feat(skill): add relayshield-security identity threat intelligence

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What this adds

A new relayshield-security skill covering the full RelayShield identity threat intelligence API. Agents load this skill when they need to:

• Check email addresses against 13B+ breach records
• Detect SIM swap / eSIM attacks via live carrier data
• Scan for typosquat and phishing domains impersonating a brand
• Audit OAuth-connected SaaS app breach exposure
• Detect infostealer malware compromise — near real-time identification of device infections by credential-harvesting trojans (RedLine, Raccoon, Vidar) that exfiltrate all browser-saved passwords, session cookies, and crypto wallet keys
• Assess EVM wallet risk — blacklists, phishing associations, contract flags
• Scan URLs and files for malware across 70+ engines

Payment

Supports both payment modes:

• x402 PAYG — USDC on Base (chain 8453), same protocol Venice uses for wallet credits
• RapidAPI subscription — with a free tier for development

Skill structure

Follows CONTRIBUTING.md conventions: frontmatter, endpoint table with costs, auth section covering both x402 and RapidAPI paths, curl quick-start for all major endpoints with sample responses, full parameter reference, error table, and gotchas section.

Live API

• RapidAPI: rapidapi.com/relayshielduser/api/relayshield-security-intelligence
• MCP server: relayshield-mcp on PyPI

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Hi team 👋 Checking in on this PR — happy to revise anything to fit your conventions better. The RelayShield API is live and the skill follows the CONTRIBUTING.md structure. Let me know if there's anything you need from me to move this forward.