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Cost-Split Multi-Model Routing — make Haiku, Sonnet, and Opus do their actual jobs across one cron pipeline

Pick one Cortex or AIOS cron pipeline that currently calls Opus 4.7 on every step and refactor it to cost-split routing — Haiku 4.5 or Sonnet 4.6 for routine sub-steps, Opus 4.7 only on escalation, advisory, or synthesis steps. Use the existing `ops/scripts/model_router.py` infrastructure. Measure the before/after token spend, the failure rate, and the latency. Ship a routing primitive other pipelines can adopt without re-asking.

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