Stable identity
Selection survives layout changes.
Agent interface optimization
Interfaces agents can understand without guessing.
Signal surfaces declare stable identity, capabilities, constraints, and provenance so people and agents operate on the same semantic contract.
A semantic interface is not more metadata. It is a smaller ambiguity surface.
Native semantics
Meaning before pixels.
Every inspectable target has a stable semantic identity and a bounded capability set. The visual layer projects that contract; it does not invent authority.
Bounded capability
Only declared presentation operations are available.
Visible provenance
The interface can explain what produced the current view.
Presentation collaboration
Change the view, not the truth.
A visitor can preview reversible presentation changes and share a versioned proposal while the canonical site remains unchanged.