Release public-ready 0.1.18

Public-ready release 0.1.18

• Externalizes simulation secrets and adds scan-secrets
• Fixes package references and human-readable CLI help
• Makes strict query relevance the default with --include-unrelated escape hatch
• Adds passphrase-derived encrypted keyring support
• Accepts doctor status 0 or 1 in release audit

Cloudflare Pages deployed to https://enigmamemory.com/.
npm package published: https://www.npmjs.com/package/enigma-memory/v/0.1.18

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