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Cian Johnston
843754a547
Follow-up to #26862 ("remove direct chat routing"), which collapsed the routing discriminated union into a single `aiGatewayModelRoute` but left a one-path dispatch shim behind in `model_routing.go`. Removes `resolveModelRouteForConfig`/`resolveModelRouteForProviderType`/`newModel` wrapper functions that did nothing but call their `*AIGateway*` counterparts, and renames the `*AIGateway*` targets to take over those names directly. Also collapses a redundant if/else in `title_override.go` where both branches called the same function with the same effective argument, and has `chatutil.NormalizedStringPointer` delegate to the existing `coderd/util/strings.EmptyToNil` instead of reimplementing empty-string-to-nil logic. No behavior change. <details> <summary>Investigation notes / decision log</summary> Two independent read-only investigations were run over `coderd/x/chatd` looking for cleanup opportunities following #26862: one focused on residue from that PR specifically, one a general over-engineering pass on the whole package. Both independently converged on the `model_routing.go` shim as the top finding (verified zero divergent call sites). Other candidates considered and explicitly deferred/rejected for this PR: - Renaming away the vestigial `AIGateway` prefix package-wide: cosmetic-only, touches many call sites, skipped. - Inlining the `chatcost` subpackage into `chatd`: unrelated to #26862, skipped. - Deleting the deprecated `AIGatewayRoutingEnabled` deployment flag: confirmed dead/no-op, but intentionally kept as a back-compat shim per #26862; removal should follow the same deprecation cadence as other deprecated deployment options, as a separate, differently-timed change. - Folding `chatutil` entirely into `chatprovider`/`chatopenai`: `NormalizedStringPointer` overlapped with `coderd/util/strings.EmptyToNil` (now reused), but `NormalizedEnumValue` has no equivalent elsewhere in the repo and still has 2 real call sites, so the package stays. </details> --- Generated by Coder Agents on behalf of @johnstcn.