update changelog and docs from OCS PR #3291

Author: github-actions[bot]

docs/changelog.md

@@ -4,6 +4,9 @@ hide:
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 # Changelog
+## May 5, 2026
+* **CHANGE** Increased the HTTP request size limit from 512 KB to 1 MB and the response size limit from 1 MB to 5 MB for the restricted HTTP client used in pipelines.
+
 ## Apr 30, 2026
 * **NEW** Added **Email** as a messaging channel. Users can now communicate with chatbots via email — inbound messages are received through a webhook, routed to the correct chatbot, and replied to in a threaded email conversation. This feature is gated behind the `flag_email_channel` feature flag.
 * **NEW** The email channel now supports **bidirectional file attachments**. Inbound attachments (PDFs, CSVs, images, etc.) are saved and made available to the LLM or pipeline; oversized or blocked file types are surfaced as inline notes so the bot can explain the rejection. Outbound files produced by the pipeline (e.g. via `add_file_attachment()` in a Python node) are sent as MIME attachments in the same threaded reply.