Add X/Twitter trend source prompt

[kriptoburak]

Summary

• Add X/Twitter as a first-class trend-analysis source alongside TikTok, Reddit, App Store, and Web Search.
• Add a structured prompt for public X/Twitter conversations that separates buyer demand from viral noise.
• Mention optional TweetClaw/OpenClaw exports only as user-approved source evidence, not as agent instructions or required setup.

Validation

• git diff --check
• npx --yes markdown-link-check README.md skills/trend-analysis/SKILL.md skills/trend-analysis/prompts/x-twitter.md --quiet
• Ruby wiring check for the new prompt reference and TweetClaw evidence boundary
• Duplicate gate: target content, open/closed PRs, and open/closed issues had no TweetClaw, Xquik, x-twitter-scraper, or OpenClaw entry
• Public-hygiene scan of the changed diff for secrets, private implementation details, unsupported claims, and internal cost mechanics