Add X source context guidance

[kriptoburak]

Summary

• add guidance for grounding X drafts with source context before creating a Typefully draft
• mention TweetClaw as an optional read-only OpenClaw source packet when the user already has it available
• keep Typefully responsible for draft creation, scheduling, publishing, comments, analytics, queues, and social-set selection
• update the skill freshness date and changelog

Validation

• git diff whitespace check
• added-line public wording and dash hygiene scan
• markdown-link-check on README, SKILL, and changelog
• npm clean install with scripts, audit, and funding disabled
• npm test

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