Return the transport-independent document hashed by a runtime-layer tag.
The bundle release tag and its asset URLs are derived from the digest, so
including them would make the identity circular. External transport records,
asset names, bytes, digests, and every semantic descriptor field remain in
the document. The public descriptor is therefore a deterministic envelope
around this closed identity rather than an input to its own hash.
Return the transport-independent document hashed by a runtime-layer tag.
The bundle release tag and its asset URLs are derived from the digest, so including them would make the identity circular. External transport records, asset names, bytes, digests, and every semantic descriptor field remain in the document. The public descriptor is therefore a deterministic envelope around this closed identity rather than an input to its own hash.