bug(run-local): MAX_ADVANCES guard exhausted silently returns outcome "running"

[Sertug17]

Summary

runLocal has a MAX_ADVANCES = 1000 guard against infinite loops, but when the limit is hit the function silently returns outcome: "running". The caller cannot distinguish "hit the safety limit" from "execution genuinely still in flight".

Root Cause

packages/agent-core/src/local/run-local.ts:

const MAX_ADVANCES = 1000;
let guard = 0;
while (guard++ < MAX_ADVANCES) {
  await core.advance(executionId, max);
  // ...
}
// If limit exhausted → falls through, final.status is still "running"
const outcome = final?.status ?? "running"; // → "running" with no indication why

Fix

Return a distinct outcome (or add a stubWarning) when the guard fires:

let limitExceeded = false;
while (guard++ < MAX_ADVANCES) { ... }
if (guard > MAX_ADVANCES) limitExceeded = true;

// expose in result:
unusedStubs // or add a top-level limitExceeded: boolean field

At minimum, document that outcome: "running" can mean "advance limit reached".