Machine-readable portfolio discovery layer is live

The public portfolio was upgraded so search engines, answer engines, recruiting tools and software agents can consume the same sanitized professional evidence in formats designed for machines as well as people. The release includes dynamic page metadata, Schema.org knowledge-graph markup, accurate sitemap modification dates, llms.txt and Markdown versions, explicit AI crawler rules, a versioned public JSON API, Atom and JSON feeds, a read-only MCP endpoint and an A2A agent card. Private infrastructure, credentials, customer-identifying data and proprietary implementation details remain excluded.