docs: add changelog entry for ctx.exports support in vitest-pool-workers

[petebacondarwin]

Summary

Adds a changelog entry announcing the new ctx.exports support in @cloudflare/vitest-pool-workers, corresponding to cloudflare/workers-sdk#11533.

The changelog entry explains that the Vitest integration now supports the ctx.exports API, with a note about the additionalExports configuration option for cases where exports cannot be automatically inferred (e.g., wildcard re-exports from virtual modules).

Updates since last revision

• Added two code examples demonstrating how to access exports in tests:
  • Using createExecutionContext() from cloudflare:test
  • Importing exports directly from cloudflare:workers

Human review checklist

• Verify the code examples are syntactically correct TypeScript
• Verify the links to the vitest integration docs, ctx.exports API docs, and context-exports fixture are correct

Documentation checklist

• Is there a changelog entry (guidelines)? This PR is the changelog entry.
• The change adheres to the documentation style guide.
• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes. N/A - this is a changelog entry only.
• Files which have changed name or location have been allocated redirects. N/A - new file only.

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Link to Devin run: https://app.devin.ai/sessions/bf9a620152464392aa5c621e03a562c0
Requested by: @petebacondarwin

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[github-actions]

This pull request requires reviews from CODEOWNERS as it changes files that match the following patterns:

Pattern	Owners
/src/content/changelog/	@cloudflare/pm-changelogs, @cloudflare/pcx-technical-writing

[github-actions]

Preview URL: https://813dc3ff.preview.developers.cloudflare.com
Preview Branch URL: https://devin-1766406353-vitest-ctx-exports-changelog.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/changelog/2025-12-16-vitest-ctx-exports-support/	https://devin-1766406353-vitest-ctx-exports-changelog.preview.developers.cloudflare.com/changelog/2025-12-16-vitest-ctx-exports-support/