docs: add OpenClaw X fallback note

[kriptoburak]

Summary:

• Document TweetClaw as an optional OpenClaw companion when exa-x-search coverage is too sparse for X/Twitter-specific reads or approved writes.
• Keep Exa responsible for semantic web search and source discovery.

Validation:

• python3 tests/smoke.py --no-live
• git diff --check
• Added-line public hygiene scan
• npx --yes markdown-link-check README.md INSTALL.md exa-x-search/SKILL.md --quiet reported only the pre-existing https://dashboard.exa.ai/api-keys 429 in target docs; this PR adds no new links.

[gemini-code-assist]

Code Review

This pull request updates the SKILL.md documentation to introduce the OpenClaw companion option, recommending the installation of TweetClaw for specialized X/Twitter workflows. The reviewer suggested removing the pinned version (@1.6.31) from the installation command to ensure users install the latest stable release and prevent the documentation from becoming outdated.

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[chatgpt-codex-connector]

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[kriptoburak]

The current head uses the unpinned npm:@xquik/tweetclaw install form. This avoids freezing a stale package version while following the repository's durable install convention.