Add CSV SafeCheck affiliate program

[ReconcileKit]

Summary

Adds CSV SafeCheck, a browser-local Shopify product CSV preflight tool, and its public Lemon Squeezy affiliate program.

Sources

• Program terms and signup: https://csv-safecheck.pages.dev/affiliates
• Public affiliate endpoint: https://csv-safecheck.lemonsqueezy.com/affiliates
• Lemon Squeezy affiliate payout methods and timing: https://docs.lemonsqueezy.com/help/affiliates/payouts

Verification

• npm run registry:build — passed
• npm run verify:changed — confirmed_affiliate, score 15
• Confirmed no existing CSV SafeCheck listing, issue, or PR before submission

The listing remains verified: false for maintainer review.

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