yamiru.com v4.6 - Alpha/beta AI SEO stack: NLWeb, MCP discovery, agents.json

Experimental AI SEO layer deployed: NLWeb natural-language ask endpoint (/ai/ask, alpha), MCP discovery manifest (draft), agents.json flows (alpha), trust.txt entity signals, Markdown content negotiation, HTTP 103 Early Hints preload, ProfessionalService schema with GeoCoordinates for local SEO, plus Content Signals Policy and RSL machine-readable licensing.