Agents: infer auth-profile unavailable failover reason

src/agents/model-fallback.ts

@@ -3,6 +3,7 @@ import {
   ensureAuthProfileStore,
   getSoonestCooldownExpiry,
   isProfileInCooldown,
+  resolveProfilesUnavailableReason,
   resolveAuthProfileOrder,
 } from "./auth-profiles.js";
 import { DEFAULT_MODEL, DEFAULT_PROVIDER } from "./defaults.js";
@@ -342,12 +343,18 @@ export async function runWithModelFallback<T>(params: {
           profileIds,
         });
         if (!shouldProbe) {
+          const inferredReason =
+            resolveProfilesUnavailableReason({
+              store: authStore,
+              profileIds,
+              now,
+            }) ?? "rate_limit";
           // Skip without attempting
           attempts.push({
             provider: candidate.provider,
             model: candidate.model,
             error: `Provider ${candidate.provider} is in cooldown (all profiles unavailable)`,
-            reason: "rate_limit",
+            reason: inferredReason,
           });
           continue;
         }