Implement the accepted IFC profile representation and admission

[Brad-Edwards]

Align published IFC profiles and their execution support with the accepted expressiveness decision.

Acceptance criteria

• Implement the selected profile representation, source/sink resolution, profile publication, and capability admission. Add authoring/configuration surfaces only where the accepted decision requires them.
• Preserve owner-specific distinctions where supported and reject requirements the selected profile cannot represent or realize. Keep confidentiality, integrity, release authority, and provenance separate.
• Integrate profile obligations and admitted support strength with the revised API-424 contracts; no silent profile substitution or runtime weakening.
• Update schemas, governed publication records, migrations, and support documentation. Verify the accepted owner-qualified cases and rejection of unsupported distinctions.

Prerequisites: #1354, #1365.

References: Diagnosis.