pr4xis-runtime — load a .prx ontology as data, interpret it

The data-driven half of the North Star "praxis = .prx files + a runtime". Where pr4xis is the COMPILE-TIME ontology model (the ontology! macro and the Category / Functor / FreeCategory traits) and pr4xis-domains holds the compiled-in ontologies, this crate is the RUNTIME: it loads a .prx — the serialized ontology — as DATA and interprets it, without the ontology being compiled in.

The load/store cycle is the free ⊣ forgetful adjunction

• A .prx is a free-category presentation: generators + relations + connections-as-action-on-generators — open-world-generic by construction.
• Load deserializes the bytes into that free form — always possible, no compiled types required.
• Rebind uses each connection's serialized action-on-generators as the interpretation a FreeExtension needs to map the free generators into a closed-world Category: partially (unknown generators stay free — graceful open-world) and faithfully (a generator rebinds to a concept only when their content addresses agree).

The runtime grounds only the hash

Everything the runtime knows about the .prx FORMAT it learns from the meta-.prx (the ontology that defines the format). The one thing it cannot learn by reference — because it is what reference MEANS — is the content-address primitive ([address]). Identity bottoms out there.

Status

Scaffolding the runtime kernel. First primitive: [address] (the hash ground). The loader (bytes → free category), the rebind (FreeExtension → closed world), the canonical codec, and the meta-.prx interpreter land on top of it, per the consolidated build spine.