[afourniernv]

Parked for now. Agent Router uses Route plus the translation helpers, so this API is outside the initial Go-binding stack.

What

Add Router.Decide as a thin Go wrapper around the C bridge's sy_decide_new. Hosts pass provider JSON and receive the normalized routing outcome plus ordered, provider-shaped candidate requests.

Rust handles decoding, candidate preparation, and reply decoding. Go keeps callback execution, cancellation, and cleanup. Typed decision calls keep their existing protocol.

Why

Go gateways should not assemble the codec sequence themselves. This uses the shared C implementation rather than keeping a separate Go implementation of that sequence.

How tested

• Native tests on Go 1.22.12 and the current local toolchain, with race detection and GOEXPERIMENT=cgocheck2.
• Fresh native library and WASM guest builds; both backend suites passed, including race tests and vet.
• OSS Agent Router spike: four focused tests, the full processor package tests, and vet passed with cgo disabled and a localhost mock judge.
• Rust workspace tests, strict Clippy, formatting, Ruff, and 198 hermetic Python tests passed.

No live provider calls or actual Envoy/Enterprise deployment.

Notes for reviewers

Its original base is preserved on codex/go-decide-parked-base, including the C support from #1156. The full implementation, including WASM integration, is preserved on codex/go-decide-parked-full-stack. Neither draft blocks the active Go-binding stack.

Adds one Go method and five supporting types. Existing public Go types and Route are unchanged. No additional C exports or dependency changes in this PR; build the matching C library.

Outcomes retain the normalized request, optional answer, and evidence. Algorithm-produced answers remain normalized. Candidate requests are prepared eagerly. Preparation errors end the run, while ordinary host errors follow the algorithm's policy.

[afourniernv]

Closing for now since Agent Router uses Route and the translation helpers. Keeping the branch so we can reopen if a caller needs Decide.