Source prose left the stalled transport peer ambiguous, omitted why a
local namespace pointer retains its object and described cancellation
as interrupting a frame write which is now shielded.
Identify remote-peer and bounded-cancel behavior, document process-local
pointer caching, and explain the shield completion checkpoint which
makes startup cancellation protocol-safe on a connected channel.
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`))