Add agent connections to changelog

[ethanpalm]

Documentation changes

Brief description of what's being updated

Closes

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✅ Technical accuracy

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• Commands and configurations are correct
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• Prerequisites and requirements are accurate

✅ Clarity and completeness

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Note

Low Risk
Low risk documentation-only change that adds a new changelog section and links; no runtime or behavioral impact.

Overview
Adds a new “Agent connections” entry to the May 1, 2026 changelog, describing how to set up third-party integrations via the Slack agent and noting Composio as the underlying integration catalog, with links to relevant docs.

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