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[Backend] Add unified backend resolution policy (#2318)

* Refactor backend module registration

* Define backends with explicit specs

* Require explicit backend for codegen

* Rename backend spec to backend module

* Keep host codegen on selected backend

* Introduce backend context for compilation

* Remove legacy backend compatibility APIs

* Restore backend API docstrings

Chaofan Lin committed 1mo ago

fef9f760920fa5e81596e08696ee3c6e8e1c18ce

Parent: 752043e

Committed by GitHub <noreply@github.com> on 8/5/2026, 6:41:57 PM