Distillation

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<observations> Date: Aug 4, 2026 * 🟡 (21:33) User instructed scheduled follow-up: check CI for PR #21336, focus on backend typing + backend test shards (0-6), use gh api to inspect failed job logs filtered for FAIL/ERROR/error * 🟡 (21:34) CI status check for PR #21336 (run 30952302519): backend typing=fail (1m55s), backend test shards 0-6=pending. Job 92137133087 (typing), 92137295252/92137295373/92137295091/92137295111/92137295184/92137295092/92137295174 (tests) * 🟡 (21:37) mypy error in test_orbital.py:46: `error: Missing positional argument "sender" in call to "send_robust" of "Signal" [call-arg]`. 1 error in 1 file (checked 2154 source files). CI run also showed DEP0169 `url.parse()` deprecation warning (unrelated, pre-existing) * 🟡 (21:37) Assistant diagnosing fix: add `sender` argument to `event_accepted.send_robust(...)