Recognize sign-in failures for every agent and fall through (#19)

Co-authored-by: Danny Kim <temeddix@gmail.com>
Co-committed-by: Danny Kim <temeddix@gmail.com>

src/runtime.ts

@@ -1,6 +1,6 @@
 import { join } from "jsr:@std/path@1";
 import { parseCredentials } from "./credentials.ts";
-import type { BotProfile } from "./profiles.ts";
+import type { BotProfile, ProfileFailure } from "./profiles.ts";
 
 const FIRST_PROFILE_UID = 20_000;
 
@@ -28,7 +28,7 @@ export type RuntimeOutcome =
     anchorsPath: string;
     profile: Pick<RuntimeProfile, "type" | "model">;
   }
-  | { ok: false };
+  | { ok: false; failures: ProfileFailure[] };
 
 async function writePrivate(
   path: string,