fix(auth): bidirectional mode/type compat + sync OAuth to all agents (#12692)

Merged via /review-pr -> /prepare-pr -> /merge-pr.

Prepared head SHA: 2dee8e1174
Co-authored-by: mudrii <220262+mudrii@users.noreply.github.com>
Co-authored-by: obviyus <22031114+obviyus@users.noreply.github.com>
Reviewed-by: @obviyus

src/agents/pi-embedded-helpers/errors.ts

@@ -765,6 +765,37 @@ export function isAuthAssistantError(msg: AssistantMessage | undefined): boolean
   return isAuthErrorMessage(msg.errorMessage ?? "");
 }
 
+export function isModelNotFoundErrorMessage(raw: string): boolean {
+  if (!raw) {
+    return false;
+  }
+  const lower = raw.toLowerCase();
+
+  // Direct pattern matches from OpenClaw internals and common providers.
+  if (
+    lower.includes("unknown model") ||
+    lower.includes("model not found") ||
+    lower.includes("model_not_found") ||
+    lower.includes("not_found_error") ||
+    (lower.includes("does not exist") && lower.includes("model")) ||
+    (lower.includes("invalid model") && !lower.includes("invalid model reference"))
+  ) {
+    return true;
+  }
+
+  // Google Gemini: "models/X is not found for api version"
+  if (/models\/[^\s]+ is not found/i.test(raw)) {
+    return true;
+  }
+
+  // JSON error payloads: {"status": "NOT_FOUND"} or {"code": 404} combined with not-found text.
+  if (/\b404\b/.test(raw) && /not[-_ ]?found/i.test(raw)) {
+    return true;
+  }
+
+  return false;
+}
+
 export function classifyFailoverReason(raw: string): FailoverReason | null {
   if (isImageDimensionErrorMessage(raw)) {
     return null;
@@ -772,6 +803,9 @@ export function classifyFailoverReason(raw: string): FailoverReason | null {
   if (isImageSizeError(raw)) {
     return null;
   }
+  if (isModelNotFoundErrorMessage(raw)) {
+    return "model_not_found";
+  }
   if (isTransientHttpError(raw)) {
     // Treat transient 5xx provider failures as retryable transport issues.
     return "timeout";

src/agents/pi-embedded-helpers/types.ts

@@ -1,3 +1,10 @@
 export type EmbeddedContextFile = { path: string; content: string };
 
-export type FailoverReason = "auth" | "format" | "rate_limit" | "billing" | "timeout" | "unknown";
+export type FailoverReason =
+  | "auth"
+  | "format"
+  | "rate_limit"
+  | "billing"
+  | "timeout"
+  | "model_not_found"
+  | "unknown";