[CryptoGnome]

Summary

• remove the invalid redundant GitHub deploy workflow; Cloudflare Workers Builds remains the production deploy path
• declare the supported Node/npm versions and add .nvmrc
• tighten README safety wording and local setup instructions

Verification

• npm ci
• npm run validate (51 hooks)
• npm run build (76 pages)
• git diff --check
• current main validate workflow is green, including forge build and forge test
• current main Cloudflare Workers Builds check is green

Risk

Low. Removes a duplicate deployment path that never started a job; deployment continues through the existing Cloudflare Workers Builds integration.