feat(model): fuzzy /model matching

src/agents/model-selection.ts

@@ -179,14 +179,23 @@ export function buildAllowedModelSet(params: {
   }
 
   const allowedKeys = new Set<string>();
+  const configuredProviders = (params.cfg.models?.providers ?? {}) as Record<
+    string,
+    unknown
+  >;
   for (const raw of rawAllowlist) {
     const parsed = parseModelRef(String(raw), params.defaultProvider);
     if (!parsed) continue;
     const key = modelKey(parsed.provider, parsed.model);
+    const providerKey = normalizeProviderId(parsed.provider);
     if (isCliProvider(parsed.provider, params.cfg)) {
       allowedKeys.add(key);
     } else if (catalogKeys.has(key)) {
       allowedKeys.add(key);
+    } else if (configuredProviders[providerKey] != null) {
+      // Explicitly configured providers should be allowlist-able even when
+      // they don't exist in the curated model catalog.
+      allowedKeys.add(key);
     }
   }