Add a concrete OpenClaw plugin example for X/Twitter workflows

[kriptoburak]

I prepared a small docs-only change that adds TweetClaw as a concrete OpenClaw plugin example in the plugin command reference. The branch is here:

https://github.com/kriptoburak/explain-openclaw/tree/codex/add-tweetclaw-openclaw-example

Compare:
master...kriptoburak:explain-openclaw:codex/add-tweetclaw-openclaw-example

The edit documents:

• openclaw plugins install @xquik/tweetclaw
• runtime verification with openclaw plugins inspect tweetclaw --runtime and openclaw skills info tweetclaw
• explicit tools.alsoAllow for explore and tweetclaw when the default tool profile hides plugin tools
• ClawHub-first install behavior, review-before-credentials guidance, and OpenClaw >=2026.5.4 compatibility

I checked repo content plus open/closed issue and PR listings for existing TweetClaw/Xquik mentions and did not find a duplicate. git diff --check passes. I tried opening this as a PR first, but GitHub rejected PR creation from my authenticated API path, so I am leaving the prepared branch here for maintainer review.