docs: add TweetClaw source context

[kriptoburak]

Summary

• Add optional TweetClaw/OpenClaw X/Twitter source-context guidance to the main README and skill docs.
• Keep Citedy responsible for trend scouting, article generation, social adaptation, publishing, scheduling, webhooks, and analytics.
• Keep TweetClaw write-like actions inside the TweetClaw/OpenClaw approval flow.
• Update the root, OpenClaw, and standalone focused skill copies together to avoid packaged-skill drift.

Validation

• Duplicate checks: local TweetClaw audit/archive, target files, GitHub code search, and open/closed PRs/issues found no prior TweetClaw or Xquik submission for this repo.
• Target checks: MIT license, fork parent verified as citedy/citedy-seo-agent.
• Ran git diff --check.
• Ran npm pack --dry-run --json and confirmed the changed README and skill files are included.
• Checked the new TweetClaw GitHub link and confirmed the OpenClaw install command appears in the changed docs.
• Link sweep found only pre-existing target placeholder/API-root links unrelated to this PR.
• Public-safety scan found no secrets or private implementation details in the added text.

Existing Target Drift

• node autogpt/validate-templates.mjs currently reports pre-existing manifest count drift, missing AutoGPT template manifest entries, and duplicate action endpoint declarations. I left that unchanged because this PR only updates docs guidance.

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