docs: add optional TweetClaw source handoff

[kriptoburak]

Summary

• Add an optional OpenClaw agent handoff from SocialCrabs to TweetClaw for building X/Twitter source queues before engagement.
• Keep SocialCrabs responsible for browser engagement pacing and pass only reviewed tweet URLs or handles into actions.

Checks

• git diff --check
• npm view @xquik/tweetclaw version
• curl -I -L --max-time 20 https://github.com/Xquik-dev/tweetclaw