docs: add TweetClaw skill UX example

[kriptoburak]

Summary

• Add TweetClaw as a concrete external OpenClaw plugin example in the skills UX overview.
• Capture the install path, package source, ClawHub discovery link, readiness checks, and user workflows that exercise both per-agent access and gateway setup scope.

Testing

• npm ci --ignore-scripts
• git diff --check
• npm run typecheck
• npm view @xquik/tweetclaw version --silent
• npm run lint

npm run lint currently fails on unrelated pre-existing issues in server/install-context.js, src/features/agents/components/AgentChatPanel.tsx, src/features/agents/components/GatewayConnectScreen.tsx, and src/features/agents/operations/useRuntimeSyncController.ts.

Link check: GitHub and ClawHub returned 200. The npm website returned 403 to the Node fetch bot check, so I verified the package through npm view @xquik/tweetclaw version --silent instead.

AI-assisted

• AI-assisted: Codex prepared this docs-only change and ran the checks above.

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