feat(core-shared): add wireUseCase helper to conformance barrel

Encapsulates withSpan(withCapture(withAudit?(factory(deps)))) composition
and container binding into a single helper, eliminating the structural
boilerplate clone groups repeated across every feature binder pair.

Callers pass { container, symbol, factory, deps, feature, layer, name,
tracer, logger, auditLog? } and get back a fully brand-stacked, container-
bound wired value. Idempotent: unbinds an existing symbol before rebinding.

withAudit lives in core-audit which core-shared cannot import (dependency
inversion: core-audit depends on core-shared). The audit path here replicates
the same semantics — forwarding wrapper + __audited brand — without the
circular dependency.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

packages/core-shared/src/conformance/index.ts

@@ -25,3 +25,5 @@ export {
 } from "./brand-runtime";
 export { ConformanceError } from "./conformance-error";
 export { assertFeatureConformance } from "./assert-bindings";
+export { wireUseCase } from "./wire-use-case";
+export type { WireUseCaseOptions } from "./wire-use-case";