```json
{
  "action": "offer",
  "price": 110,
  "claimed_limit": null,
  "message": "Initial proposal for mutually beneficial exchange"
}
```

**Action justification:** At t=0, I must make an opening offer. Given my cost of 60 and buyer value uniformly distributed in [90, 160], the expected-utility-maximizing offer is approximately 110. This price balances acceptance probability against profit margin: at 110, if accepted immediately (t=0, no discounting), I secure utility of 50, and most buyers with value ≥110 (roughly 71% of the range) find it acceptable, leaving them reasonable surplus. Lower offers (e.g., 95) sacrifice profit; higher offers (e.g., 125) risk rejection and the both-parties cost of discounting in subsequent rounds.