Problem

When a cron job uses delivery.mode = "announce" without an explicit to recipient (relying on last-session target resolution via channel: "last"), delivery never triggers.

Current Behavior

The delivery logic requires an explicit to field to request delivery. Jobs configured like this won't deliver:

job.delivery = { mode: "announce", channel: "last" }  // no "to", expects last-session resolution

Root Cause

There's a resolveCronDeliveryPlan() function in src/cron/delivery.ts that correctly handles this:

if (hasDelivery) {
  return {
    requested: resolvedMode === "announce",  // true regardless of "to"
    ...
  };
}

However, this function was added but never integrated into the execution path. It's dead code.

Proposed Solution

Wire up resolveCronDeliveryPlan() into the cron isolated agent runner, or extract its logic into the wrapper.

Notes

All existing tests use announce mode with explicit to, so this scenario was never covered.