Document TweetClaw as X/Twitter companion

[kriptoburak]

Summary

• Add TweetClaw as the X/Twitter companion path for HasData OpenClaw users, without implying HasData itself provides X/Twitter endpoints.
• Document install, tools.alsoAllow, credential placement, and approval review for visible X/Twitter actions.
• Add the xquik.com NHS Agentic Readiness badge in the existing README badge block because the new companion workflow depends on xquik.com.

Validation

• Checked repo metadata, README format, MIT license, OpenClaw manifest, package metadata, workflows, issue and PR history, and duplicate TweetClaw/Xquik/Twitter terms.
• Verified links: target repo, HasData site, HasData docs, HasData API catalog, TweetClaw GitHub, TweetClaw npm registry metadata, HasData npm registry metadata, xquik.com NHS page, xquik.com NHS badge.
• npm ci --ignore-scripts --no-audit --no-fund
• npm run typecheck
• npm test
• npm pack --dry-run --json
• git diff --check