Fixes #23140

Root cause

extensions/whatsapp/src/channel.ts sendMedia was not destructuring
or forwarding mediaLocalRoots from the outbound context, so the media
validation function received undefined roots and fell back to defaults
that excluded the agent workspace — throwing LocalMediaAccessError.

Fix

Add mediaLocalRoots to the parameter destructure and forward it to
sendMessageWhatsApp, matching the correct implementation in
src/channels/plugins/outbound/whatsapp.ts.

Tests

Added extensions/whatsapp/src/channel.outbound.test.ts with a
regression test verifying mediaLocalRoots is forwarded on the
sendMedia adapter path.

Greptile Summary

Fixed extensions/whatsapp/src/channel.ts sendMedia to forward mediaLocalRoots parameter to sendMessageWhatsApp, matching the correct implementation in src/channels/plugins/outbound/whatsapp.ts. Without this parameter, the media validation function received undefined roots and fell back to defaults that excluded the agent workspace, throwing LocalMediaAccessError. Added regression test to verify the parameter is properly forwarded.

Confidence Score: 5/5

• This PR is safe to merge with minimal risk
• The fix is a straightforward parameter forwarding issue with clear root cause analysis. The change correctly adds the missing mediaLocalRoots parameter to both the destructure and the forwarding call, matching the reference implementation. The regression test thoroughly validates the fix by checking both cases (with and without mediaLocalRoots). The code follows existing patterns and is type-safe.
• No files require special attention

_{Last reviewed commit: 34143a0}

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