docs: Link send_message status issue

[stickerdaniel]

Summary

• Link open send_message bug [BUG] send_message can over-confirm sends and miss share-info prompt #573 in the README Features & Tool Status table
• Keep the status table aligned with the open tool-specific limitation list

Closes #576

Synthetic prompt

Update the README Features & Tool Status table so the send_message row links open tool-specific issue #573 alongside the existing linked send_message issues. Create a docs issue for the mismatch and make the PR close it.

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[stickerdaniel]

• docs: Link send_message status issue #577 👈 (View in Graphite)
• main

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[greptile-apps]

Greptile Summary

This PR updates the README tool status table.

• Adds issue #573 to the send_message status links.
• Keeps the new link in the same format as the existing status-table issue links.

Confidence Score: 5/5

This looks safe to merge.

• No blocking issues found in the changed code.

Important Files Changed

Filename	Overview
README.md	Adds one issue link to the send_message row in the Features & Tool Status table.

_{Reviews (1): Last reviewed commit: "docs: Link send_message status issue" | Re-trigger Greptile}