Extends the ifc:// URL scheme to address IFC documents hosted on
OpenCDE-compliant Common Data Environments, using document_id= and
version_index= query parameters as the transport signal and version
reference respectively. Adds §9 covering resolver workflow, OAuth2
discovery via Foundation API, caching rules, and federation notes.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
