares the CHANGELOG for the next patch release (v0.3.1)

Impact

This ensures users understand the fix will be available in the next npm release and maintainers have proper release notes when publishing v0.3.1.

Fixes #23

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Co-Authored-By: Warp agent@warp.dev

[vercel]

@webdevtodayjason is attempting to deploy a commit to the Amantus Machina Team on Vercel.

A member of the Team first needs to authorize it.

[steipete]

Closing as superseded/stale.\n\n is already present in and has shipped since (also in ). This PR now only adds a historical changelog bullet and is out of date against current .\n\nIf we still want extra historical wording, we can add it in a fresh tiny PR on top of current .

[steipete]

Correction to previous note (formatting issue):

Closing as superseded/stale.

• undici is already present in packages/clawdhub/package.json.
• It has shipped since v0.3.1-beta.1 (and in v0.4.0+).
• This PR now only adds a historical changelog bullet and is out of date against current CHANGELOG.md.

If we still want that historical wording, we can do a fresh tiny PR on top of current main.