Older review threads left partial-frame scheduling, send-lock ownership,
deadline-only stream destruction and cancellation precedence unclear in
both transport tests and source comments.
Document exact sender/parent ordering, name send events explicitly and
explain why stream alignment controls sibling reuse. Clarify private
context controls, overrun relay failure and transport shield boundaries.
Review: PR #481 (goodboy)
https://github.com/goodboy/tractor/pull/481#pullrequestreview-5012942328
(this patch was generated in some part by `opencode` using `gpt-5.6-sol` (`openai`))