Method, Pass, Channel and FrontEnd, and one registry the planner, the run,
the compile, the conversions and the verdict go through. Every built-in
registers through the same trait a host's own implements: the twelve
methods and the pulse simulator, the eight passes, the five channels and
the three formats. Registry::with_builtins() and register(...) are
explicit and stay in the process.
The engine checks what a registered component gives: a method's class and
the members the engine writes, a pass's output against its input on the
whole circuit by the ladder or a distance bound, a channel's Kraus
operators completely positive and trace preserving at each job's values,
a format's program reading. A result a registered component took part in
carries `components`, each identity (name, version, descriptor digest)
marked registered and certified false, sealed by its receipt; a result of
built-ins alone gives the bytes it gave, the eight pinned job digests
holding through any registry. Refusal codes J060 to J065. The example
examples/extension_points.rs, docs/extension-points.md, and the CI leg
wai-quantum-registry.yml.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
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