chore(meds): drop a forwarder and a reserved-code branch the audit flagged

Removes the 402 / 423 spare-code branch in the natural-language
extractor; the route surfaces budget exhaustion through the standard
error envelope, so the inline comment was an unused shim. The
recapCadence single-call wrapper was already retired alongside the
empty day-detail step.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/components/medications/scheduling/NaturalLanguageExtractor.tsx

@@ -157,13 +157,6 @@ export function NaturalLanguageExtractor({
         setError({ kind: "noProvider" });
         return;
       }
-      if (res.status === 402 || res.status === 423) {
-        // Reserved spare codes — keep the budget branch wired even
-        // though the route currently surfaces budget exhaustion via
-        // the apiHandler's HttpError pipeline.
-        setError({ kind: "budget" });
-        return;
-      }
       if (!res.ok) {
         const body = (await res.json().catch(() => null)) as {
           error?: string;