docs: add Hermes Tweet tool integration

[kriptoburak]

Summary

• add Hermes Tweet to the Social tool registry
• add a tool-only integration guide for Hermes Agent X/Twitter workflows
• document read/action gating with XQUIK_API_KEY and HERMES_TWEET_ENABLE_ACTIONS

Files changed

• tools/REGISTRY.md
• tools/integrations/hermes-tweet.md

Validation

• bash validate-skills.sh
• git diff --check
• added-line hygiene check for punctuation and sensitive wording
• secret-like literal scan on changed files
• link check for the new dashboard URL: HTTP 200

Context

This follows the current v2.0 tool-only integration shape rather than adding a new marketing skill.

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